Database Users

SD read/write speed causing lag on my HD2 but...

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...

[Q] Performance tweaks?

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?

[Q] Do you prefer Android NativeSD or Nand with DataOnExt boot or NAND boot?

Which Option Do you prefere ?
NAND
[email protected], [email protected], [email protected]
For T-Mobile USA HD2 (LEO 1024)
Please visit my ICS NAND thread for the installation steps.
NAND with DataOnEXT
[email protected], [email protected], [email protected]
For EU/International HD2 (LEO 512)
Please create a FAT32 primary partition with 32KB cluster size, then an EXT4 primary partition with default cluster size on your SD card.
Please visit DataOnEXT thread for more info.
(I modified DataOnEXT to be able to use with NativeSD at the same time. Share the same data.)
NativeSD (SD-EXT)
[email protected], [email protected], [email protected]
For high speed read/write SD Card only (Class 6 or 10). Otherwise you may get poor performance.
Please create a FAT32 primary partition with 32KB cluster size, then an EXT4 primary partition with default cluster size on your SD card.
Please visit NativeSD thread for more info.

I use NativeSD (SD-EXT), since i have a strong suspicion the NAND memory of my HD2 is corrupt.
I have a class 10 SD and installed Nexus Jellybean. The ROM is running very slow, starting an app (i.e. Facebook) can take up to 1 minute.

Prefer DataOnEXT since my microSDHC card is Class 6. My tests showed that reading from card tends to be faster than Nand, but writing is slower. Also I believe power consumption is lower when working with Nand as opposed to SD, though I haven't looked into this or did any tests to check if this is the case. I allocated all nand memory to /system and would move some of my apps there with the rest being on SDHC. Otherwise this nand memory is left out to be good for nothing.

jvzijp said:
I have a class 10 SD and installed Nexus Jellybean. The ROM is running very slow, starting an app (i.e. Facebook) can take up to 1 minute.
Click to expand...
Click to collapse
Because class 10 cards have rubbish random write speed, so arent great for running roms. I have a class 4 that is several orders faster than my class 10 at random r/w and it really shows,, the class 4 out performs the class 10 at nativesd by a lot. Class10,, juddery, lockups, long waits,,, class 4 smooth as silk.

I use NativeSD.Although my card is class4 I think is faster than the nand.
I expect next week card class10.

samsamuel said:
Because class 10 cards have rubbish random write speed, so arent great for running roms. I have a class 4 that is several orders faster than my class 10 at random r/w and it really shows,, the class 4 out performs the class 10 at nativesd by a lot. Class10,, juddery, lockups, long waits,,, class 4 smooth as silk.
Click to expand...
Click to collapse
I just installed on a Class 4 and you are absolutely right! It is fast!
menioseten said:
I use NativeSD.Although my card is class4 I think is faster than the nand.
I expect next week card class10.
Click to expand...
Click to collapse
Don't install on a Class 10, that is rubbish!

On a Class 10 it is really faster than class 4
class 10 ----> 10 mb read speed
class 4 ---> 4 mb read speed
but this is my opinion for me it is faster

I use NAND with DATA on EXT, 16Gb class 10 micr SD.
It works very smoothly and save battery consumption.

I think NativeSD is the best solution, because no problems with free space and bad blocks, even on a class4.

yozgatdeluxee said:
On a Class 10 it is really faster than class 4
class 10 ----> 10 mb read speed
class 4 ---> 4 mb read speed
but this is my opinion for me it is faster
Click to expand...
Click to collapse
thats sequential read/write, , , not random read write.
example, see the two tables of results, post 1, here (a little old, but shows the point)
http://forum.xda-developers.com/showthread.php?t=1150369
for the direct read write, of course class 10 blows the others out of the water, but look at the random read write results, , a class 2 card wins! the first class 10 card doesn't appear till 16th on the list.
class 10 is great for recording video, large files, but rubbish for random small read/writes. The designers trade off random access in favour of sequential access.
A tricked up hot rod is way faster than a fiat punto in a straight line, but a punto would get around london city center way faster than a hot rod.
There ARE fast class 10 cards out there, but they're not as fast as you think for use as nativeSD cards.

I'm fairly sure that some SD cards also aren't compatible with MAGLDR. I just installed PACman to see what's so good about it (some things are vastly improved over NexusHD2 but in terms of certain apparently minor actions such as opening the notifications tray it seems oddly laggy) and when I tried the NativeSD method it was taking ages. The ROM was installing, but so slowly that it probably would have taken over half an hour to complete, so I pulled the battery and switched to a NAND install and everything went smoothly. Normal SD builds also don't work with my Kingston 16GB Class 4 :/

I earlier had SanDisk class 4 sd card.... ran faster than nand... Now on the SanDisk new ultra sd card with 30mbps Write speed. .. The rom is even slightly faster than on class 4
handwritten from my note 2 (N7100)

Nigeldg said:
so slowly that it probably would have taken over half an hour to complete,
Click to expand...
Click to collapse
did you choose odexed? because that takes a long time to complete, compared to deodexed.
you're right though, there are many reports about certain cards not playing nice with magldr/hd2 in general.

samsamuel said:
did you choose odexed? because that takes a long time to complete, compared to deodexed.
you're right though, there are many reports about certain cards not playing nice with magldr/hd2 in general.
Click to expand...
Click to collapse
Nah I left it as deodexed, I saw the progress in the bottom and it was saying 'extracting xxxx.apk' and for each .apk it was taking about 30-40 seconds. When I did it flashing on NAND it was fast enough that at the very least I couldn't read what it was saying there.

jvzijp said:
I use NativeSD (SD-EXT), since i have a strong suspicion the NAND memory of my HD2 is corrupt.
I have a class 10 SD and installed Nexus Jellybean. The ROM is running very slow, starting an app (i.e. Facebook) can take up to 1 minute.
Click to expand...
Click to collapse
me too
any apps are very slow... after installation of +40 apps , the ROM has various lags
---------- Post added at 12:58 AM ---------- Previous post was at 12:57 AM ----------
samsamuel said:
Because class 10 cards have rubbish random write speed, so arent great for running roms. I have a class 4 that is several orders faster than my class 10 at random r/w and it really shows,, the class 4 out performs the class 10 at nativesd by a lot. Class10,, juddery, lockups, long waits,,, class 4 smooth as silk.
Click to expand...
Click to collapse
explain better that concept
the NAtiveSD developpers know that particular ?

I use everything on NAND, because I often change my SD
Sent from my NexusHD2 using xda app-developers app

mirage-19 said:
I use everything on NAND, because I often change my SD
Sent from my NexusHD2 using xda app-developers app
Click to expand...
Click to collapse
hd2EU has little memory nand so it is best nativesd good with 1 sd card

Which SD-Card NativeSD
Hey
finally a thread where I think my question is in the right place:
Which SD-Cards could you advice me to use for NativeSD?
I bought a Transcend 16gb Class 10 and I really don't recommend that. It's laggy and slow-loading and has no advantage to my 2gb Class 4 Sandisk, except the additional 14gb storage.
The descriptions in the different Native-SD-ROM threads make me feel awkward all the time. They always say something like "very fast" or "smooth", but I don't experience that.
So I started looking for a thread with SD-Card experiences and recommendations for native-sd, but didn't find any.
If you could share a link or your favourite SD-Card I would be very happy!
Regards

rubb3ld1ek4tz said:
Hey
finally a thread where I think my question is in the right place:
Which SD-Cards could you advice me to use for NativeSD?
I bought a Transcend 16gb Class 10 and I really don't recommend that. It's laggy and slow-loading and has no advantage to my 2gb Class 4 Sandisk, except the additional 14gb storage.
The descriptions in the different Native-SD-ROM threads make me feel awkward all the time. They always say something like "very fast" or "smooth", but I don't experience that.
So I started looking for a thread with SD-Card experiences and recommendations for native-sd, but didn't find any.
If you could share a link or your favourite SD-Card I would be very happy!
Regards
Click to expand...
Click to collapse
Samsung or Sandisk 16 GB Class 10 best card´s ever

microSD Experiments - not very scientific
yozgatdeluxee said:
Samsung or Sandisk 16 GB Class 10 best card´s ever
Click to expand...
Click to collapse
Hi - I felt I had to enter this thread having experienced problems on NativeSD. I've been running tytungs JB on NativeSD for a couple of weeks. I have it on a Verbatim Class 10 8Gb - and there is frequent lag when opening apps. I also get odd FC's and Wifi crashes. I had put this down to the JB ROM pushing the HD2 beyond its performance threshold.
After reading this thread I have tried a new Verbatim Class 10 with tytungs GB3.3a on NativeSD. I have a direct comparison here - I also have the same ROM on my HD2 NAND. The ROM runs sweetly on NAND, but experiences some lag (mainly opening apps) on NativeSD. I will try a Class 4 Sandisk next week to check the difference.
Initially, it looks like the choice of microSD card is critical.

Statement

Every ROM above 2.3.7. is to much for the HD2 leo, I´ve tried many 4 and 4.1 roms (both NAND ans NativeSD) but none of them runs smooth enough.
Scrolling through the homescreens. which is what you see in the most tuorials op YT, is NO guarantee for a smooth working rom.
I´ts strange that I reed so little about this here, only positive experiences....

Maybe there is something wrong with your setup if there are so many positive experiences?

I use a Cyanogen jelly beam ROM daily. Its smooth as it can be and totally reliable. Everything works. All my apps and GPS.
Sent from my HD2 using the power of Jelly Bean

in-call volume for outgoing calls is too loud in every rom beyond GB. That's why it's unusable for me, not the speed or smoothness

but there are many good ics roms !!!! for example the evohd2!!!

7325 said:
but there are many good ics roms !!!! for example the evohd2!!!
Click to expand...
Click to collapse
What could I possebly do wrong then........

Hmmm, found out that my class 10 microSD is a B-brand and not as fast as I thought it would be!
I'm gonna try it again this week and buy a good one.

Genuine Sandisk class 4 or 6 are good for me. No need class 10, it won't help.
There many write-ups here but basically get a good brand name
Sent from my HD2 using the power of Jelly Bean

the hd2 doesn't support class 10. only class 6,4 and 2

hammar63 said:
Hmmm, found out that my class 10 microSD is a B-brand and not as fast as I thought it would be!
I'm gonna try it again this week and buy a good one.
Click to expand...
Click to collapse
Like many already noted - a good brand is more important than a high Class number.
---
With proper diet, rest, and exercise a healthy body will last you a lifetime... (via Tapatalk)

7325 said:
the hd2 doesn't support class 10
Click to expand...
Click to collapse
Yes it does, it's because class ten cards tends to be engineered for large contiguous read/write, (images,video,audio) but many are shockingly slow at small file random read write, which seems to be what native SD relies on most.
In general, a class six will have a better 4k readwrite than a class ten, but it's not as simple as "class six is better", because there are good class tens, you just have to research them.
(same for class four cards,there are some with adequate random rw torun native SD)

samsamuel said:
Yes it does, it's because class ten cards tends to be engineered for large contiguous read/write, (images,video,audio) but many are shockingly slow at small file random read write, which seems to be what native SD relies on most.
In general, a class six will have a better 4k readwrite than a class ten, but it's not as simple as "class six is better", because there are good class tens, you just have to research them.
(same for class four cards,there are some with adequate random rw torun native SD)
Click to expand...
Click to collapse
yes you're right. i mean the hd2 doesn't support the full speed from a class 10 sd card. but he does recongnize the sd card!!!
ps.: a class 10 sd card has a higher read and write speed than a class 6!!!! but older devices (like hd2) support the full speed from a class 6 sd card

7325 said:
ps.: a class 10 sd card has a higher read and write speed than a class 6!!!!
Click to expand...
Click to collapse
You're missing the point, it's nothing to do with the Max speed of the card, or even whether the phone steps it down to a lower class,, it's all about the random read write speed of small blocks, and if you run benchmarks ( or read some benchmark threads) you'll see that most cards, nomatter what class, will only achieve less than 0.1 m/sec at 4k block size. I've seen lots of lists of results for various cards, and loads of cards get way less than 0.1, some as low as 0.01 Megpersecond.

samsamuel said:
You're missing the point, it's nothing to do with the Max speed of the card, or even whether the phone steps it down to a lower class,, it's all about the random read write speed of small blocks, and if you run benchmarks ( or read some benchmark threads) you'll see that most cards, nomatter what class, will only achieve less than 0.1 m/sec at 4k block size. I've seen lots of lists of results for various cards, and loads of cards get way less than 0.1, some as low as 0.01 Megpersecond.
Click to expand...
Click to collapse
Finally someone got it! :thumbup:
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Don't walk behind me; I may not lead. Don't walk in front of me; I may not follow. Just walk beside me and be my friend. (via Tapatalk)

SD Card is So Freaking Slow!

I have a PNY U3 Turbo Performance 64GB High Speed MicroSDXC Class 10 UHS-I, up to 90MB/sec Flash Card. It seems to get slower with time. I mean it is literally taking me like 60 seconds to delete a few pictures. The card is formatted to portable storage. I only store music and photos on it. Reformatting offered no improvement. It is borderline unusable.
So, I benchmarked and found that my read speed is about 59 mb per sec and my write speed is 4.4 mb per sec. I can live with the read speed but the write speed is horrible. What gives?

How many pictures are you talking about, and how large are they?

128KB clusters?
I found trying to use 4K clusters in exfat was resulting in the same slowness. Reformatted to 128KB clusters and it flys (~20MB/s write ~70MB/read). Sandisk ultra plus 64GB.

I have this issue as well I have one of the fast Samsung cards. First few months worked great super fast but now takes a while to carry over a gig of pics and music. I also notice lag in loading and delteing photos through the phone

These are normal pics 5-6 MB. There has to be something wrong.

Irieone said:
These are normal pics 5-6 MB. There has to be something wrong.
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If you find any info/solution let us know.
Im thinking about running it through one of the tests that show the read/write speed, if its not up to par on that I will contact samsung see if its covered under their warranty.

Why not opt for a 128GB sd card? My Moto X Pure will be here Thursday. I have a 64GB in my old phone but I may get 128.

Has the OP tried backing up their data and reformatting the card?

gpz1100 said:
Has the OP tried backing up their data and reformatting the card?
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Yes, I have tried this a few times and it did not help. The write speed of this particular card is somewhere between 5 and 9 mb/sec. I have used multiple benchmarking tools that all confirm the same thing. The sad thing, if you drill down into the specifications for a lot of these new sd cards there is no mention of write- speeds. I asked a question similar to my OP on Reddit and had somebody with the same card echo my issue. Terrible write speeds. I am not in the mood to buy another card with great specs only to find it performs poorly in my phone? There is still a part of me that thinks it's hardware or software related and specific to the phone. I can't quite believe that something advertised as "turbo", UHS-1, Class 10, and 90 mb/sec has an actual write speed of 5 mb/sec. It seems criminal.

^^See my post #3. I've found this card to have very good write speeds on the phone of ~14-16 MB/s, reads around 40-50. On the pc through a usb 3 card reader I can write at the speeds posted above.
But yes, unless you drill down, the marketing and advertising doesn't list write speeds. I can see why. It all depends where you'll be using it. I'll be lucky to see sustained 10MB/s read through my dash cam (not sure what the write speed even is) even through the card is capable of 40MB/s +.
I should say, using the moto x, through MTP, I've seen read speeds upwards of 35-40MB/s, write speeds of about 7-10MB. The card is faster through twrp, backup stats indicate ~14-16MB/s.

http://forum.xda-developers.com/moto-x-style/general/micro-sd-speed-chart-t3196020