yashsingh1/xdaforums huggingface dataset:
[General Accessories] fabe0705:
The one and only refference for sd Cards is sandisk :good:
[General Accessories] Eazz:
Sandisk 32gb rlz!
[General Accessories] macpro88:
The difference between a class 10 and class 4 is not going to be noticed in your phone. The class 10 is for devices that need a faster speed so it clear out the devices buffer faster and write faster, such as HD video recorders that will be used for hours on end or for higher end cameras (no phone cameras, real cameras) that have a faster shooting rate.

Class 4 is plenty fast enough for Android phones, any "difference" you notice will more likely be psychological at best because you "think" that class 10 is faster in an android phone, not matter what bench marks say. Besides, those benchmarks were run on a computer, not on your phone.

Class 4 is plenty fast enough, and keep in mind, data transfer is only as fast as it slowest device, so unless that device has the ability to write that fast to the card, its going to be limited and cause possible issues.

I've more issues with Class 10 cards in phones and multiple phones at that, than anything else. Have yet to have an issue with a class 4 card that was speed/performance related (dead cards do exist, but its not the phones fault).
[General Accessories] Saneless One:
I had the same experience. A class 10 with poor random access speeds caused me to have lag all over the place. A class 4 with great random speeds has been great.

I don't transfer enough large files to care about the file copy speeds.
[General Accessories] tobydjones:
SDSDQU-032G-U46A Sandisk Mobile Ultra 32GB Class 10 Micro SD Card

I was told by sandisk customer services that the "mobile" moniker was a marketing ploy and there was no difference between the cards marked "mobile" and the ones that aren't. It was dropped because it backfired - people with cameras wouldn't buy the card!
[General Accessories] Action1:
so SanDisk 32 GB class 4 would be the best choice for a Galaxy S3 if i dont copy movies and stuff!?
[General Accessories] Kjc99:
I have burned out two 32gb sd cards on my gt-i9300 does anyone know if I'm missing something

Galaxy S3

Omega rom V34
[General Accessories] renx0:
I'd get class 10 if transfer speed from the PC to your phone is something you do regularly. Helpful for cutting down time on transferring larger files.
[General Accessories] asif09ansari:
Thanks for the info dude.
[General Accessories] cickii:
thanks for the info
[General Accessories] tonemgub1:
Since nobody said the Random Write 4KB (QD32) value was to bad I bought the Samsung Class 10 card and its doing its job very good, especially because the noname class 4 card I used before was really bad. If someones interested I could post CDM benchmarks.
[General Accessories] tobydjones:
That would be useful please, thanks. I think the standard here is to run 5x 1000mb, using a card reader, not the phone, if you have one.
[General Accessories] baffobaffone:
Trend very interesting thanks for the info
[General Accessories] tobydjones:
Just a note of caution... I've tried two SanDisk 32g class 10 (UHS-I) cards, and had problems with them disappearing from windows half way through testing (verified genuine cards by SanDisk) even though they worked on my phone
[General Accessories] mulunix:
thanks for share :good:
[General Accessories] _HIM_:
very good :laugh:
[General Accessories] cyraxx84:
Hi people. I'm a noob when it comes to sd card's so i was lucky to find this thread coz i need a bit help. About 1 year ago i bought a 32GB Lexar class10 but now i was reading in OP that this is one of the worst(****). My Phone's a SE XperiaPlay so the main priority lies on gaming and i thought it should be atleast 32 GB big and should have fast read speed, that's why class 10. I know that to change read ahead cache size can improve this. So the problem is every time i do a test the results are totaly different and they're also different from testapp to testapp. Last time i tested it i tried just with Antutu B. and the first result was for me unbelieveble high(19,0mb/s read and 13,8mb/s write) next test drops the results more than a half. If used an app called Sd-tools i got sometimes read speeds over 35mb/s (why so different??? or could that really be???)

So can anyone suggest the best method or app to test my sd card or atleast a very good sd card for gaming with good and constant speeds.

Regards and thanks in advance.
[General Accessories] teachmeluv:
Thanks
[General Accessories] Gregerg:
SDSDQUA - "For mobile devices"

SDSDQUI - "For cameras"

Does anyone know if these two Sandisk Ultra microSDHC models are the same? The only difference I can see from the product description is that the "A" models come with some dubious Sandisk backup software. Spec-wise they are alike and the bundle seems to be the only thing that is different.
[General Accessories] m1ghtysauc3:
I need to get a 32gb card for my TF300. Thanks for the recommendation.
[General Accessories] tobydjones:
When I rang Technical Support at SanDisk to ask about cards, this is what they told me. The guy I spoke to seemed knowledgeable, but of course this info might be incomplete or maybe just his understanding of the situation...

First up, "Mobile Ultra" and "Ultra" are the same card, the name difference was just for marketing purposes, to show people the card could be used in mobiles. However the plan backfired and people thought they couldn't use "Mobile Ultra" in their camera, so the name was dropped.

To decipher the codes such as SDSDQUA-032G-U46A:

SDSD=sd card

Q =class 4 (black) available in 2,4,8,16,32GB

QY=class 6 "Ultra" (red & grey) available in 4GB (8,16,32gb discontinued but still on sale)

QU=?

QUA=class 10 "Ultra" 8,16,32=SDHC 64=SDXC* (UHS-I = UHS class 1 = 10mb/s #)

QUI=class 10 "Ultra" apparently "designed for cameras" and NOT the same card (black packaging)

-000G=GB

-U46=EU packaging@

-A11=US packaging@

-FFP=Amazon frustration free packaging@

A=picture of android on package

NOTES

* Compatible devices only

# If used in a non UHS-I compliant phone, it will revert to class 10

@ If it doesn't have a code at the end, it's not covered by SanDisk warranty
[General Accessories] Estal.hun:
UHS support

Hi

is possible to found any device supports UHS?

Or UHS is PC and card reader only feature?

Thanks
[General Accessories] bogdan1980:
S3 support uhsi, i think.

I dont understand the fuzz about crappy sandisk thing, in memory industry Samsung is the thing. Any top gpu card use Samsung.

I bought some samsung 16-32-64 microsd, i see 8-10 write speed on 4k on these, and 20-30 mb on write on S2 and S3 phones.

Now tell me what any crappy sandisk make at 4k write speed?
[General Accessories] tobydjones:
Do you have a model number for a 32gb card please? Any CDM results?

---------- Post added at 11:12 AM ---------- Previous post was at 10:58 AM ----------

A quick look on Amazon throws up two cards, with different 4k results, neither as good as your model, so a model number would be very useful please:

CARD MODEL 4k/1000MB
Samsung 32GB Class 10 KB_SAMSUNG_32GBCL10_TF 0.02
Samsung 32GB Essential MB-SSBGAEU 0.685
[General Accessories] bogdan1980:
Go to Samsung site, look for uhsi models, 70mb read 20 mb write. Samsung does not have thousand models.

This is one of them, the largest

http://www.amazon.co.uk/gp/aw/d/B009HPFUGI

On s2 i see 17 mb write, on s3 25 mb write, on usb 3.0 hub i see 29mb write, 95mb read.

Galaxy powered by GM and Dorimanx
[General Accessories] asrulezyo3213:
Thanks. What are your opinions of the newer 64gb cards? Class 10 64gbs get expensive, but it should work with my phone, not sure though.
[General Accessories] cajunflavoredbob:
You can reformat 64GB microSD cards into Fat32 format that your phone can read if it is an older device. Only newer devices from the better part of 2012 have native support for the 64GB cards. All others need the card reformatted to be able to read it.
[General Accessories] bogdan1980:
My opinion is this, if you have money buy 64 gb only samsung uhsi 70/20 mb model. If not, buy 16 or 32 gb same 70/20mb.

I never see 8-10mb write speed on 4k on ANY microsd till these new samsung models.

I love them.

I even have an 32 and 16gb samsung class 10(not uhsi) and this one has very good speed compare to kingston,sandisk,team,etc.

I just love that samsung finally enter on retail flash memory, not only oem.

I don't trust all samsung products but at ram they are the best.

And regarding class 10 normal or uhsi, on class 10 normal microsd i see 2-5 mb write at 4k, and on uhsi i see 8-15mb depending on device, USB 2.0 or 3.0, etc.

Galaxy powered by GM and Dorimanx
[General Accessories] SharpnShiny:
Hi, I'm trying to get the best read and transfer speed (via USB) for my Android phone.

I'm currently using a class 4 32GB, currently with 26GB of audio. I have 8GB phone storage and all app data is stored there, not on the SD. For the purpose of quick music load and transfer (Android is so slow vs. iOS) should I stick with class 4 or go for class 10? The first post says higher is not always better.

Thanks
[General Accessories] bogdan1980:
IOS is just as slow as android, i use iphones for years.....in fact is slower because of that crappy itunes,the need to use itunes on all content you have. I hate itunes. I need to see and use my drives on phones without itunes.

Galaxy powered by GM and Dorimanx
[General Accessories] SharpnShiny:
Do you or have you owned an iOS device? I still have my iPod classic (and owned many Nanos) and I tell you it syncs *mighty* fast! :victory: It could add about 10 new songs to the device in about 10 seconds or so, syncing 26GB takes about 90 minutes. With different Android phones that I've used it takes almost 1 minute for 10 songs to sync and about 3 hours for my whole collection to sync. :eek:

Whatever rocket cable you're using, I want it! :laugh:
[General Accessories] bogdan1980:
well i m an apple fan, i have iphones from first model to 4 and 4s, ipod 4, etc,etc.

Maybe you have an bad card, try an Samsung:))

I upload an picture with 2 16gb samsung card( the speed is identical with 32gb versions)

in the left, uhsi model class 10, in the right class 6 normal card.

i have maybe 10 samsungs cards from 4gb to 64gb, from what i see is this:

on newer cards from 2011-2012 the only difference between class 10 uhsi and class 4-6-10 normal card are at write speed, normal cards has lower write speed with

10-30% at most. ( on USB 2.0 or in phone).

If i use USB 3.0 the speed on uhsi is incredible, like 95mb read:))

In normal phone the differences are small between Samsung( im not talking about ANY flash maker, only Samsung).

They seems to have incredible flash memory on all their range.
[General Accessories] sembre:
See
[General Accessories] tobydjones:
Would you mind running the test at 1000mb please, at that seems to be what everyone uses to compare cards, just takes a bit of time to run I'm afraid :(

I know Samsung don't have a huge range of cards, but could you verify the model number please, as they do change all the time.

The card looks great, just don't want to take chances after a few duff SanDisk cards I've had to send back!

Thanks
[General Accessories] bogdan1980:
Im away from pc.... Maybe in an few days.

Edit, that 16gb class 6 is msagb.

Galaxy powered by GM and Dorimanx
[General Accessories] stonewash:
Nice post.. Thank u...
[General Accessories] bogdan1980:
16 gb class 6 is mb-msagb/eu_f.

16gb uhsi class 10 code is mb-mgagb/eu_b. “eu “ stand for Europe. Tomorrow i will post 32 and 64gb codes.(uhsi class 10).

Galaxy powered by GM and Dorimanx
[General Accessories] Gregerg:
The QUI class 10/UHS-1 cards that I see in vendors are also available in the exact capacities and ratings as the QUA cards. I wonder what could be different about them.
[General Accessories] bogdan1980:
I move yesterday games on sdcard for the first time, they are playing nice from sdcard no lag, no slowdown. Batman, nfs shift, gta 3 and vice.

I was havin an problem when phone crash, force.restart and sd content was gone. I format again the card on pc, now is ok.

If you play something from card and phone freeze, after restart sd is not seen from phone, and you need to format it on pc.

Galaxy powered by GM and Dorimanx
[General Accessories] tobydjones:
The rating given for cards is only a 'guaranteed' minimum for the sequential write speed (of interest for writing large amounts of data, like photos). It doesn't actually tell you what the card's capable of, and, more pertinently for phones, doesn't give any indication of the 4k random write speed, which is what is important for running apps.

In the past higher sequential speeds equated to lower random speeds, which is why class 10 cards weren't any good for phones, but the latest cards from SanDisk and others seem to have solved this somehow and have high speeds for both sequential and random. It may be that the QUI card is tweeked for photos, but without running CDM on each card, there's no real way of telling the difference between them.

(And please note that you'll get different results from CDM for the size of data that's being written - most useful is a 1000mb data size. Trouble is people tend to drop the data size to 50 or 100 as it's a quicker test, but that bumps up the results, so you can't compare them)
[General Accessories] 1slow4G:
Great info. Just ordered an authentic 32 c4 sandisk last night. Hope it works well.
[General Accessories] bogdan1980:
Pls post an benchmark

Galaxy powered by GM and Dorimanx
[General Accessories] Quickpaw:
SanDisk is my standard

When they are on sale (and I'm in the market for them), I usually go with SanDisk cards first. They seem to be stable for the most part.

I did have a issue with a SanDisk card that came with my Droid X (SanDisk Class 4...8gig?). It started to corrupt images and videos. Formatting that card was only a temporary fix...within a week, random corruption started to happen. Once I swapped it out with another SanDisk (16gig Class 4), everything ran like clockwork.

Tip from me: Whenever you buy a new SD card, test it as much as you can right out of the box. Take test videos/images, transfer files, etc. You'll quickly find out if any problems arise and send it back for a replacement.
[General Accessories] tonemgub1:
Samsung Class 10 microSDHC CDM Benchmarks

Here are the CDM Benchmarks for Samsung Class 10 microSDHC (Model: MB-MSBGA). I did three runs, 5*50/100/500mb and as the first two showed nearly the same results here are the screen shots for 100 and 500mb since they differ, but in the range that you could already see in the table.
[General Accessories] tobydjones:
It's great you gave us the model number as well as CDM benchmarks... but could I possibly ask you to do a 1000mb test, as that seems to be what everyone uses to compare models (eg http://forums.whirlpool.net.au/archive/1582172 - the list the OP referred to). Yeh, takes a while :(
[General Accessories] bogdan1980:
MB-MGCGB/EU and MB-MGBGB/EU ( these are the codes for 64 and 32 latest uhsi 70/20 sammy gold)

i put one 16gb class 6 into an crappy cheap chinese tablet, hook it to pc and this is the result.

with sdtool on that chinese crap i see 12mb write, 22 mb read on this 16 class 6.

and from what i see on google people test their flash at 50mb with crystal, not at 1000.....But as you see at 1000mb the speeds are slower.

latter tests to come.
[General Accessories] lolonne:
thanks man. usefull indeed:good:
[General Accessories] bogdan1980:
At 682 post i see some quite low resuly at 4k, 0.7mb. I think that are old old Sammy series. None of my Sammy has such lower results.

If you want to be on the right side, buy only 70/20 models, or buy any new from shop, not second hand.

32 gb class 10(not uhsi) in Romania is 30 bucks.

Galaxy powered by GM and Dorimanx
[General Accessories] alvinhoe7291:
Sandisk for the win.

cheap. reliable and effective. lol
[General Accessories] bogdan1980:
In Romania an 8 gb micro sandisk is 2-3 times more expensive then sammy. And sandisk is toshiba inside just like kingston.

Galaxy powered by GM and Dorimanx
[General Accessories] nstarz:
I gotta get the suisho shizuku crystaldiskmark later.

This is a Patriot Memory 32 GB Class 10 MicroSDHC Card.

One is through my cell phone, to usb cable. The other one is via a USB Adapter. I wanted to see if there was any differences.

It looks like a mid level card huh?
[General Accessories] devilboy23:
in my place it is rare to get 32gb msd card at lower price, so i am still stuck with 8gb class 10. I get decent r/rw speed from it.
[General Accessories] cognus:
what ver. android are you running?

---------- Post added at 09:29 AM ---------- Previous post was at 09:22 AM ----------

if this is redundant I apologize in advance: searched for this but no results in the thread.

there is chatter elsewhere about 4.2.x having issues with Class 10 cards. what's the story on that? what changed?
[General Accessories] bogdan1980:
Zero problem on Android 412 or 421. That Patriot is crappy, try an Sammy.
[General Accessories] cce10:
My Lexar Class 10 has been flying for 2 years, no problems at all.
[General Accessories] android4temo:
This is some great info. I will definitely pass this on to my buddies that have devices that use external storage. Thanks!
[General Accessories] rmaltempo:
I wish I had read this thread before buying another card (since my old one died). THANKS!
[General Accessories] avegalf:
Sandisk 32 gb class 10 and I think it's very good with my S3
[General Accessories] 1slow4G:
Sandisk 32gb class 4. No problems here

Sent from my Galaxy S3 using neighbors wifi :P
[General Accessories] Didcupcakes:
Sandisk 32gb class 4. No problems too
[General Accessories] nstarz:
Gingerbread.FC.09 on Samsung S1 (Sprint Epic 4G)
[General Accessories] nstarz:
Samsung 16gb class 4

Something must be wrong with the 4k QD32 write :(

Tested with USB adapter.
[General Accessories] nstarz:
patriot 16gb class 10

Well, this one is not good to use.
[General Accessories] kecek:
I must get one this for my Gnote2....thanks for info.....thanks :)
[General Accessories] dei.andrei98:
I'll also get a Sandisk 32GB class 4. Thanks for the info..
[General Accessories] geulari:
good job

Amazing
[General Accessories] nstarz:
-----------------------------------------------------------------------

CrystalDiskMark 3.0.2 Shizuku Edition x64 (C) 2007-2013 hiyohiyo

Crystal Dew World : http://crystalmark.info/

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

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

Sequential Read : 20.685 MB/s

Sequential Write : 7.837 MB/s

Random Read 512KB : 20.443 MB/s

Random Write 512KB : 3.765 MB/s

Random Read 4KB (QD=1) : 4.134 MB/s [ 1009.3 IOPS]

Random Write 4KB (QD=1) : 1.631 MB/s [ 398.1 IOPS]

Random Read 4KB (QD=32) : 3.994 MB/s [ 975.2 IOPS]

Random Write 4KB (QD=32) : 1.954 MB/s [ 477.1 IOPS]

Test : 50 MB [G: 0.0% (0.0/29.7 GB)] (x1)

Date : 2013/02/14 12:03:11

OS : Windows 7 Professional SP1 [6.1 Build 7601] (x64)

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

CrystalDiskMark 3.0.2 Shizuku Edition x64 (C) 2007-2013 hiyohiyo

Crystal Dew World : http://crystalmark.info/

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

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

Sequential Read : 20.279 MB/s

Sequential Write : 9.677 MB/s

Random Read 512KB : 19.863 MB/s

Random Write 512KB : 1.604 MB/s

Random Read 4KB (QD=1) : 3.889 MB/s [ 949.4 IOPS]

Random Write 4KB (QD=1) : 1.473 MB/s [ 359.6 IOPS]

Random Read 4KB (QD=32) : 3.743 MB/s [ 913.9 IOPS]

Random Write 4KB (QD=32) : 1.230 MB/s [ 300.4 IOPS]

Test : 500 MB [G: 37.3% (11.1/29.7 GB)] (x4)

Date : 2013/02/14 12:58:53

OS : Windows 7 Professional SP1 [6.1 Build 7601] (x64)

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

CrystalDiskMark 3.0.2 Shizuku Edition x64 (C) 2007-2013 hiyohiyo

Crystal Dew World : http://crystalmark.info/

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

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

Sequential Read : 20.793 MB/s

Sequential Write : 9.904 MB/s

Random Read 512KB : 20.440 MB/s

Random Write 512KB : 1.682 MB/s

Random Read 4KB (QD=1) : 3.924 MB/s [ 958.1 IOPS]

Random Write 4KB (QD=1) : 1.713 MB/s [ 418.2 IOPS]

Random Read 4KB (QD=32) : 3.756 MB/s [ 917.0 IOPS]

Random Write 4KB (QD=32) : 1.912 MB/s [ 466.9 IOPS]

Test : 500 MB [G: 0.0% (0.0/29.7 GB)] (x1)

Date : 2013/02/14 12:01:03

OS : Windows 7 Professional SP1 [6.1 Build 7601] (x64)

Sandisk 32gb microsdhc

SDSDQUI-032G-A11

I for this and it does seem to be the best available now.
[General Accessories] Neap Tide:
Question regarding random read/write

I am just wondering does random read/write has any worth in case of flash cards? Because mere purpose of these are to store data and not to install OS in them. Sequential read/write can well handle storage solution only. Any knowledgeable person can help me in this regard. Thanks.
[General Accessories] smrht:
I am using a Class 10 from sandisk. Working great and really smooth. Is it correct that the more memory you get the slower it will be?
[General Accessories] Neap Tide:
Sequential write speed is always guaranteed. In case of class 10, minimum write speed shall be 10 MB/s. Random read/write might be sacrificed. But since, mere purpose of flash cards is data storage, random read/write is not considered in this scenario.

I am using Kingston and SanDisk memory cards and I have not observed any sequential read/write speed difference between 16 GB, 32 GB etc of same brand.
[General Accessories] pelago:
Many people store and run apps directly on SD card, at which point random access becomes very important.
[General Accessories] Neap Tide:
I am using kingston microSDHC class 4 16 GB and sandisk microSDHC class 4 16 GB and I have never observed any performance difference in reality among them. In fact, none of the manufacturing company majorly considers random read/write for sd cards. There main focus is always sequential read/write.

In addition, I have always observed SanDisk MicroSDHC cards losing more speed while writing large files (2-4 GB) as compared to Kingston Micro SDHC cards.
[General Accessories] Neap Tide:
Kingston MicroSDHC 32 GB Class 4
[General Accessories] loniczek:
good job
[General Accessories] fixxxer0:
i have a samsung 32gb class 10 and have no complaints.

im not sure if its rebranded though
[General Accessories] The Internet:
I have my original Adata 32GB Class 10 microSD card that I purchased when I got the S3, but then 32GB wasn't enough so I got a Sansidk 64GB Class 10 microSD card. I really should check to see if they truly do perform to class 10 standards, but I've had no problems with either.

Except I once removed 32GB card without properly unmounting it from the S3 and I ended up loosing all that data. I learned my lesson and it never happened again.
[General Accessories] bberrypoptart:
wow, nice! gotta look for one of these
[General Accessories] willmore:
FWIW, NewEgg has the Sandisk 32G uSD ultra SDSDQUI-032G-A11 on sale right now. I'm going to get one.
[General Accessories] nicesoni_ash:
Link please.
[General Accessories] willmore:
Sorry, new member with <10 posts, so I can't give a link. I can give you the product number which is N82E16820171693 and you'll need the code EMCXVVV29. I don't know if that'll work for everyone, but it's worth a try. Brings it down to $27.99 with free shipping--in the USA at least, maybe all of NA.
[General Accessories] rogue5099:
That's for all the testing and getting info out there.
[General Accessories] anhem2012:
Thanks, nice post! :)
[General Accessories] DualJoe:
Transcend TS32GUSDHC10E Class 10 Extreme-Speed microSDHC 32GB - EUR 20,49
[General Accessories] NandroidBR:
I have a 16 gb sd card (PNA), anyone know ?
[General Accessories] stratoll:
Transcend 32GB Class 10

These are my results from my Transcend 32GB Class 10 microsd card
[General Accessories] riahc3:
Didnt even I see I was quoted.

stratoll, please put a model number. Saying the brand, capacity, and class is not enough.
[General Accessories] Julie Bonnet:
Thank you! Very useful!
[General Accessories] drumwizard:
Thanks for all the info, I'm looking to buy one here soon.