I ordered a ADATA 8GB MicroSDHC Class 10 memory card for my HTC HD2. I'd like to know if it will work well on my phone since the transfer is so high. I'm asking this because I want to use a SD version on android.
Thank you in advance for the answer!
When i asked my friend who was the Sales Director of Sandisk Australiasia, he said that the read and write speeds of the supplied Class 2 was more than enough, since these Class 2 is the minimum guaranteed write speeds for that card.
Personally, i'd like to use a faster card, but i think that the key here is the quality of the card over the speed. Im using android over SD and dont mind the negligible lag.
Perhaps someone who has tried a faster card can comment on Droid on SD, as NAND speed offers the fastest, but without the flexibility.
GLO said:
When i asked my friend who was the Sales Director of Sandisk Australiasia, he said that the read and write speeds of the supplied Class 2 was more than enough, since these Class 2 is the minimum guaranteed write speeds for that card.
Personally, i'd like to use a faster card, but i think that the key here is the quality of the card over the speed. Im using android over SD and dont mind the negligible lag.
Perhaps someone who has tried a faster card can comment on Droid on SD, as NAND speed offers the fastest, but without the flexibility.
Click to expand...
Click to collapse
I found a really old thread where people were saying it is fully supported. Thanks for the answer! I want to use android on the sd too because I don't really want to risk messing up my phone with a rom install.
It's been around for ages that the speed of the SD doesn't matter for SD android.
what matters is the access time, here's a thread for benchmarks:
http://forum.xda-developers.com/showthread.php?t=1048649
the smaller the access time the better. in other words, you might get a class 10 card with long access time, and a class 2 with short access time, the class 2 will perform better overall (faster system loading, etc). but when you copy large files the class 10 will be faster.
meaning: for running android on SD you need a faster access time, and each millisecond counts.
[edit] forgot to say that random read and write speeds play a good role as well.
I use PNY 32GB class 10 MicroSD card in my HD2. No problem at all. Phone is only one week old and haven't installed any cooked ROM yet so 32GB card on stock ROM.
yes, a class 10 would work perfect with stock or custom windows ROMs. and with NAND android to some point.
I'm talking about SD android which, in case you haven't read the previous posts, he wants to run a build on his SD. and that's where the class 10 cards start to look bad. they mostly have slower random read/write speeds. In usage terms that's: lags, lags, errors, and more lags.
Related
Hi all,
I'm going to finally have some spare time this weekend and might even get to have a mess around with Android on my HD2 if I get lucky! My concern is that I have a 16GB Class2 microSD in my Leo and while looking at HD2 stuff on ebay came across this.
The seller states that Android won't run (properly?) on his 16gb Class2 and includes a Class6 8gb card aswell for this purpose.
What's everyone's experience with running Android on a slower card? From looking around I've seen people saying 'there isn't much difference' for most things but a lot of contridictions for others.
Thanks gang!
I have no issues with my Android build currently, and it's on a 4gb Class 2 SD card.
It does help having a faster one, but It's not the end of the world.
Phil
Have been testing out froyostone sense build on a 2gb class 2 card and it's like lightening So yes, would format first though otherwise you will get lag.
Cheers - yep I won't forget to format, been reading the threads while working this week... taken in loads of info, just need to find the time to actually get it rolling
I was wondering the same thing. I installed froyostone 08.07.2010 using miri Rom on stock radio on a friends hd2 and it freezes and comes back to life very often. Would a higher class sdcard solve his problem?
I think they guy on eBay is talking rubbish. I run darkstone's 2.2 perfectly well on a 16GB Class 2. A Class 4 would probably help a little bit, but I'm not that fussed really.
I'd be more concerned about getting dodgy copies of Transformers from them!!
murdaralph said:
I was wondering the same thing. I installed froyostone 08.07.2010 using miri Rom on stock radio on a friends hd2 and it freezes and comes back to life very often. Would a higher class sdcard solve his problem?
Click to expand...
Click to collapse
The whole OS and all animations etc, or just touch screen response?
If its the touch screen, that's a known issue and will be addressed in due course.
Phil
It's in german, but i guess u may figure it out.
h**p://***.chip.de/bestenlisten/Bestenliste-microSD-Karten--index/detail/id/867/
I have a kingston class 2 , not working.
qingcai said:
I have a kingston class 2 , not working.
Click to expand...
Click to collapse
A Little more information would be useful, what's not working about it? How's it formatted? Has it even been formatted and then had a new build copied to it?
Phil
i never had issues with a class 2 before... no SOD or anything... although after switching to class 4, there is noticeable speed. now in class 10, a lot faster. but no real issues in class 2 except a tad slower (but decent speed nonetheless)
I use the 16gb class 2 card and its quick with decent quadrant tests. I think its because android loads into ram (please correct me if I am wrong, ill search for this later). I think there are apps that read or write to folders on the SD card that would gain from speed of a class 6 or 10 card and if I am right about loading to ram the boot up time could receive a benefit.
Personally I am looking to get one just to access media faster and for taking pics and vids as there is a write delay that's typical with all phones. If it helps android in its current state the cool but I'm not in a rush. Development here have made great strides in making android snappy and android is an awesome is as it is for handling background tasks. Much to the credit of Linux but I find android to be a faster evolution then most mobile oses. Much to the credit of being open source and encourage community development. Nothing here is illegal but maybe some grey areas in closed source distributing which cyanogen had an interesting situation that was resolved quickly with Google's assistance.
But I am off topic now. Yes it would help with some things but don't break the piggy bank over it.
Hope my thoughts are helpful. It would be better to get feedback from those that have done it and get before and after boot, quad, and market download responsiveness tests. I may have a class 6 8gb card somewhere I can test later tonight. I would do fresh sdformatter formats with nothing but android on the card to get a somewhat standard benchmark.
Sent from my HTC HD2 using XDA App
Mine is 16gb class 2, with the latest fullram zimage, i score 29.2fps in neocore test
and can play sparta! very smooth, also the asphalt 5
kerman19 said:
The whole OS and all animations etc, or just touch screen response?
If its the touch screen, that's a known issue and will be addressed in due course.
Phil
Click to expand...
Click to collapse
the touch screen. The SD card was quick formatted. Would that make a difference in the builds performance ?
I'm using a Kingston class 2, but it performs with 5,5MBs writing speed when used in a computer slot, so in practice its a class 5,5. Works great! Froyostone sense v1
pappadj said:
I use the 16gb class 2 card and its quick with decent quadrant tests. I think its because android loads into ram (please correct me if I am wrong, ill search for this later). I think there are apps that read or write to folders on the SD card that would gain from speed of a class 6 or 10 card and if I am right about loading to ram the boot up time could receive a benefit.
Personally I am looking to get one just to access media faster and for taking pics and vids as there is a write delay that's typical with all phones. If it helps android in its current state the cool but I'm not in a rush. Development here have made great strides in making android snappy and android is an awesome is as it is for handling background tasks. Much to the credit of Linux but I find android to be a faster evolution then most mobile oses. Much to the credit of being open source and encourage community development. Nothing here is illegal but maybe some grey areas in closed source distributing which cyanogen had an interesting situation that was resolved quickly with Google's assistance.
But I am off topic now. Yes it would help with some things but don't break the piggy bank over it.
Hope my thoughts are helpful. It would be better to get feedback from those that have done it and get before and after boot, quad, and market download responsiveness tests. I may have a class 6 8gb card somewhere I can test later tonight. I would do fresh sdformatter formats with nothing but android on the card to get a somewhat standard benchmark.
Sent from my HTC HD2 using XDA App
Click to expand...
Click to collapse
You have experience with your G1, the class 6 I use on mine makes definite difference when running apps from your sd card. I've been alternating using my 16 GB Class 2 and my 8 GB Class 6 in my HD2 but I haven't seen any speed difference with android so I believe that it runs on the internal ram.
i think class 2 is enough
murdaralph said:
the touch screen. The SD card was quick formatted. Would that make a difference in the builds performance ?
Click to expand...
Click to collapse
Touch Screen lag/freezing is a known issue right now and doesn't relate to the SD card.
It's being worked on.
Phil
I have a class 2 16GB sandisk drive and score 1578 in quadrant standard, that said i usually get write speeds of around 6MB/sec on my computer
i personally think it helps a bit ( i ws previously running Android off the 16GB class 2 card the HD2 came with) but experienced some lag when scrolling.
That said, it was an early build of Android so it was probably just that.
The thing is, 8GB class6 cards are relatively cheap to buy (i picked up an A-DATA 8GB class 6 for $21 canadian at CanadaComputers)
so..why not upgrade to the class6 card? I'm sure it wouldn't hurt and no matter what you'll experience at least have SOME sort of performance gain in other aspects (music, pictures, file managers, etc)
So I downloaded this app call H2testw.exe to test for legit sdcards but it also tells the read/write speed as well. I am testing my 8gb and 1gb cards. I set it to write a 300 mb files to the card and verify it.
Info about Android running on the two cards:
8gb = lags coming out of sleep, touch screen freezes, write~7.5 mb/s, read~12mb/s
1gb = no lags, no touch screen, write~4.3mb, read~13mb/s
I'm confused. The read speed is almost the same yet the 1gb microsd is more responsive running MDJ android compared to the 8gb microsd. Any thought?
UPDATE: Maybe this is what's causing the problem. Stolen from Engadget.
What we've learned from our tipsters and from documents culled from Microsoft, Samsung, and others is that the big issue is random access performance -- a figure that isn't taken into account in a card's class rating. Ironically, Microsoft discovered in its testing that cards with higher class ratings actually performed worse on Windows Phone 7 because the tweaks card manufacturers make to achieve high sequential throughput can actually hurt random access times. There's some rocket science involved here, but basically, it's a tradeoff and a bit of a gamble -- if a manufacturer tunes a card for a high class rating, it takes more time to access the first byte at a new location on the card because it's optimizing access for that area of memory, but once it does that, it can blast sequential bytes at very high speed. If you've got a lot of small reads or writes you need to make to different files at different locations in the card's memory, though, you really start to suffer. Cards with lower class ratings tend to spend less time optimizing sequential access prior to the first read / write operation, so it can move around the card (that is, access it randomly) much faster.
Click to expand...
Click to collapse
Source:
http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/
They are probably different classes, plus it naturally takes longer with a bigger card because there's more files and more space to read and write
Sent from my HD2 Nexus One using XDA App
I get screen freezes with 8gb and up but rarely with new builds, haven't tried a card higher than class 6
Also I'm on radio 2.15
Sent from my HD2 Nexus One using XDA App
Oddly enough, I have two 8gb cards, one class 4 the other class 6, and they hiccup more than my 16gb class 2.
Now that is weird.
I'm lost myself...I'm thinking off just getting me a 4gb card and hope for the best...
I heard the 16gb class 10 is perfect but it still cost to much for nand to be around the corner
Sent from my HD2 Nexus One using XDA App
16 gb class 10 no lag cost me over 100 pounds tho
Sent from my HTC Desire using XDA App
Cheapest 16GB - lags from time to time :/
Maybe defragmentation may help?
tomus said:
Cheapest 16GB - lags from time to time :/
Maybe defragmentation may help?
Click to expand...
Click to collapse
Defrag wont help...scan for errors...try to have only the android folder and see if it makes a different ..
Btw, guys...
all sd cards are not created equal. all sd cards of the same CLASS are not created equal.
Check out the ongoing drama with win7 phones with SD slots....
class measures throughput, what affects the SOD and related issues is random access speed, not throughput so much.
It's just my 2 cents, but I've tested Class 2, 4, and 6 MicroSDHC cards and found very little noticeable difference once Android is fully booted up and running on the HD2. Moreover, none of the cards create screen freezes or SOD issues or high battery drain problems here. That said, I have noticed that the actual boot time and file transfer speed (from the PC to the card) can be faster on average with quality higher class rated cards of the same size. Also, I've found that the larger the card size, the longer the android boot time, no matter the class. Guess that makes sense, as the system need to read more sectors with larger size cards. Please note that I've only tested Sandisk, Toshiba, TopRam and Samsung cards to date. What's kind of strange is that the Class 2 16 & 32GB Sandisk cards run just as well or slightly better for some reason than some of my higher class rated cards. Go figure...
As far as issues go, I recommend only using quality brand name cards, no ebay fakes or cheap no name brands. Also, I've had great luck formatting all my cards with SD Formatter v2.0 and v3.0, using the quick format mode with the standard 32kb cluster size.
Best to all,
R
rhacy said:
It's just my 2 cents, but I've tested Class 2, 4, and 6 MicroSDHC cards and found very little noticeable difference once Android is fully booted up and running on the HD2. Moreover, none of the cards create screen freezes or SOD issues or high battery drain problems here. That said, I have noticed that the actual boot time and file transfer speed (from the PC to the card) can be faster on average with quality higher class rated cards of the same size. Also, I've found that the larger the card size, the longer the android boot time, no matter the class. Guess that makes sense, as the system need to read more sectors with larger size cards. Please note that I've only tested Sandisk, Toshiba, TopRam and Samsung cards to date. What's kind of strange is that the Class 2 16 & 32GB Sandisk cards run just as well or slightly better for some reason than some of my higher class rated cards. Go figure...
As far as issues go, I recommend only using quality brand name cards, no ebay fakes or cheap no name brands. Also, I've had great luck formatting all my cards with SD Formatter v2.0 and v3.0, using the quick format mode with the standard 32kb cluster size.
Best to all,
R
Click to expand...
Click to collapse
Great info here. I think I will just order me a new card from a reputable brand. Maybe my card is just getting old. Maybe a 16gb from Amazon will do. They aren't too expensive nowaday. ~$26.
Does the Radio version effects the lag of the sd card? Or the kernel?
distruct said:
Does the Radio version effects the lag of the sd card? Or the kernel?
Click to expand...
Click to collapse
No, not on the sd but radio does effect how the build will run, your phone calls, your battery.
Could this be the reason why class don't matter on hd2 android? I mean even some class 4 & 6 have lag and sod problem. I pulled this bit from engadget. It's an article on wp7 and memory card issues.
What we've learned from our tipsters and from documents culled from Microsoft, Samsung, and others is that the big issue is random access performance -- a figure that isn't taken into account in a card's class rating. Ironically, Microsoft discovered in its testing that cards with higher class ratings actually performed worse on Windows Phone 7 because the tweaks card manufacturers make to achieve high sequential throughput can actually hurt random access times. There's some rocket science involved here, but basically, it's a tradeoff and a bit of a gamble -- if a manufacturer tunes a card for a high class rating, it takes more time to access the first byte at a new location on the card because it's optimizing access for that area of memory, but once it does that, it can blast sequential bytes at very high speed. If you've got a lot of small reads or writes you need to make to different files at different locations in the card's memory, though, you really start to suffer. Cards with lower class ratings tend to spend less time optimizing sequential access prior to the first read / write operation, so it can move around the card (that is, access it randomly) much faster.
Click to expand...
Click to collapse
Source:
http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/
azzzz said:
Could this be the reason why class don't matter on hd2 android? I mean even some class 4 & 6 have lag and sod problem. I pulled this bit from engadget. It's an article on wp7 and memory card issues.
Source:
http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/
Click to expand...
Click to collapse
Obviously.
Been saying this for a while, myself - I have experimented, and I get SOD every time with my 16gb class 6 card, but rarely with my class 2 8gb, and never ever (and, tbh, better responsiveness overall) with my 2gb NON-HC card
enneract said:
Obviously.
Been saying this for a while, myself - I have experimented, and I get SOD every time with my 16gb class 6 card, but rarely with my class 2 8gb, and never ever (and, tbh, better responsiveness overall) with my 2gb NON-HC card
Click to expand...
Click to collapse
I hope so...my class 2 16gb will be here in a couple of days...i hope it's faster than my current 8gb class 4....
Update: my 16gb class 2 sandisk is here. Things have improved alot. Wake up is faster now with less lag, market download speed is faster now (10kb vs 100kb). Hopefully system performance will be better...
So Ive been using the 16gb Class 2 sd card that came with my HD2 for WP7 and I havent really had any problems with it. Occasionally it reboots for no reason, but aside from that, its perfect. However, my friend just gave me his 4gb Class 4 card. Should I keep using the 16gb or reset my phone with the faster 4gb?
simple test, all sd cards work differently
my Nokia 4GB Class 6 is better than may Sandisk 16GB Class 2
Xbox Live Installation: ( only the installation without download )
Nokia 4GB Class 6: 1:23 minutes
Sandisk 16GB Class 2: 9:41 minutes
peace warhead said:
So Ive been using the 16gb Class 2 sd card that came with my HD2 for WP7 and I havent really had any problems with it. Occasionally it reboots for no reason, but aside from that, its perfect. However, my friend just gave me his 4gb Class 4 card. Should I keep using the 16gb or reset my phone with the faster 4gb?
Click to expand...
Click to collapse
Class 2 cards usually work better for wp7. Actually class means nothing when it comes to wp7... you want good random access speed for wp7 to run smooth. Many times, the tricks that manufacturers do to their cards to get higher sequential write speeds will actually reduce the random access speed. They don't keep the random access speed consistent on any of their cards as that speed isn't rated, so even cards of the same brand and class can differ greatly from batch to batch. A card made one day may run wp7 well while the same card made a month later may not. So far it seems class 2 sandisk are the most consistent in keeping good random access speed, so if you are going for a card for wp7, go for class 2 sandisk with model numbers ending in A11M. If you already have a card that works well, no reason to switch unless you want to change the size, because there's no way to guarantee a card will work well until it's tested.
Hi everyone,
could someone please explain me what all those "performance tweaks" are that the chefs are cooking into their roms?
i cant find anything about what they did... (search is offline for 20-30 min and other external searchengines also not find anything intressting)
i can see in some videos on youtube that the phone is faster - but why?
im using a class 6 16gb sdcard, so thats not be a problem i think...
can someone please enlighten me?
Thx!
whopper_g said:
Hi everyone,
could someone please explain me what all those "performance tweaks" are that the chefs are cooking into their roms?
i cant find anything about what they did... (search is offline for 20-30 min and other external searchengines also not find anything intressting)
i can see in some videos on youtube that the phone is faster - but why?
im using a class 6 16gb sdcard, so thats not be a problem i think...
can someone please enlighten me?
Thx!
Click to expand...
Click to collapse
ah somebody else noticed this, i believe they messed with some caches and that about somes it up, to be perfectly honest i dont see any where a noticable speed improvment could be made with regards to the UI so its all a bit of FUD if you ask me.
with regards to your speed, just because its a 16GB class 6 doesnt automatically make it work, infact, if its stable at all your on to a winner, ive got a class 2 thats quicker than a 4, its just luck of the draw, most slowdowns are SD related, try other cards, dont splash out because it might not even work but play around and see what you can get.
Most chiefs use these tweaks
Not really "performance", more "optimizations"
dazza9075 said:
with regards to your speed, just because its a 16GB class 6 doesnt automatically make it work, infact, if its stable at all your on to a winner, ive got a class 2 thats quicker than a 4, its just luck of the draw, most slowdowns are SD related, try other cards, dont splash out because it might not even work but play around and see what you can get.
Click to expand...
Click to collapse
Yeah, it's not the rated class that matters with wp7... the class just rates the sequential write speed. It's random access speed that matters with wp7 (or when running any os off a sd card)... it's the time it takes to access small random bits of data when to os needs it. Higher class cards actually tend to have lower random access speed because of the tweaks the manufacturer does to raise the sequential write speed.
To raise the sequential read and write speed, the higher class card will initialize the part of the chip thats being used before actually using it so it can then write or read to that part more quickly... but that takes time to initialize, and ends up taking longer if you are just grabbing one little bit of data from one part and a bit from another part, etc than it will take a class 2 card which doesn't do the initializing process and just starts grabbing the data when it's asked to.
Microsoft found this when testing sd cards for wp7... class 2 cards tended to work better than class 6 or 10 cards. It doesn't necessarily mean a class 6 or 10 card won't work, or that a class 2 card will definitely work, but more class 2 cards worked than class 6.
Also, since card makers don't really rate the random access speed, they don't keep the speed very consistent batch to batch... even with a card that's the same brand and class. You might get a Class 4 sandisk that works great, but someone else gets the exact same class 4 sandisk, but it was made a week later at the same factory and it may not work. The chips they use can be different from batch to batch, and they only watch and keep the sequential read and write speeds consistent.
Hopefully now that wp7 needs cards with good random access speed, card makers will rate that speed and sell cards good for wp7. And also when running android off SD, I've found that random access speed is what makes the biggest difference in performance. I remember reading about people having more lag in sd android builds with higher class cards... well that's why.
dazza9075 said:
ah somebody else noticed this, i believe they messed with some caches and that about somes it up, to be perfectly honest i dont see any where a noticable speed improvment could be made with regards to the UI so its all a bit of FUD if you ask me.
with regards to your speed, just because its a 16GB class 6 doesnt automatically make it work, infact, if its stable at all your on to a winner, ive got a class 2 thats quicker than a 4, its just luck of the draw, most slowdowns are SD related, try other cards, dont splash out because it might not even work but play around and see what you can get.
Click to expand...
Click to collapse
Your are right. i have to correct me - i got an 16 GB Class 2 SanDisk Card.
But why is there no info on how they speed up the MarktPlace that much? Its obvious that it is indeed faster - at least on Mobile network...
Sakem said:
Most chiefs use these tweaks
Not really "performance", more "optimizations"
Click to expand...
Click to collapse
Yeah i see that - but, as you allready said, those are no perfomance tweaks ... but thanks for the hint...
zarathustrax said:
Yeah, it's not the rated class that matters with wp7... the class just rates the sequential write speed. It's random access speed that matters with wp7 (or when running any os off a sd card)... it's the time it takes to access small random bits of data when to os needs it. Higher class cards actually tend to have lower random access speed because of the tweaks the manufacturer does to raise the sequential write speed.
To raise the sequential read and write speed, the higher class card will initialize the part of the chip thats being used before actually using it so it can then write or read to that part more quickly... but that takes time to initialize, and ends up taking longer if you are just grabbing one little bit of data from one part and a bit from another part, etc than it will take a class 2 card which doesn't do the initializing process and just starts grabbing the data when it's asked to.
Microsoft found this when testing sd cards for wp7... class 2 cards tended to work better than class 6 or 10 cards. It doesn't necessarily mean a class 6 or 10 card won't work, or that a class 2 card will definitely work, but more class 2 cards worked than class 6.
Also, since card makers don't really rate the random access speed, they don't keep the speed very consistent batch to batch... even with a card that's the same brand and class. You might get a Class 4 sandisk that works great, but someone else gets the exact same class 4 sandisk, but it was made a week later at the same factory and it may not work. The chips they use can be different from batch to batch, and they only watch and keep the sequential read and write speeds consistent.
Hopefully now that wp7 needs cards with good random access speed, card makers will rate that speed and sell cards good for wp7. And also when running android off SD, I've found that random access speed is what makes the biggest difference in performance. I remember reading about people having more lag in sd android builds with higher class cards... well that's why.
Click to expand...
Click to collapse
Thanks for the good explanation from the hardware point of view. but again all tweaks they made are software side.
Could it be that this is just a subjective speed improvement?
I got a 32Gb MicroSDHC class-10 memorette card.
I verified the speed with a card reader + h2testw that write speed is : 14.7MByte/sec
read speed: 17.5MByte/sec
But when I used the class10 card in tmobile HD2, I am shocked.
When I copy a 720MB movie the write speed is about 4MByte/sec.
h2testw program when used on hd2 connected to PC, showed write speed as 4.8 MByte/sec only.
It needs to be noted the same card when tested with h2testw and a card reader gave 14MByte/sec but gives less than 4.5MB/sec on HD2.
How to fix this problem of HD2 microsd card speed!
Looks like HD2 usb controller has some problem.
the card is indeed class-10.
Please let me know a solution to this problem on HD2.
downbc1 said:
I got a 32Gb MicroSDHC class-10 memorette card.
I verified the speed with a card reader + h2testw that write speed is : 14.7MByte/sec
read speed: 17.5MByte/sec
But when I used the class10 card in tmobile HD2, I am shocked.
When I copy a 720MB movie the write speed is about 4MByte/sec.
h2testw program when used on hd2 connected to PC, showed write speed as 4.8 MByte/sec only.
It needs to be noted the same card when tested with h2testw and a card reader gave 14MByte/sec but gives less than 4.5MB/sec on HD2.
How to fix this problem of HD2 microsd card speed!
Looks like HD2 usb controller has some problem.
the card is indeed class-10.
Please let me know a solution to this problem on HD2.
Click to expand...
Click to collapse
The HD2 doesn't read or write to sd cards at that high of speed... that's why it's pointless using class 6 or 10 cards in a HD2. I think most phones are like that. Class 6 and 10 cards are mainly used for digital cameras, where having high sequential write speeds matters.
zarathustrax said:
The HD2 doesn't read or write to sd cards at that high of speed... that's why it's pointless using class 6 or 10 cards in a HD2. I think most phones are like that. Class 6 and 10 cards are mainly used for digital cameras, where having high sequential write speeds matters.
Click to expand...
Click to collapse
I have earlier used a nokia 5800 xpressmusic phone with a class 6 16GB card.
The data transfer speeds were higher than HD2.
Generalizing from a single instance (HD2 scenario) may not be correct.
I'm going to go with that the HD2 does not transfer faster than 5.3 MB/sec between the PC and the phone regardless of what the internal transfer rate between the phone and card is.
Using a class 6 card myself, i have noticed that the phone is much more responsive than it was with the class 2 card in there and movies play without stuttering from the class 6 card and applications launch quicker.
my nokia n81 8gb did 8MB/sec from internal 8GB and so did my KM900. The KM900 did 6.2MB from the same classs 6 card
I was under the impression the HD2 maxed at 16 gig. Maybe that's the problem?
Like zarathustrax said, the HD2 isn't capable of read/write any higher than a class 4 card. I think somewhere on the EVO forum there's a fix to unlock the read/write capability for a higher speed but I dunno if anyone here has tried the fix, or if it even works for the HD2 at all.
anhyeuemmaimai said:
I'm going to go with that the HD2 does not transfer faster than 5.3 MB/sec between the PC and the phone regardless of what the internal transfer rate between the phone and card is.
Click to expand...
Click to collapse
This is not true. I've copied large files at over 10MB/s directly to the phone. I can't vouch for every hd2 though as it's quite possible they have different hardware. Also the speed drops dramatically if you're copying many smaller files.
I am thinking to buy memorette 32 gb microsd class 10 for my HD2.
As far as I have understood:
1) No matther what I cannot use it fully Class 10 speed when connected to HD2
2) When I connect it to my PC with card reader I can fully use class 10 speed.
I have sandial 8 gb class 2. When I connect it to my pc with card reader and transfering large amount of data (150+ MB), it cease to operate. I have to reconnect it. Then I shuld transfer in less amount of data or reduce copy speed (such as UltraCopy) . I think that is a safety issue for preventing disk from get burned. My question is, will I possibly have some issues with memorette or some other class 10 cards?
Also would it not better using class 10 card in HD2 for using on SD installed Operating System instead of class 6 or 4?
I would appriciate if someone return about memorette. I have never heard about that trademark. I am planning to bid on ebay today.
Sent from my HTC HD2 using XDA App
lude219 said:
Like zarathustrax said, the HD2 isn't capable of read/write any higher than a class 4 card. I think somewhere on the EVO forum there's a fix to unlock the read/write capability for a higher speed but I dunno if anyone here has tried the fix, or if it even works for the HD2 at all.
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Click to collapse
fix to unlock the read/write capability for a higher speed ????? Really ... i have buy a micro sd 16GB class 10 ........
morfil said:
I am thinking to buy memorette 32 gb microsd class 10 for my HD2.
As far as I have understood:
1) No matther what I cannot use it fully Class 10 speed when connected to HD2
2) When I connect it to my PC with card reader I can fully use class 10 speed.
I have sandial 8 gb class 2. When I connect it to my pc with card reader and transfering large amount of data (150+ MB), it cease to operate. I have to reconnect it. Then I shuld transfer in less amount of data or reduce copy speed (such as UltraCopy) . I think that is a safety issue for preventing disk from get burned. My question is, will I possibly have some issues with memorette or some other class 10 cards?
Also would it not better using class 10 card in HD2 for using on SD installed Operating System instead of class 6 or 4?
I would appriciate if someone return about memorette. I have never heard about that trademark. I am planning to bid on ebay today.
Sent from my HTC HD2 using XDA App
Click to expand...
Click to collapse
A good quality class 2 or 4 sd card is usually better for running an operating system off of, as lower class cards tend to have faster random access speed and better random read/write speeds. Class 6 and 10 sd cards are designed to have a higher sequential write speed, but to achieve these higher speeds, the card initializes the part of the card that's about to be used. The initialization takes some extra time to get started, but boosts the sequential write/read speed so it's great for digital cameras or writing files sequentially.
But when it comes to using the card to run an OS off of, like android or wp7, or using the card to run apps off of, you are going to be reading and writing many small bits of data from different parts of the card. When it comes to this, you need a card that has a good random access speed and random read/write speeds. A high class card that is tweaked to have high sequential read/write speeds ends up being slower because it keeps initializing each part of the card before accessing it, while the lower class 2 or 4 card that doesn't do the initialization is a lot quicker accessing many small parts of the card because it doesn't have that extra step... but they don't get the speed boosts with sequential read/write.
Many people just assume that a higher class card is always going to be better, but this isn't true at all. It all depends on what you are using the card for. Higher class 6 or 10 cards are perfect for digital cameras, recording video, or transferring large files, etc... if you are going to be doing sequential reading or writing, higher class is better.
But for running apps off of, or running an OS off of, or using it as internal memory for an OS like wp7, or anything that will be accessing many parts of the card quickly or reading many small bits of data, etc., you want a card with a good random access speed and random read/write speeds, and that is something that is not rated on cards... but generally lower class cards are better than higher class cards... especially if you get a good quality brand, like sandisk. Sandisk class 2 and 4 are very good cards for random access speeds.
I hope some of you find this info useful and stop assuming a higher class card means better for all situations.
buzz killington said:
This is not true. I've copied large files at over 10MB/s directly to the phone. I can't vouch for every hd2 though as it's quite possible they have different hardware. Also the speed drops dramatically if you're copying many smaller files.
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Click to collapse
You must be special then. In my tests I had no difference in a class 2 and class 6.
morfil said:
I am thinking to buy memorette 32 gb microsd class 10 for my HD2.
As far as I have understood:
1) No matther what I cannot use it fully Class 10 speed when connected to HD2
2) When I connect it to my PC with card reader I can fully use class 10 speed.
I have sandial 8 gb class 2. When I connect it to my pc with card reader and transfering large amount of data (150+ MB), it cease to operate. I have to reconnect it. Then I shuld transfer in less amount of data or reduce copy speed (such as UltraCopy) . I think that is a safety issue for preventing disk from get burned. My question is, will I possibly have some issues with memorette or some other class 10 cards?
Also would it not better using class 10 card in HD2 for using on SD installed Operating System instead of class 6 or 4?
I would appriciate if someone return about memorette. I have never heard about that trademark. I am planning to bid on ebay today.
Sent from my HTC HD2 using XDA App
Click to expand...
Click to collapse
I am using memorette class 10 32GB microsd currently.
Its affordable and is fully working. I have tested to full capacity read/write using h2testw as I wrote in an earlier post.
Just check the seller's feedback and the description though.
I use TEAM micro sd class 10 on my hero,but after a month my sd card write speed is only 2MB/s.
At the first time,it reach 11MB/s when i tested it with h2testw and sd speed test on my handset.
I only use 640MB for app2sd (ext2) without swap cache.
Could someone explain to me what was happen to my sd card?
Sorry for my bad English