Database Users

Class 4 SD good enough?

Currently I'm running a 16gb class 2 that I've had since the 16gb's have been out.(used in my Nokia N800) I found a 16GB class 4 on sale in town for $69 where a class 6 is $120. My question since it hasn't been confirmed (or I suck at searching) does the Magic actually take advantage of the class 6 or with the class 4 be good enough? Thanks for any info on this.
Clinton

IMHO I think your better off with a 16gb class 6, as it is recommended for many hacks Android related. Also you could probably find it cheaper online unless Monet is not an issue.

Just rather buy in town, not a big online buyer. I've read that the class 6 is the only way to go for apps 2 SD and the like but I just wanted to have faster access times to music, video and pictures really. That's pretty much all I have on the card, maybe a few docs but nothing I need to access quickly. If the music/video player or Quick office wont see/use the extra speed increase I'd rather save the cash for a nice set of headphones or case etc..
Clinton

Well the classes indicate how fast the SD card is. Class 2 = 2 MB/s, Class 4 = 4 MB/s and so on, so you would feel a difference between the two.

Cheesebaron said:
Well the classes indicate how fast the SD card is. Class 2 = 2 MB/s, Class 4 = 4 MB/s and so on, so you would feel a difference between the two.
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Very useful. I know the difference between card speeds, what I was asking is if the Magic can take advantage of the speed increase or is there a limit? I know in using my Nokia N800 (Linux OS) even the moded kernel only took advantage of the class 4 cards and there was no benefit to the class 6.
Clinton

The SD Speed Class Ratings specify the following minimum write speeds based on "the best fragmented state where no memory unit is occupied":
Class 2: 2 MB/s
Class 4: 4 MB/s
Class 6: 6 MB/s
The Class system is a minimum speed that it should perform at, if you are lucky it will work closer to the next class speed, as most cards actually perform faster then their class.
I have an 6GB class 4 sdhc card and the transfer speed is generally around 9-11 mb/s.
If you are putting a swap file on to your sdhc, a class 4 should be a minimum class you are to look for.
Personally, I use Crystal DiskMark to test the write-transfer-speed of my cards. http://crystalmark.info/software/CrystalDiskMark/index-e.html

id242 said:
The SD Speed Class Ratings specify the following minimum write speeds based on "the best fragmented state where no memory unit is occupied":
Class 2: 2 MB/s
Class 4: 4 MB/s
Class 6: 6 MB/s
The Class system is a minimum speed that it should perform at, if you are lucky it will work closer to the next class speed, as most cards actually perform faster then their class.
I have an 6GB class 4 sdhc card and the transfer speed is generally around 9-11 mb/s.
If you are putting a swap file on to your sdhc, a class 4 should be a minimum class you are to look for.
Personally, I use Crystal DiskMark to test the write-transfer-speed of my cards. http://crystalmark.info/software/CrystalDiskMark/index-e.html
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Click to collapse
Thanks I know the speed rating and how they are tested.
I'm not going to be putting a swap on the card or doing apps2sd, it's a Rogers Magic doesn't need either.
Thanks for the link to the speed test, didn't have one.
Does your class4 card give you any troubles at all or have you found it to be up to pare in all your storage needs? Thanks for the reply.
Clinton

Clinton, I mostly use the spare ion for simple photo taking, jotting-down notes and listening to podcasts (via meridian)/streaming radio (via stream furious) in my car. I haven't ever had any problems with it's speed.
I've had the stock 2gb in it for about 2 weeks, then a kingston 6GB class 4 in it for about a month and just this afternoon, picked up a polaroid 8gb class 6 (for $17.99 from Fry's Electronics - in-store).
the only time I have really had any problems with the speed of microsd card was when using them on my DS through r4 or supercard flashcarts. but that was back when 2gb microsd was just hitting the market (that 2gb kingston microsd from verizon was $99. in the USA, verizon was the first to publically sell this size card)
I generally try to stay away from class 2 cards just as one would try to stay away from USB 1.x devices.
without installing any additional software, a quick and simple test to check if the card is quick enough for heavy usage on your phone, might be to test if Vista/Win7 will accept it as ReadyBoost Compatible.

SD Card Class 2 - 4 - 6 - Make a difference?

Ok I know everyone has stated that the higher the class, the better the performance of Android on the HD2. Because as of now NAND has not been officially been completed, my understanding is the fact that a Class 6 sd card would be next closest thing.
I have a Samsung vibrant as well & there are virtually zero lags in games & applications. Yes I know Im comparing a Nand system to an SD card system, but hear me out.
On the current HD2/Android Build im running (Desire Sense Blue Topia) I've noticed while playing angry birds, there is some screen lag. I've also noticed this in the app drawer.
Now I know that NAND would help with performance and battery life, but I just wanna find out...
Is there anyone that was running a class 2 sd card, then upgraded to a class 6? And did you actually notice any differences?
Faster booting, less lag on apps, overall smoothness? Or is this just an old wives tale?
Thanks.

Class make no sense but read and write speed do.

I switched from Class 4 to 6, not much differences

But theoretically Class value should make sense, because it tells about the >minimum< write speed a card has.
* Class 2: 16 Mbit/s (2 MB/s)
* Class 4: 32 Mbit/s (4 MB/s)
* Class 6: 48 Mbit/s (6 MB/s)
* Class 10: 80 Mbit/s (10 MB/s)
Olioaglio

Olioaglio said:
But theoretically Class value should make sense, because it tells about the >minimum< write speed a card has.
* Class 2: 16 Mbit/s (2 MB/s)
* Class 4: 32 Mbit/s (4 MB/s)
* Class 6: 48 Mbit/s (6 MB/s)
* Class 10: 80 Mbit/s (10 MB/s)
Olioaglio
Click to expand...
Click to collapse
Whoa class 10! I didnt even know it existed.
Heres a listing...
http://cgi.ebay.com/Kingmax-8GB-Mic...emory_Cards&hash=item19c0adc2cf#ht_3119wt_905
Thats amazing.
Anyways, Ok so tonz said he went from 4 to 6 and didnt notice a difference.
How about from 2 to 6? And were you running the same build? Same set CPU processor speed?

Olioaglio said:
But theoretically Class value should make sense, because it tells about the >minimum< write speed a card has.
* Class 2: 16 Mbit/s (2 MB/s)
* Class 4: 32 Mbit/s (4 MB/s)
* Class 6: 48 Mbit/s (6 MB/s)
* Class 10: 80 Mbit/s (10 MB/s)
Olioaglio
Click to expand...
Click to collapse
But one thing to note ... the trade off of higher speed is higher power consumption.

EyeAndroid said:
Whoa class 10! I didnt even know it existed.
Thats amazing.
Anyways, Ok so tonz said he went from 4 to 6 and didnt notice a difference.
How about from 2 to 6? And were you running the same build? Same set CPU processor speed?
Click to expand...
Click to collapse
The same question , i used class 2 , and now , need i used class 4 or 6 or 10

Well i went from class 2 to class 6 and i didnt really saw a difference. Everything was the same, same setcpu speed, same all.
I doubt it worth the upgrade.

I can remember that someone said that the internal sd card controller has a speed limit. for sure class 6 gives higher permanent trasfer speeds than class 2. I have no idea what happens if you access many small files. usually the controllers dont reach that high transfer with small blocks.

I moved from a sandisk class 2 to a trancend class 6.
Boot is faster. Other than that, there is not a huge difference (same quadrant results)

The only difference in speed is seen when there is a lot of writing and reading done. Normal operation of android wont see much difference as it all loads into ram and runs from there. Playing games, etc won't see a noticeable speed boost with different class cards or even nand. Once the app is loaded, it's running from ram. Nand and higher class cards will help to boot quicker and with certain operations that require a lot of reading and writing to the os data file... I don't think most will notice any difference in speed.
Sent from my HTC HD2 using XDA App

Yeah, I borrowed my GFs class 6 4GB and tried it for a day.
No difference for me whatsoever.
If anything, I would say the class 2 gave me better stability.
(Had some force closes and shuch with the class6 ).
My .02

bouaroudj said:
I moved from a sandisk class 2 to a trancend class 6.
Boot is faster. Other than that, there is not a huge difference (same quadrant results)
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That's exactly what I did. Unfortunately Transcend class 6 is slower...
EDIT: I was mistaken, 8Gb Sandisk was alsdo Class 6. See other post to see some testresults

don't know about you guys but changing the class from 2 to class 4 brought back SOD bad...extremely bad

kingston class 10 hdsd micro sd card
well as far as testing my class 2 16 gb sandisk hdsd micro sd card to my kingston card stated in the title i can say there is a very big differnce to me speed wise everything seems to transfer faster load faster and as far as videos and music i keep stored on there i must say comparing the two the class 10 is by far the best thats just my 2 cents

the access time make difference. the speed not .

Hello Everybody, I just want to share my experience regarding the micro sd card. Since i got my my TMOUS HD2, it came with the stock sandisk 16gb class 2 card. i have been using it since the day hd2 came out (late March 2010), i was using it mainly for my Android, but the card just not running stable, i keep getting SOD's on different android builds, lags and slow reading of the card. Well 2 weeks ago i decided to replace my Micro SD car to 16gb Class 10. I saw a HUGE improvement, the Android boots super fast, also not experiencing any lags nor SOD's. so my conclusion is the higher class of the card makes a HUGE difference, it makes your ANDROID runs smoother and stable on your HD2. I am very Happy
As you all notice i don't have many post here, but i just want to share my experience, Thanks to all the people who are involved in making our HD2 a one amazing phone, more power.

I don't think it'll make a difference from the speed of the card I believe its the allocation size of each card. I tried it on a 32kb allocation when formatting and it ran well. Right now I'm on 64 and seen slight improvements but the builds are still unstable or the same. Just slightly better performance. I used a class 10 card and it was okay but my experience has no credibility because I just jumped to a hd2 from a Nexus. Stupid I know but the screen trade off make its worth it because I do alot of reading and video watching. But we'll see how my expirements go.

I went from a class 2 to a class 10 and I didn't notice and difference

I went from a Sandisk Class 2 16gb to a Samsung Class 6 8gb and there was a noticeable difference.

[Q] SD Card Class Question

Ok.... So I have a 32gb Class 4 SD Card. When I went from the stock 16 class 6 card I noticed a speed difference... And well.. It has finally got to me... I am looking at going class 10 but I am wondering if anyone has done an upgrade like this and has any input.
I understand the class number is directly related to the speed in mbps but I guess what I am really curious about is will the epic write/read the card at faster speeds (than 6 [which is stock]) reducing my lag spikes in applications, pictures (taking and viewing), and in gallery 3d(While creating thumbnails [I have noticed this has slowed down the MOST])
For anyone who is interested I am looking at getting this SD card (Please note that I have nothing to do with this seller on amazon and am purely asking for opinions)...
amazon /Patriot-Signature-MicroSDHC-Memory-PSF32GMCSDHC10/dp/B004H8FTCU <----- Insert .com
Again I do know the pure fact that a class 10 offers more speed than class 6 and 4 but is the epic capable of using that speed?
Thanks in advance!

I don't know if our hardware will push the speeds of a class 10, that's not saying you cant use it, just saying you likely won't get those speeds out of it. Most of the time you can't get that much out of one even if the hardware will support it. I'd be willing to be 60% of cards out there are over classed or numbers are inflated from actual production chips.

"Stock card" was a Class 6? My launch day Epic came with a Class 2...

crzyrider250 said:
"Stock card" was a Class 6? My launch day Epic came with a Class 2...
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Click to collapse
My 3 month old Epic also came with a Class 2. LOL - popping it out with the phone running caused my Phone to reboot (Bonsai).

Kcarpenter said:
I don't know if our hardware will push the speeds of a class 10, that's not saying you cant use it, just saying you likely won't get those speeds out of it. Most of the time you can't get that much out of one even if the hardware will support it. I'd be willing to be 60% of cards out there are over classed or numbers are inflated from actual production chips.
Click to expand...
Click to collapse
Yes. Our hardware can. I have done tests transferring files from my computer to the USB card via my phone and it is extremely fast. Camra speed has also dramatically increased if you are taking HD photos. Camcorder speed also increased. But I was going from a stock class 2 16gb that came with the phone to a class 10... So coming from a Class 6, I dunno how much of an increase that would be.

Class of SD card

Did my Mango update fix the "class" issue for Micro sd cards. Can I use a class 10 card now?? Or is this a DVP issue?

slight22 said:
Did my Mango update fix the "class" issue for Micro sd cards. Can I use a class 10 card now?? Or is this a DVP issue?
Click to expand...
Click to collapse
The class is not a DVP specific issue. It's a MS WP7 OS level issue/limitation. Class 2/4 is the max recommended (not by MS, but by user experience).
Read here for details on the card class.

Has anyone ever tried a class 10 just to see if it would work? I only ask because i can buy a class 10 for only 10 dollars more than a class 4.

slight22 said:
Has anyone ever tried a class 10 just to see if it would work? I only ask because i can buy a class 10 for only 10 dollars more than a class 4.
Click to expand...
Click to collapse
I would save the ten bucks and get something that's more widely accepted to work.
FWIW a Class 10 is only worthwhile if you're constantly dragging heaps of files (or big files) backwards and forwards onto/from it.
The Class signifies the sequential transfer speed. Manufacturers tweak the random access times to boost sequential throughput. Random access times are things like saving camera photos to the SD card, loading the gallery, loading the music collection, running Apps from SD etc.
You will sacrifice everyday 'zip' to gain good throughput for big file transfers. Class 10 cards, to me at least, are just not worth the trouble. I'd rather have good speed in everyday tasks than good speed doing a card dump back and forth. YMMV of course

juzz86 said:
I would save the ten bucks and get something that's more widely accepted to work.
FWIW a Class 10 is only worthwhile if you're constantly dragging heaps of files (or big files) backwards and forwards onto/from it.
The Class signifies the sequential transfer speed. Manufacturers tweak the random access times to boost sequential throughput. Random access times are things like saving camera photos to the SD card, loading the gallery, loading the music collection, running Apps from SD etc.
You will sacrifice everyday 'zip' to gain good throughput for big file transfers. Class 10 cards, to me at least, are just not worth the trouble. I'd rather have good speed in everyday tasks than good speed doing a card dump back and forth. YMMV of course
Click to expand...
Click to collapse
I kinda knew what the differences was, but thank you for the refresher
I actually did buy a class 4 card here yesterday and it should be here tomorrow, or amazon says. But i was more asking to see if it had been done.
Thx

slight22 said:
I kinda knew what the differences was, but thank you for the refresher
I actually did buy a class 4 card here yesterday and it should be here tomorrow, or amazon says. But i was more asking to see if it had been done.
Thx
Click to expand...
Click to collapse
Lol, sorry mate. I may have misinterpreted your question a little!
Appreciate the 'thanks' though!

I'm using a class 10 card, no issues so far fixed all the problems that I had with the original one plus it's much faster

[Q] Fastest SD class atrix can use?

I'm finally getting to the point where my internal card is filling up, and looking to get a 32Gb Microsd, but would like to get a decent one. What i want to know is, what is the fastest speed the Atrix can transfer data at? For example I dont want to get a class 10 if the fastest the Atrix can transfer is at a 4, just to keep cost down.
Thanks

I have Samsung 32GB class 10 and it works about declared speed.

A class 10 would definitely work however i would personally not shell out the extra dough just for a little faster transfer speed.
High class sd cards are really aimed at professional cameras to have speedier photo shooting.
However some olders phone that have mods that mount their filesystems on the external sd (to bypass the small internal memory) made everyone want the fastest sd cards to get a little increase in performance as a side effect.
Seeing this is not the case for the atrix a normal card would do well enough in 99% of the cases.
Sent from my MB860 using XDA App

I disagree. If you use your card for media, as many do, the transfer speeds do matter. You'll cut your transfer times more than in half with a Class 10 over a Class 4...

ehvio said:
I disagree. If you use your card for media, as many do, the transfer speeds do matter. You'll cut your transfer times more than in half with a Class 10 over a Class 4...
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Click to collapse
I agree. Transferring a lot of pictures, music, movies... does matter. Also, better cards is useful for HD recording, loading data, games content... and price is not that higher.

thank you all, class 10 it is then, since amazon have some very reasonable deals this week!

While what you guys have said may be true, i still personally did not feel much difference.
For example my class 4 sandisk would write at 8 (or more sometimes) and read much higher than that. Also, i never really found myself in such a hurry when transferring things that the 2-3 mbps would make the difference.
I've also heard of a few cases where my friend's class 10 would go corrupt or randomly deleted but i assume this has more to do with the brand more than the class, i never stray away from sandisk and never had these kind of problems, a personal recommendation if you will.
Sent from my MB860 using XDA App

Previously I had Apacer class 4 with terrible write and bad read performance so Samsung class 10 make a huge difference

Ya I just switched to a 33 gig class 10 from a 16 gig class 4 and it was worth every penny I transfer a lot of music to and from phone as well as pictures and it made a world of diffrence
Sent from my MB860 using xda premium