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
Click to expand...
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.

What speed is the 2GB stock MicroSD card?

What speed is the 2GB stock MicroSD card the HD2 ships with? (Just to know)
IS Class 2 fast enough? I have a 16GB class two that I'd like to use, but not at the expense of performance on the phone, or problems, etc.
Anyone?

Class II is enough for a phone. Dunno the speed of the inserted one - guess it is class II. I'm using a class II 16GB mSDHC from Toshiba since more than a year and I never faced any problems.

Here I have done two micro SD benchmark using sandisk microSD reader:
SanDisk microSDHC 2GB Classe 2
SanDisk Mobile Ultra microSDHC 8GB Classe 4
The Ultra version has twice the speed of the stock one.

Yeah, that may be right and it could be faster when you copy some files to your phone or pull it down of it. But nevertheless the phone does not need more then class II, because it won't be able to exhaust it.

Even when recording video?

[Q] Micro Sd class 10 or class 6?

I'm looking to buy a new MicroSD and wondering if getting a class 10 over a class 6 would make a significant difference to the phone (if im using data2sd and or apps2sd)
Thank you!

I think the difference between class 6 and 10 would feel minor, where-as the difference between the class 2 and class 6 feels huge.
And since this is the Vibrant forums, I should mention that the internal memory in the phone is very fast. I tested it at over 10MB/s write on my first phone. My second phone its closer to 6 MB/s write. So you apps and stuff should run perfectly fine from the internal app storage.
I should also mention that I purchased the new kingston micro sd thats rated class 4 but claims speeds upto class 10. Upon testing that I got 9 MB/s write. ($28 after $10 reward from buy.com). My previous class 2 16GB card tested it 2.6 MB/s write for comparison.

Shane_pcs said:
I think the difference between class 6 and 10 would feel minor, where-as the difference between the class 2 and class 6 feels huge.
And since this is the Vibrant forums, I should mention that the internal memory in the phone is very fast. I tested it at over 10MB/s write on my first phone. My second phone its closer to 6 MB/s write. So you apps and stuff should run perfectly fine from the internal app storage.
I should also mention that I purchased the new kingston micro sd thats rated class 4 but claims speeds upto class 10. Upon testing that I got 9 MB/s write. ($28 after $10 reward from buy.com). My previous class 2 16GB card tested it 2.6 MB/s write for comparison.
Click to expand...
Click to collapse
Just to help out here...
the difference between class 2 and class 6 is the exact same as class 6 and class 10. Remember the cd-rom speeds (52x, etc)? That's how the speed is calculated for a SDHC card. So a class 2 = 2x cdrom, class 6 = 6x, class 10 = 10x.
whether our hardware has capability to handle what a class 10 can do, that I don't know. I'd definitely advise to get something with more space than a 2GB card though - I'm not sure everyone needs a 32 (personal opinion/long discussion), but I absolutely agree it should be improved upon.

designerfx said:
Just to help out here...
the difference between class 2 and class 6 is the exact same as class 6 and class 10. Remember the cd-rom speeds (52x, etc)? That's how the speed is calculated for a SDHC card. So a class 2 = 2x cdrom, class 6 = 6x, class 10 = 10x.
whether our hardware has capability to handle what a class 10 can do, that I don't know. I'd definitely advise to get something with more space than a 2GB card though - I'm not sure everyone needs a 32 (personal opinion/long discussion), but I absolutely agree it should be improved upon.
Click to expand...
Click to collapse
I understand that, thats why i picked those classes. But my point is that a class 6 card is 3x the speed of a class2 where class 10 isnt even twice as fast as the class 6. So the perceived difference is smaller, even though the technical difference is the same.

I'm still running a class 2 and I've been wondering if this is holding me back on this phone (card was previously in my G1).
Will the lower classes function the same (creating ext2 etc...) it's just a matter of speed? Just wondering if there's anything that simply can't be done with a class2 or even 6 that could be done with a 10.

CapitalM3 said:
I'm still running a class 2 and I've been wondering if this is holding me back on this phone (card was previously in my G1).
Will the lower classes function the same (creating ext2 etc...) it's just a matter of speed? Just wondering if there's anything that simply can't be done with a class2 or even 6 that could be done with a 10.
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Click to collapse
Just cost you more. Do you really need a class 10 for this phone? Avatar is on a card that isnt even a class 2.

Vegastouch said:
Just cost you more. Do you really need a class 10 for this phone? Avatar is on a card that isnt even a class 2.
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Click to collapse
xD What class was the stock sd card?

I only ever see class 6+ cards being used in higher end compact cameras and SLRs.
Putting anything higher than class 6 in a phone your using for apps/music/movies isn't needed and just a waste of money.
I've also seen a lot of people saying the memory card speeds with the galaxy s are bottlenecked right now, so your not even going to get top speeds with a class 6.

Vegastouch said:
Just cost you more. Do you really need a class 10 for this phone? Avatar is on a card that isnt even a class 2.
Click to expand...
Click to collapse
While the card isn't marked, it tests out at just over 4MB/s which would put it in a class 4.
And we should be clear that the class refers to the write speed. A class 2 will read at 10 MB/s just like the other classes. Where you run into issues with class 2 cards is when you start modding or running programs from the sd card. If you use the card for a swap partition or something the write speed now plays a major factor in the usefulness.
If all you want it for is to place your music files on there and listen to them, then a class 2 will be plenty. That was my initial thought when I bought my 1st 16 GB card for my mytouch3g. Then I got into custom roms and found myself limited.

How do you test the speed of the SD card?

What size microsd card are you looking for? If its a 32GB, I have only seen a Sandisk microsd in Class 2. As far as I know there are no higher classes at this time. Hopefully that will change soon. I would like to get all of my music onto one 32gb card.

designerfx said:
Just to help out here...
the difference between class 2 and class 6 is the exact same as class 6 and class 10. Remember the cd-rom speeds (52x, etc)? That's how the speed is calculated for a SDHC card. So a class 2 = 2x cdrom, class 6 = 6x, class 10 = 10x.
whether our hardware has capability to handle what a class 10 can do, that I don't know. I'd definitely advise to get something with more space than a 2GB card though - I'm not sure everyone needs a 32 (personal opinion/long discussion), but I absolutely agree it should be improved upon.
Click to expand...
Click to collapse
This isnt exactly true. with cdroms the X stands for how much faster it would spin in relation to a audio cd. So 1x ment it spun at the same speed as a audio cd. 2x was twice, ext ext. And this was a max speed.
Classes for SDCard stands for the minimum transfer speed. class two is at least 2mbps, class 6 is 6mbps, and so on.

frankencat said:
How do you test the speed of the SD card?
Click to expand...
Click to collapse
google FDbench
it will test the read and write speed as well as operations per second.

I still can't find a 32gb microsd class 10, anyone find one for sale?

Class 10
Class 10 limitation presently is 8 gig for all brands except the Kingston and soon to be released Silicon Power. The Kingston brand never benches as advertised, so they are not reliable from my point of view. Silicon power has been pretty solid on their claims from my testing versus their claims, but I have not yet got my hands on the latest class 10 16 gig, I have been trying to buy for the since 10-1-2010 but not out in USA yet.
Kingston (in my opinion) is rife with false claims and I find their products have always been sub par.
Flashing and alike works better with class 6 over class 2 & 4. So, if you really want more memory the only 32 gig class 6 I have seen advertised (amazon) are: Transcend, Centon, and Komputerbay (what a name?!) 32 gig Class 6
Other than that, we wil just have to wait until they get the algorithm figured out for a micro ad card with that much ram and that fast.

Get the app "sd card speed test" it works ok Im sure there are others as well

I imagine the only reason you would need a Class 6 card or above is if you plan to take a lot of HD video. Apart from that, even a Class 2 is fast enough to keep up with the still camera, not to mention anything that just requires reads, like music or movie playback.
As for running apps off an external SD card, why would you ever want to do that? You can load close to 2GB on the internal app space, which is likely way faster than any mounted external SD card. I feel like an app whore and I'm not even close to using half that space. By the time apps start getting large enough that it's an issue, we'll be on the Vibrant 2 or beyond.

glad that you asked
merrifield69 said:
I'm looking to buy a new MicroSD and wondering if getting a class 10 over a class 6 would make a significant difference to the phone (if im using data2sd and or apps2sd)
Thank you!
Click to expand...
Click to collapse
because I just picked up a 16G class 10 by WinTec last week and it is VERY fast from boot up with 9G occupied from 15G available (wondered 1G gone to? and that is a lot of gone G lol). It was $42 wo tax expensive but so far the fastest.

Whoohoo
mine 16G class 10 tested 2x >8M and 1x >9M write, 3x > 18M read and it was probably so fast that the result said "unknown class" lol. x means 1 run with 2MB buffer setting. Downloaded app call SD card speed tester.

There are now some 32GB class 6 SDCARDS on the markey, and with 2.2 and installing apps to SD that might matter. It might also matter if you have a TON of music and images, as "Scanning SD for Media" would be faster.
You will pay money for the time savings though.

[Q] What memory cards are you using to run android from?

Hi Guys, I'm currently testing the MattC 1.5 build from a generic 4gb microSD card i had lying around and it works pretty well, but i was thinking of buying an 8gb Sandisk Mobile Ultra card to replace it. I would link to the car but i'm not allowed A quick search on google/ebay should bring up the card i want.
Do you think I would notice an improvement in speed with android running from the card?

kingston 8gb sdhc card Chinese bootleg

If your current card is a class 2 and the 8 gb is a class 4 or higher than yes, tou would notice a difference.
Sent from my HTC HD2 running DarkStone HD2Froyo v1

I use Sandisk 16gb sdhc and no problems with running android-of course only proper wm rom.... Not sure which class is the card

my current card is a Class 2 4gb Sandisk, for £17 i might just get the new card and see how it goes. Would you expect an increase in the score on the Quadrant benchmarks?

Sandisk mobile ultra sdhc 4 gb class 6

are these cards definitely class 6 as i have seen various sites saying they are only class 2 but much faster than the class 2 minimums?

I use a Sandisk ultra sdhc 8gb class 6......working great

16gb stock card that came with my tmous hd2, so im guessing its a class2 but everything runs smoothly tho.
Sent from my HTC HD2 using XDA App

8gb A-DATA class 6

Kingstone 4GB SDHC Class 4, working perfectly, but I'm looking for a class 6 card to see the difference in speed

See my signature, working perfectly without lags , I have never seen a SOD.
Sent from my HTC HD2 using XDA App

Hi,
Well, I use since last week a SanDisk 32 microSDhc class 2. Pretty fast in data transfer.
Read somewhere that the class 2 of this 32 GB edition can be compared to class 6 of older micro SD cards.
Had the standard 2gb microSD before, which was sold with the HD2.
Have no issues of speed with SanDisk 32 microSDhc class 2, when it comes to running Android and transfer data.
Recommend it!

generic 16gb class 2

Adata 8g class 6 lighting fast cost $15 running mattc froyo 1.5 fullram

Apacer 16GB SDhc class 4
Working perfectly..

Download SD Card Speed Tester from Market
and test your real speed. Run it three times on each card.
I have Class 2's that are 2's. I have the original 16 gb Class 2 that rates at six and a class 4 Sandisk that rates at a 9. You never know till you test it. Also have a Class 6 that rates at a 9.

8 gig kingstone class 4.
i got a 4 gig class 6 micro sdhc, but i can't notice a difference in speed big enough to compensate the loss of 4 gigs (lots of songs stored).

johnboatcat said:
and test your real speed. Run it three times on each card.
I have Class 2's that are 2's. I have the original 16 gb Class 2 that rates at six and a class 4 Sandisk that rates at a 9. You never know till you test it. Also have a Class 6 that rates at a 9.
Click to expand...
Click to collapse
i have an 8gb class 2 however the test says i have class 4 read/write speeds so im pretty happy

Just got 1544 in quadrant using class 2 sandisk 8gig

Memory Cards (SDHC)

Hi Guys,
I have a strange situation going on here with my micro SDHC cards. I have an 8gb Sandisk card class 2 and I just bought a 16gb Duracell class 4 card as I wanted a bit more space than 8gb for my desire HD (to be arriving soon).
Anyway the 16gb card arrived today in the post so I was bored and decided to do some speed tests on the 2 cards just to check. The class 4 card wrote at 4.1 mb/s which I presume is what it should do...right? How ever the class 2 card wrote at 13.5 mb/s!! I tested it several times with large amounts of data (using the H2testw program) and it kept getting the same results.
So it lead me to think that there is something wrong with my class 4 card (or its a fake). It does write at 4 mb/s but that is the bare minimum and surely it should be doing better? I got it off ebay and am now aware of the extreme amount of fake cards on there.
Anyone with a little experience on the matter care to offer me some insight?
Btw I will be using my phone for pictures and 720p recording so I want a fast card...but after this I am just confused.
Thanks

ccart said:
Hi Guys,
I have a strange situation going on here with my micro SDHC cards. I have an 8gb Sandisk card class 2 and I just bought a 16gb Duracell class 4 card as I wanted a bit more space than 8gb for my desire HD (to be arriving soon).
Anyway the 16gb card arrived today in the post so I was bored and decided to do some speed tests on the 2 cards just to check. The class 4 card wrote at 4.1 mb/s which I presume is what it should do...right? How ever the class 2 card wrote at 13.5 mb/s!! I tested it several times with large amounts of data (using the H2testw program) and it kept getting the same results.
So it lead me to think that there is something wrong with my class 4 card (or its a fake). It does write at 4 mb/s but that is the bare minimum and surely it should be doing better? I got it off ebay and am now aware of the extreme amount of fake cards on there.
Anyone with a little experience on the matter care to offer me some insight?
Btw I will be using my phone for pictures and 720p recording so I want a fast card...but after this I am just confused.
Thanks
Click to expand...
Click to collapse
Your card is just fine. The class of a memory card just tells you how slow it isn't, not how fast it can get.
Class 2 - Minimum of 2 MB/s performance.
Class 4 - Minimum of 4 MB/s performance.
Being a class 4, a minimum 4 MB/s is fine and passes the class 4 classification. But a 13.5 MB/s for a class 2 is great!

in my experience larger cards tend to be slower in real life situations anyway, i have found issues using slower cards so tend to stick with a minimum of class 6 (but then your class 2 exceeds that spec )