yashsingh1/xdaforums huggingface dataset:
[General Accessories] MisterMonitor:
"I have HTC Desire. It was really hard for me to choose between cards. I decided to go for sandisk 32gb, but now dont now which class should i buy. I was planning about sandisk mobileultra 32gb class6, but if you say that lower class cards are faster in running apps i got a little bit confused :/.

And if you guys now better variants than this sandisk mobile ultra, please write . I will be really grateful ."

So i read a little bit more. I find one interesting thing : random speed. That random speed is most important for smartphone. People write that class 2 or class4 will perform faster than class6 /class10. So Im more confused now. I was thinking of buying 32gb class 6, but is really 32gb class 4 best solution for smartphone?

---------- Post added at 03:25 PM ---------- Previous post was at 03:05 PM ----------

"Class 2 and 4 cards have better random access speed and random read/write than class 6 or 10 cards in general"

BUT here :

Class4 random :

Random Read 4KB (QD=1) : 3.234 MB/s [ 789.5 IOPS]

Random Write 4KB (QD=1) : 1.467 MB/s [ 358.2 IOPS]

Random Read 4KB (QD=32) : 3.164 MB/s [ 772.4 IOPS]

Random Write 4KB (QD=32) : 0.150 MB/s [ 36.5 IOPS]

Class6

Random Read 4KB (QD=1) : 5.356 MB/s [ 1307.5 IOPS]

Random Write 4KB (QD=1) : 0.052 MB/s [ 12.7 IOPS]

Random Read 4KB (QD=32) : 5.484 MB/s [ 1338.8 IOPS]

Random Write 4KB (QD=32) : 0.058 MB/s

Isnt random read speed is more important for smartphone to operate apps and games from sdcard ??
[General Accessories] cajunflavoredbob:
Random speed is better for short reads and writes on the SD card. This generally makes playing games and using other applications speedier on the whole when they are stored on the card. Sequential write speeds are more handy for shooting HD video and taking lots of pictures. The faster the card is, the less time teh device spends processing and waiting for the data to transfer from RAM to the SD card.
[General Accessories] MisterMonitor:
Thank you for information :) .

I dont like it :( , its sucks that higher class is not better in all ways.

But then, why people here in xda keep saying that class4 is better than class6/10 in using applications, you say that it depends on random read speed. We see that random read speed is higher in class6

class6

Random Read 4KB (QD=1) : 5.356 MB/s [ 1307.5 IOPS]

Random Read 4KB (QD=32) : 5.484 MB/s [ 1338.8 IOPS]

vs.

class4

Random Read 4KB (QD=1) : 3.234 MB/s [ 789.5 IOPS]

Random Read 4KB (QD=32) : 3.164 MB/s [ 772.4 IOPS]
[General Accessories] cajunflavoredbob:
Card manufacturers sacrifice random speed in order to gain sequential speed boosts in their cards. This generally means that the random speeds get slower as the sequential speeds get higher. The speeds vary depending on the card reader, PC, and card manufacturer. There isn't just one card to rule them all. You have to find out for yourself which card is better for you.

Random speeds are even more critical in WP7 devices, which need a very high random speed to use the cards properly. In Android and other operating systems, you need to decide what your primary use for the card is. If you are looking to take lots of HD video, pictures, or watch lots of movies on your device, then a higher class card is much better for that. If you mostly just play games or use apps, then a lower class card is better for you.

As I mentioned, not all cards will give you the same results as others who have posted here. I use Class 4 SanDisk cards as I have a HD2 that I use for running WM, Android, or WP7 depending on how I feel at the time. Running WP7 at all requires that I have high random speeds, so I have to use a low class card anyway. Even on Android, I store most apps on my SD card, so a low class card is better here too. I rarely watch movies or even record video on it. My camera takes decent enough pictures at 5MP that a low class card doesn't slow it down any. Even on WM, that operating system is optimized for lower class cards, since that's what was available at the time.

Anyway, there are 5 classes of cards from class 2 up to class 10. If you want one in the middle, then get a class 6. This is just going to give to low numbers in both categories, though, so I would suggest getting either a class 4 or class 10, depending on what you do the most.
[General Accessories] MisterMonitor:
Thank You ! I very apreciate your help. Your posts are very useful :) .

It's a link to microsd card random speed tests. There's random 4kb QD=1, 4kb QD=32 and etc. And whats very annoying is that in every random speed test (with different speeds(512,4kb) and different QD's: QD=1 or QD432), the same card is in absolutly different position, in one test sandisk is in first position in other test its in 8position and etc. :confused:

http://www.tomshardware.com/reviews/microsdhc-memory-card-performance,3011-12.html
[General Accessories] cajunflavoredbob:
As far as speed goes, you really can't rely on SD cards. Use your best judgement, and make your own tests to see which one you prefer.
[General Accessories] speedracer888:
Samsung Micro SDHC 32GB Class 10

Very helpful thread.

Based on the results from others, I decided to buy the Samsung Micro SDHC 32GB Class 10. I wanted to give back and also share my results. I bought it from Fry's in the U.S. for $49.99.

See screen shots below. I think the performance is pretty good. :)

I tested with (1) an Iogear MicroSDXC USB Card Reader and (2) with my Samsung Galaxy S II attached to my laptop via a USB cable. I'm running Windows XP.

Thanks.
[General Accessories] El Shaddai's Wrath:
Just ordered a 32GB microsdhc class 10 Komputerbay. Will report in with performance once I get it.
[General Accessories] craige:
i am looking for class 6 32/64GB microSD card at good prices..... please if u guyz can share link to sum website where i can purchase it and tht ships internationally.
[General Accessories] MisterMonitor:
Thank You for all information you gave me. I decided to go gor sandisk 32gb class4. It's fastest in running apps/browsing and etc. and class 4 is really enough to run films on your phone, mines now are class2 and it gets job done good when it comes to film wathcing.

Heh, I can wait a little bit more when transfering files between computer and phone, than having a slower phone.
[General Accessories] crayfiss:
Nice! Great post. I'll be better informed for my next purchase
[General Accessories] junkeeroo:
OK, so I bought the Lexar 32GB Class 10 card with about an hour left in a sale to try out at half price...I wish I didn't.

My test results (already posted earlier) speak volumes...I also posted for my Lexar 16GB Class 4 card...

Lexar 32GB Class 10 - Q1 2011 = 1st thumbnail

Lexar 16GB Class 4 - Q2 2010 = 2nd thumbnail

I'm pretty impressed with those Samsung results...I'm on a hunt for that one.

Cheers.
[General Accessories] junkeeroo:
Thanks for sharing this! This looks like the go to for a Class 10 so far.
[General Accessories] Dja357:
Nice work, thanks for this!
[General Accessories] cajunflavoredbob:
Those really aren't very good results. Personally, I prefer SanDisk or Samsung.
[General Accessories] silkshocker:
Fry's is currently having a 32gb Patriot microSD for $19.99 after rebate.
[General Accessories] junkeeroo:
Thanks. You have a link? I could only find $39.99 on the flyer.
[General Accessories] nieohl:
Guys, how about ridata 32gb class 10? i couldn't find Sandisk 32gb class 4 here, but will continue to look for some shops out there.
[General Accessories] dazza9075:
alright there, can you do me a favour and re run those in single pass with a 4000 file? its quite likely that internal cache is effecting such a small file size, if you crank it up to 4000 you'll remove that and also get a better understanding of the average speed, it does look very promising tho! :)
[General Accessories] eng_matt:
32 gb must number 10 , i used team product.
[General Accessories] Enes_81:
You didn't ask me, but since I have the same card I did the benchmark.

The benchmark took veryyyy long but here are the results as a screenshot and as text:

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : [url]http://crystalmark.info/[/url]
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 23.737 MB/s
Sequential Write : 12.610 MB/s
Random Read 512KB : 23.082 MB/s
Random Write 512KB : 11.054 MB/s
Random Read 4KB (QD=1) : 5.309 MB/s [ 1296.1 IOPS]
Random Write 4KB (QD=1) : 0.648 MB/s [ 158.2 IOPS]
Random Read 4KB (QD=32) : 5.518 MB/s [ 1347.2 IOPS]
Random Write 4KB (QD=32) : 0.678 MB/s [ 165.6 IOPS]

Test : 4000 MB [F: 38.6% (11.3/29.2 GB)] (x1)
Date : 2012/01/21 20:03:25
OS : Windows 7 SP1 [6.1 Build 7601] (x64)
SAMSUNG 32GB Class 10 via SD Adapter

Also take a look at my previous posts about this card:

Post 1 & Post 2
[General Accessories] dazza9075:
There we go, so there is a significant drop in write 4k random speeds, which could mean that the cache is very good or that some sectors of the card are much slower, given the class rating its likely to be the former of the two. If my thoughts on IOPS are correct, that should give you enough speed to run WP7 without lockups or lagging, to get the most reliable result your best using a USB cable, that rules out other devices slowing things down, even a HUB will effect the speeds to some degree or other.

thanks for doing that, would be intersting if anyone else with that card could do the same.
[General Accessories] deo_T90:
oh! thank you! :)
[General Accessories] thejackgroup:
anyone test it speed of SanDisk® Mobile Ultra™ microSDHC™ memory cards 32gb ?

i want buy it
[General Accessories] Enes_81:
I don't know if I fully understand what you mean, but this test was done by putting the micro SD in the supplied SD adapter. Then I put the SD adapter in the SD slot of my DELL XPS 15 laptop, I think that is the most reliable result you can get.

The test of my previous post where I wrote "tested by USB cable" were done by putting the card in my HTC Incredible S and then connecting it with my DELL XPS 15 via a USB cable. This is not that reliable because it is limited by my phone hardware, but for some reason the 4K Write is always higher then with a SD adapter.

---------------------------------------

To make my previous test complete, I did another benchmark. This time I did the 4000MB test via USB Cable while the card is mounted in my HTC Incredible S

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 20.052 MB/s
Sequential Write : 10.758 MB/s
Random Read 512KB : 13.818 MB/s
Random Write 512KB : 9.969 MB/s
Random Read 4KB (QD=1) : 1.772 MB/s [ 432.5 IOPS]
Random Write 4KB (QD=1) : 0.438 MB/s [ 106.9 IOPS]
Random Read 4KB (QD=32) : 1.995 MB/s [ 487.1 IOPS]
Random Write 4KB (QD=32) : 2.035 MB/s [ 496.9 IOPS]

Test : 4000 MB [F: 38.6% (11.3/29.2 GB)] (x1)
Date : 2012/01/22 13:56:13
OS : Windows 7 SP1 [6.1 Build 7601] (x64)
SAMSUNG Class 10 via USB Cable

See my other posts about this card and don't forget to thank my posts.

100MB benchmark with brand new card.

100MB benchmark after one week (34% filled)

4000MB benchmark via SD Adapter
[General Accessories] lethas:
Wow thank you for information mate.
[General Accessories] J. Cheever Loophole:
Hey there you bunch of chooches!!! How's life, as if i would care? :)))

So, i'm looking for a 32gb card for my xperia mini. The thing is that i will probably buy a phone like the sgs2, or something that is not even on the market yet in a couple years. i love to do photos and videos with my phone and the mini is doing a good job, but i will need something better... So then i would use mini and my second phone and i would use the 32gb card in the new phone.

The questions is:

which class do i really need?

I was trying to google read/write for sgs2, but couldn't find the info. So, how much data can a great phone like the sgs2 write and read in a second? This seams like the best way to see if the card is too slow, or too fast.

Oh, i'm located in croatia and i can't obviously buy it from some very cheap stores that you guys have in the states, so could someone recommend some store which ships to croatia and is safe for buying such stuff? I looked on ebay and there is snadisk 32gb class 2 for something like 15$, but i don't know. looks dodgy to me.

I'm tired now. I'll have a little nappy poo and when i'm back i expect to see a lot of answers :) Hahahaa.

Cheers
[General Accessories] cajunflavoredbob:
Look back in the thread. We've outlined several times which class card to get for your uses. So when you come back from your nap, do a bit of searching, please.
[General Accessories] xm11:
i have 2 pcs sdhc kingston suport galaxgy 1/2 without problem

any table sdhp suport other model smart phone ?
[General Accessories] J. Cheever Loophole:
Hey there little fella :D I'm back and snappy!!! I think i wont buy the 32gb card. i think 16gb will be enough.

I think it will be the samsung class 10. Any objections? Cant find people who say bad things about it. Fast and not expensive. just 10% or so more expensive than other class 4-6.
[General Accessories] chinmayanaokar:
Thanks for the info!
[General Accessories] Xxul:
Sandisk 32gb class four. Got it on amazon when it was 40% off.. it works flawlessly, htc sensation

The class 10 is a too big gamble..

~§~
[General Accessories] AJ06:
Thanks for the suggestions! I was also looking into this.

Sent from my SGH-T959
[General Accessories] junkeeroo:
Some are not Too big a gamble as others have said previously. Both the Kingston and Samsung class 10 cards have tested pretty well for those needing higher sequential write speeds for HD video recording.

by the way, the sensation has 1080 video recording, as well, yes? Any pixelating when video recording?

Cheers
[General Accessories] caiston:
Using Samsung 32GB Class 10 here on Galaxy S2 with no issues.

20GB music, pics & vids so far and camera saves to card also.

Highly recommend it!!
[General Accessories] Xxul:
So u tellin me i made a stupd choice for buying a class four card if i shoot a HD film?

What is the difference, will the video quality be worse?

Sent from derp-mobile
[General Accessories] Xxul:
What about porn? XD

Sent from derp-mobile
[General Accessories] olyloh6696:
You may have a few stutters here and there.
[General Accessories] cajunflavoredbob:
If you are shooting 720p or higher videos, you may experience stuttering in the video as the card isn't rated for high throughput data transfers. I'm not saying that it will happen every time, but that is the reason you should go for higher class cards if that is your main purpose. Higher class cards have higher sequential write speeds, which is what you need for saving pictures more quickly and for recording HD video. Lower class card have much higher random access speeds, which are needed for someone who uses lots of apps.

Also, if you are using a WP7 device, you MUST use a class 2 card. Class four seems to be alright as well, but class two is safer.
[General Accessories] Xxul:
Well its back to amazon then.. could u please link me that samsung class 10 or the kingston one, i wouldnt like to buy a untested card. :/

Sent from derp-mobile
[General Accessories] caiston:
This is the one I bought:

Samsung MB-MSBGAEU 32GB Class 10 Micro SD Card

Copy that into amazon search and it's the first result, can't post a link here at the moment.

As I said it works great for me and I'm sure whatever u wanna store on it will be safe and sound ;)

I even trust it with my nandroid backups!
[General Accessories] Xxul:
Merci beaucoup :)

Sent from derp-mobile
[General Accessories] dream_walker:
thanx for usefull information...sdhc is the best for hd camera recording.but they are expensive now :-))
[General Accessories] Enes_81:
Every micro SD card above 4GB is called Micro SDHC, so I think that you don't know what you are talking about or mistyped.
[General Accessories] cajunflavoredbob:
Actually, there are 4GB SDSC cards. They are extremely uncommon, but some older phones could only accept the SDSC cards. SD version 1.01 allowed for up to 2048 bytes per block, which put 4GB cards on the very upper end. I still own a miniSDSC card that is 4GB, which is for a previous, older PPC that could not accept the SDHC cards.

In any case, I've only ever seen 4GB microSDSC cards manufactured by Kingston. Don't be fooled by the title of that link. If the card is not printed with the SDHC logo, then it is not SDHC. Either the title of that link is wrong, or the picture is wrong. I am more inclined to trust the image as a what you see is what you get kind of thing.
[General Accessories] Two Dogs:
Hi:

I just bought a Lexar 32Gb microSD from Amazon and these are the results .

I also noticed the random read/write speeds improve "slightly " with a much smaller sample Eg: 50mb instead of the 1Gb test which has me wondering if the test sample was even smaller Eg: 1-5 Mb would it increse more ?

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.265 MB/s

Sequential Write : 12.826 MB/s

Random Read 512KB : 19.040 MB/s

Random Write 512KB : 0.905 MB/s

Random Read 4KB (QD=1) : 3.681 MB/s [ 898.6 IOPS]

Random Write 4KB (QD=1) : 0.009 MB/s [ 2.1 IOPS]

Random Read 4KB (QD=32) : 4.057 MB/s [ 990.6 IOPS]

Random Write 4KB (QD=32) : 0.010 MB/s [ 2.5 IOPS]

Test : 1000 MB [I: 0.5% (0.1/29.8 GB)] (x5)

Date : 2012/01/31 13:44:01

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.423 MB/s

Sequential Write : 13.101 MB/s

Random Read 512KB : 19.205 MB/s

Random Write 512KB : 1.589 MB/s

Random Read 4KB (QD=1) : 3.658 MB/s [ 893.1 IOPS]

Random Write 4KB (QD=1) : 0.014 MB/s [ 3.5 IOPS]

Random Read 4KB (QD=32) : 3.918 MB/s [ 956.4 IOPS]

Random Write 4KB (QD=32) : 0.023 MB/s [ 5.6 IOPS]

Test : 50 MB [I: 0.5% (0.1/29.8 GB)] (x5)

Date : 2012/01/31 13:57:20

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)
[General Accessories] :
I've got a 32GB card from san disk, it's working fine... class 10
[General Accessories] s4kura88:
hi..

i'm really confused about this.. can someone give me an advice?

at first, i already decided to buy sandisk class 4 32gb for my galaxy tab 7 plus.

but, the seller then said that class 4 memory card will make my tab laggy.. and he suggested to buy class 10 memory card, because he used class 6 memory card and it still a little bit laggy..

i mean, i probably won't use it for recording and i don't mind waiting a little bit longer for copying files.

what you guys think? which one should i buy?

thanks..
[General Accessories] cajunflavoredbob:
He obviously didn't know what he was talking about.
[General Accessories] akya22:
Thanks for the info.. Damn I am still on 4GB :(
[General Accessories] Xxul:
Are u sure he wasnt apple genius staff? ;D

Sent from my derp-mobile
[General Accessories] s4kura88:
lol. i don't think so.. i mean, when i said about the memory card class 4 have better random speed. He still kind of sure about it. Make me confused. :confused:

btw, do u have any idea about the price of sandisk 32gb class 4?
[General Accessories] cajunflavoredbob:
Do a search on Amazon. Generally they have the best prices on SD cards. Don't buy them from a retail store. You will end up paying about 30-50% more.
[General Accessories] dazza9075:
random access is king unless your talking big files, like photos and videos, guy sounds a plonker
[General Accessories] antmiu2:
nice thread still a bit confused tho...

which are some 16gb and 32gb micro sd cards youd recommend to me??

I will be installing webtop2sd for my atrix but i also have lots of music and would like to output 720p videos to my hdtv through micro hdmi
[General Accessories] cajunflavoredbob:
Decide what is more important to you. You can either have flawless app playback with a lower class card or faster recording and image capture with a higher class card. Just don't try to get the best of both with a Class 6 card. It's actually the mediocre of both... :rolleyes:

Class 2 and 4 are best for smooth apps on your SD card. Class 10 is best for video recording and quick image saving. Choose which one you would prefer and get that card.
[General Accessories] antmiu2:
i dont really record i meant downloading a hd movie (on my pc) then use my new atrix to play it on my hdtv (via mhdmi) ... so i guess a class 4 should be good for me? and would you name some recommended and not recommended brand?
[General Accessories] cajunflavoredbob:
I only use SanDisk, but others in this thread have named other trustworthy OEMs.
[General Accessories] Evo4sickness:
Yo you should also check out Midwest Memory got my 32 Sandisk class 4 for $45 which I still cant believe today I was able to get that price they are on Amazon check them out.
[General Accessories] iphunkz:
omg,,i just trade my class 4 sd card for class 10 sd card...what should i do??huhuhu
[General Accessories] cajunflavoredbob:
You should probably use it, but that's just me.
[General Accessories] Enes_81:
Class doesn't dat anything! Benchmarking does. Which cards are you talking about?

Sent from my HTC Incredible S.
[General Accessories] iphunkz:
okay,,thanks

im using trandscend card... 16 gb class 10 in my optimus 2x...
[General Accessories] hipojarty:
very useful

just want to ask, the higher the R/W makes the card a reliable one? am i right?
[General Accessories] cajunflavoredbob:
Both of you guys should really do a bit of reading in this thread. There is a ton of valuable information in just the last few pages (assuming you have your page count set to 10 posts).
[General Accessories] lea9ue:
Agreed. Thread is very useful.
[General Accessories] xmvr:
Sandisk Class 4 vs newer Ultra Class 6

I'm on the verge of buying either a Sandisk Class 4 or Sandisk Ultra Class 6 micro SD for my mobile. It will be used for apps (all the time), music, and occasionally video.

I'd be interested in finding out if Sandisk have plain traded random performance for sequential in the Ultra Class 6 cards, or if the technology in the cards has advanced, allowing them to offer better sequential r/w without sacrificing random performance. If it's the latter, I can probably justify spending the extra 30% on the Ultra card.

Anyone have any thoughts, or any test results comparing the 2 cards?
[General Accessories] 754boy:
Don't wast your money on an "ultra" card. I got a regular Kingston Class 6 16gb microsd and its been working just fine. Doesn't lag my apps or video. Paid only $15 for it.
[General Accessories] cajunflavoredbob:
I'm with you. I'm not buying into the whole Ultra SD card thing. Regular SDHC is fine for anything you throw at your smartphone. The Ultra ones might be good for cameras, but it's probably overkill for what your phone can actually use. Just because a card is advertised at 100MB/sec, that doesn't mean your phone can actually use those speeds.
[General Accessories] CamoGeko:
The good thing is its driving the SDHC prices down.

Communicated from an SGS2 type Droid while floating in CM9 Galaxy
[General Accessories] cajunflavoredbob:
Yep. I'm watching those SanDisk 32GB prices on Amazon right now. The price is dropping almost every two weeks like clockwork. Class 2 and 4 are both around $30 right now.

Sandisk Class 2 - $30.78

Sandisk Class 4 - $30.84
[General Accessories] MisterMonitor:
Is this one genuine ? http://www.ebay.co.uk/itm/San-Disk-...AsAccessories_MemoryCards&hash=item4ab3348993