yashsingh1/xdaforums huggingface dataset:
[General Accessories] vernon092487:
Glad I read this guide, I'm currently looking into buying 32GB card for my Sensation XE.

Nice work!
[General Accessories] xmvr:
I'd be very cynical about anything eBay having been obtained from an official reseller, and thus doubtful about its origin. Cards are too easy to fake, so I'd stick to trusted retailers only.

---------- Post added at 04:50 PM ---------- Previous post was at 04:26 PM ----------

I'd be very cynical about anything on eBay having been obtained from an official reseller, and thus doubtful about its origin. Cards are too easy to fake, so I'd stick to trusted retailers only.
[General Accessories] MisterMonitor:
It's very pricey to buy from shop in my country. Amazon dont ship sd cards to my country, all i got left is ebay. That seller sold not much, but has a positive feedbacks about his products, maybe i should try or maybe someone can recommend me a seller?
[General Accessories] sgtfoo:
If anyone sees them, various online shops are selling "RetailPlus" brand micro sd cards. I got a 32gb one back in december 2011 and it's gone corrupt.

AVOID them.
[General Accessories] CamoGeko:
Looks genuine to me.

I actually bought a similar one in June last year to accompany my SGS2 and it has worked fine ever since. Mine was actually slightly more expensive as well.

Communicated using an S2 type Droid while floating in CM9 Galaxy
[General Accessories] runeazn:
I assume your from the UK?

www.amazon.co.uk

and if your from a different country i cant help you, you always can check if your local electronic store for sales,
[General Accessories] ogram:
and I was just going to run to Wal Mart and grab a cheap one, thinking they were all relatively the same. So glad I didnt waste my money. Not to mention years of frustration playing the waiting game.

THANK YOU!!
[General Accessories] MisterMonitor:
No, im not in UK :) .
[General Accessories] MisterMonitor:
What do you think about this one? I think i should buy this one.

http://www.ebay.com/itm/San-disk-32...biles_PDAs_Cartes_mémoire&hash=item56483ad66e
[General Accessories] dazza9075:
Unless your using it for large files stick to the class 4, especially for WP, the SanDisk ultra mobile class 4 is pretty good
[General Accessories] xmvr:
Reading back through the thread, I found the Tom's Hardware micro sd review (tomshardware.com/reviews/microsdhc-memory-card-performance,3011-12.html#comments). It was interesting to see the almost polar opposites of performance between the standard Sandisk Class 4 and the Sandisk Ultra Mobile. The Ultra won a number of tests, but performed only averagely (and much slower than the class 4) in the 4k test. However, the Class 4 came last or thereabouts in the other tests.

For me, the card is going to have 4 uses:

transfer music, video & podcasts from PC to card

playback of music & video on phone

recording photo & video from the phone's camera

running apps from the card

It's clear that 3 of the 4 would benefit more from sequential perfomance. I run a few apps from the card, but not too many, and the only one that is critical, performance wise, is Skype. Ideally I'd like to try both cards together, but that's not practical! So I'm going to buy the Sandisk Ultra Mobile Class 6, and see how it goes. If it doesn't work out, I can always ebay it and buy the Class 4 instead :). I'll post some benchmark results once it arrives.
[General Accessories] Vickness:
New 32gb sandisk sdhc microsd class4, keeps throwing a "delayed write failed" message on my xp pc. Formatted with fat32 via external card reader bcuz sandisk adapter only showed 512 instead of 32. It proved difficult to find any info on this problem. F.Y.I. few files will keep to the card, but for most part theyre just empty parent folders. Need to transfer files frm my tiny 8gb card (out of rooted evo4g). Any tips would b killer cuz im very tired of searching and trying unsuccessful nonsense lol. Thnku much u guys r always the best
[General Accessories] zgonacy:
Very very thanks. Super topic.
[General Accessories] MisterMonitor:
Ultra mobile ar only class 6 .

"Get more speed (up to 30 MB/sec* and enabled Class 6) for faster photo, Full HD† video and app performance on your mobile phone or tablet with SanDisk Mobile UltraTM microSDHCTM memory cards"

source: http://www.sandisk.com/products/mobile1-memory-products/ultra-microsdhc-memory-card

---------- Post added at 09:47 PM ---------- Previous post was at 09:05 PM ----------

Is this sd card not fake ?
[General Accessories] dazza9075:
The red gray ones are class 6 the black ones are class 4, I have one, works perfect for WP, but it's impossible to say the same for everyone, I researched that thing for over week until I was happy that the chances of it working were high enough
[General Accessories] MisterMonitor:
but class4 has better random speed, so phone will be faster with class4 right?
[General Accessories] cajunflavoredbob:
Please read the last couple of pages. We've discussed this so many time already.
[General Accessories] MisterMonitor:
Yes, i now, but card is ultra mobile class6 , class4 is not ultra mobile. So i thought maybe ultra mobile has bigger random speed than regular class6 card, because its called ultra mobile, so maybe specialy adapted for mobiles and has bigger random speed than class4.
[General Accessories] cajunflavoredbob:
Oh, thought you were asking about regular class 4 speeds. Carry on. :)
[General Accessories] GladiatoRiley:
Best all round MicroSD?

Hi, I am looking for the best 32gb card for my Sensation. What can you recommend? I was looking at this , but now after reading i am having doubts on Class 10 cards...

I dont transfer too many photos/ videos, so that isnt a deal breaker.

I just want a card that is reliable and generally fast for apps, music and flashing ROMs and such...

Thanks in advance,

GladiatoRiley
[General Accessories] cajunflavoredbob:
How many times do we have to say this?

Low class = fast app loads

High class = fast file transfer

Class 4 and Class 10 seem to be the best in either category. Class 6 sucks all around.
[General Accessories] GladiatoRiley:
Thanks, but what about the SanDisk Mobile Ultras?
[General Accessories] cajunflavoredbob:
Same principle. I don't think we've seen many benchmarked, though. You won't see any improvement in speed unless you're transferring large amounts of data, or using it for a stand alone camera. Just because the card's speed ratings say it is faster, doesn't mean your phone will read or write to the card faster. The cards allow faster speeds than what your phone is capable of keeping up with.

It's a waste of money, in my opinion. Regular SDHC is plenty for most users.
[General Accessories] Lukasloik:
Hi

I found a pdf document about this theme...but I can't post a links (like a new member).

Try google: static usenix microsd (the name of research is

"Revisiting Storage for Smartphones - USENIX")

I am not sure the quality of research...but there are some interesting informations.
[General Accessories] Damasterjj:
Thanks I already have a 32gb class 4, good thing I saw this thread I almost bought higher class cards
[General Accessories] kangodeng:
Good post. Can I use a 32 gb microsd card in my sensation?
[General Accessories] Saturn007:
I can't wait to get home to test my new Sandisk 32GB

Mine does have the class 4 on it. Does that mean it's an old stock?
[General Accessories] cajunflavoredbob:
Glad we could help. :)

Yes.

Please read the thread. Classes have nothing to do with dates. It's a speed rating.
[General Accessories] Technosquid:
I'm trying to decide which 32GB SanDisk Class 4 card is better.

SDSDQ-032G-A11M (bought and tested December 2010)

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

CrystalDiskMark 3.0 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World :[...]

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

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

Sequential Read : 7.678 MB/s

Sequential Write : 5.014 MB/s

Random Read 512KB : 7.470 MB/s

Random Write 512KB : 4.703 MB/s

Random Read 4KB (QD=1) : 0.969 MB/s [ 236.6 IOPS]

Random Write 4KB (QD=1) : 2.003 MB/s [ 489.0 IOPS]

Random Read 4KB (QD=32) : 0.574 MB/s [ 140.1 IOPS]

Random Write 4KB (QD=32) : 1.746 MB/s [ 426.3 IOPS]

Test : 100 MB [E: 0.0% (0.0/29.7 GB)] (x5)

Date : 2010/12/23 13:48:47

OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x64)

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

or

SDSDQM-032G-B35N (bought and tested November 2011)

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

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 : 20.015 MB/s

Sequential Write : 4.396 MB/s

Random Read 512KB : 19.352 MB/s

Random Write 512KB : 0.732 MB/s

Random Read 4KB (QD=1) : 2.587 MB/s [ 631.7 IOPS]

Random Write 4KB (QD=1) : 1.185 MB/s [ 289.2 IOPS]

Random Read 4KB (QD=32) : 2.542 MB/s [ 620.6 IOPS]

Random Write 4KB (QD=32) : 0.720 MB/s [ 175.9 IOPS]

Test : 100 MB [H: 0.0% (0.0/29.7 GB)] (x5)

Date : 2011/11/14 18:10:32

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

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

I noticed both are still available on Newegg. I see that the SDSDQM-032G-B35N has much slower 512KB random write, but I'm not sure if that's relevant to my usage case. I want to use it as a Windows Phone memory card.
[General Accessories] cajunflavoredbob:
Windows Phone 7 needs high random speeds. Use a Class 2 card for WP7. Shouldn't matter which one between the two your listed. Higher random speeds equal better performance with WP7.
[General Accessories] Technosquid:
B35N has ~ 2.5x the 512k random read as the A11M.

A11M has ~ 6.5x the 512k random write as the B35N.

B35N has ~ 2.5x the 4k QD=1 random read as the A11M.

A11M has ~ 2x the 4k QD=1 random write as the B35N.

Given that the difference in these specs is in multiples, was just hoping that someone had an opinion on which random benchmark had the most relevance.

I know back when windows was pushing ReadyBoost as a feature to improve cached memory access for systems with 1GB or less or physical system RAM, they were recommending specifically flash drives with at higher 512k random write and 4k random read.

Any insight on how the Windows Phone device behavior might be the same or different in a way to inform my memory card selection?
[General Accessories] cajunflavoredbob:
Read times are more important on WP7 devices. The B35N is a better card for you in this case.
[General Accessories] Saturn007:
I was referring to this:

Which made think mine is maybe old stock since it displays the class rating on it.

It's an observation. I know what they mean.
[General Accessories] cajunflavoredbob:
I misunderstood. Sorry about that. I don't use Sammy's cards, so i'm not really sure. If there new policy says that they don't print the classes, then I guess that makes the ones with the class numbers printed older cards.

Personally, I'd prefer to have the number printed on there. It makes me feel better about not getting scammed. The SD market is FULL of scammers selling knock off crap for bargain bin prices.
[General Accessories] alanapone:
Found a 32gig sandisk class 4 for 22 quid delivered last night!! BOUGHT!! I'll post link later.
[General Accessories] drigz08:
Can you guys tell me which is better of the two?

32GB Sandisk Class 4

32GB RiData Class 10
[General Accessories] cajunflavoredbob:
Those tests aren't accurate since you didn't do them from a fresh format for both. There should be nothing at all on the cards when you do the test. Make sure you have the same test file size selected next time as well.
[General Accessories] connor-:
Ewwww comic sans xD But not really fair test since one has data on it. :-)
[General Accessories] drigz08:
If the Ri-Data will get reformatted and tested which would you think will perform better?
[General Accessories] cajunflavoredbob:
Test it and let's find out. :)
[General Accessories] onetonnoodle:
cajun, is the sequential speed of 32gb sandisk class 4 microSD cards sufficient to play 1080p movies from it?
[General Accessories] cajunflavoredbob:
Yep .
[General Accessories] onetonnoodle:
well that finally settles my decision to go for sandisk 32gb class 4 instead of class 10, thanks!
[General Accessories] cajunflavoredbob:
No problem. Higher classes are better for recording the high res video.
[General Accessories] drigz08:
@cajun I dont have time to reformat my ridata anytime this month, can you give me a wild guess if ridata gets reformat, which will be performing better? Ridata vs sandisk based prom pics above.
[General Accessories] cajunflavoredbob:
Just copy the data off your card, format, test, then copy back. It only takes about 30 minutes. The pics above are useless since they weren't done exactly the same. It's like comparing apples to bowling balls.
[General Accessories] onetonnoodle:
are the red-gray colored sandisk mircoSD cards any good?
[General Accessories] cajunflavoredbob:
That question could not possibly be any more vague.
[General Accessories] onetonnoodle:
haha sorry. It says class 6 on the box, but I was just wondering if anyone has done some benchmark on this seemingly new variant of sandisk microSD cards. The ones I usually see are colored black, hence my thoughts if these new batch of microSD cards have improved in a sense that even though they do have higher sequential speeds, their random speed doesn't lag too much behind. :)
[General Accessories] cajunflavoredbob:
Maybe posting a model number instead of telling us what the paint job looks like would help us out a bit. :rolleyes:

It's not too hard to perform a quick speed test on it. Compare that result to the rest of them in the thread.
[General Accessories] dazza9075:
I think his talking about the ultra mobile series, from my tests the class 6 versions ( red grey) on WP7 did not perform well, the black ultra mobile is a class 4 an is a beast!. that's just my view and some serious research it doesn't mean it won't work for you an should be fine on any other OS
[General Accessories] cajunflavoredbob:
Class 6 sucks on WP7 because the random speeds are poor. Class 2 or 4 should be used with WP7. Class 6 is generally bad in both sequential and random. WP7 needs high random speeds, not sequential.
[General Accessories] dazza9075:
correct, statistically speaking, and from my own experience but not always the case. Spent ages researching cards and the class 4 of the ultra mobile series is very likely to work, the black one. =)
[General Accessories] drigz08:
How about android phones. Do they rely more on random than sequential?
[General Accessories] cajunflavoredbob:
WP7 bonds the SD cards with the NAND memory in a sort of RAID 0 array. Because the memory acts as one single unit, rather than separate storage and internal memory environments, it needs a memory format with high random speeds to be able to run apps, cache data, and do other things that the internal NAND memory on other devices would normally handle.

Android devices use the SD card as a memory card. You need to decide which class to get based on what you mainly use the card for. Running apps and games from the card would be better with a lower class card. Recording HD video, transferring files, and saving pictures will be faster with higher class cards.
[General Accessories] patriot720:
I have a question. I like to use emulators a lot, I store the emulators on my internal memory, and but I store the roms for them on my micro sd card. Would they be faster with a low class or a high class?
[General Accessories] cajunflavoredbob:
Store both on a low class SD. Separating them between internal and SD memory is more likely to cause a lag. Emulators are just not the most memory efficient applications. The ROM images are not read sequentially. Information about certain dungeons or bosses are stored in different parts of the ROMs, therefore, random access is more important.

As I've stated oh so many times, app usage is random, video recording/file transfers are sequential.
[General Accessories] drigz08:
Hmmm real world testing,

Why is it when I played asphalt 6 on mg Galaxy S II

Class 4 sandisk 32 gb - laggy

Class 10 Ridata 32 gb - not laggy compared to sandisk

Same content this time, they only have asphalt 6 data.

Both brand new
[General Accessories] cajunflavoredbob:
It may have to do with different brand cards or the way the app runs. My statement on class ratings is very general. Perhaps the app optimizes the data locations in a more linear style than normal.

In a racing game, the data and progression are more linear, so the data may be stored similarly. Normally in a game file, you might have all the character information stored somewhere, then all the item information, then all the world levels, all the sprites that could appear. in a racing game, there isn't much to guess at in terms of loading. The game already knows which cars will be on the track, which track will have which features and so forth.

Hopefully that explains it better.
[General Accessories] drigz08:
@cajun -

Thank you for explaining your point of view, you have been very active and helpful.

Now we have a grasp on the difference and importance of random and sequential read/write on android and wp7 phones.
[General Accessories] cajunflavoredbob:
Always glad to help you guys.
[General Accessories] onetonnoodle:
I wasn't able to look at the model numbers since i just quickly browsed through a local electronics shop. The color was the only thing that registered to me since all the others are black. haha xD Anyway I think dazza is right that they're the utlra mobile versions.
[General Accessories] cajunflavoredbob:
Probably so, but it's hard for us to do much with your mental pictures. :)
[General Accessories] onetonnoodle:
well yeah, fair enough from your point of view. But good thing for me there are others who can share info even from mental pictures alone. :)

Anyway, i'll try posting data after my purchase. Thanks everyone :)
[General Accessories] pacogp:
Thank you for the info.

We need now a good file system for files bigger than 4gb
[General Accessories] KiTTy_xL:
warning please the sd class
[General Accessories] masteriori:
I have heard on various forums that SanDisk 32GB microSDHC is pretty good for mobile devices, however, have no personal experience. Anyone can debunk or confirm?
[General Accessories] cajunflavoredbob:
Format the card as NTFS if you need to store bigger files. Otherwise, you can use WinRar or 7Zip to split an archive into smaller segments.

Note that most phones need the SD card formatted as FAT32 in order to read them.

---------- Post added at 02:35 PM ---------- Previous post was at 02:26 PM ----------

Please read back a bit through this thread for you answer. Also, we can't give much advice on a card if you don't provide a model number, class rating, or benchmark.
[General Accessories] drjamit:
San Disk biased ??

I have read all the 38 pages in 2 days as i was going to buy a 32 gb card. All the information is quite informative but seems to be biased for sandisk 32 gb class 4. Is it such a great card. I ordered Transcend Class 4 and sandisk class 4 simultaneously to see real time scenario for my SGS2 with 116 apps installed , Lot of HD videos and tons of images and music. Will post results soon. BTW why no one talk of Transcend. Is it a bad brand.

Price Transcend 32gb class 4 = 1700 Rs ( INR )

Sandisk 32 gb Class 4 2000 Rs. ( INR )
[General Accessories] cajunflavoredbob:
Probably because not many people actually have Transcend cards. We can only give results on cards we use. Personally I only use SanDisk. Samsung cards are also popular. No one is against other cards, we just have our own preferences. We'd be more than happy to see your results with the Transcend.
[General Accessories] onetonnoodle:
cajun, is there a right of way of doing the speed tests? I mean i can't decide which setup will provide a more relative result. It's between testing it while using an SD adapter connected to the PC, or with the microSD mounted on the smartphone then connected via microUSB to PC.
[General Accessories] itsmyname:
A SanDisk 16gb Class 4.... Any good?
[General Accessories] onetonnoodle:
it depends on what you are going to use it for :)

as stated before, lower class cards are generally good for smartphones with lots of app interaction, or usages that needs faster random speeds.

Higher class cards are generally good for transferring huge files, for HD video/media capturing, or usages that needs faster sequential speeds.

hth :)
[General Accessories] drjamit:
Here is the capture

Transcend 32 gb Class 4 capture. Still awaiting sandisk 32g. How is it ??
[General Accessories] xasd:
:oI am now using SANDISK 64G

Write < 7M
[General Accessories] itsmyname:
Well I'm going to put it into my Arc S. All my music will be on there, as well as movies and a few files maybe.

Is it good enough for that?
[General Accessories] xasd:
Agree with, generally good for smartphones must use high speed card.
[General Accessories] cajunflavoredbob:
SD adapter on the PC.
[General Accessories] vicedens2002:
Got some results from my 2 memory cards and HDD :D (for comparison)

1.

Samsung 8GB class 6 bought at play.com for 12.99 pounds Q42010

Desire HD FAT32

2.

Sandisk 1GB No class came with Samsung I5500 Europa Q32011

FAT

3.

Windows drive 60GB Class 3072 5400RPM q32009

The cards were tested through USB cable (Card inside phone)

Windows 7 PRO 64-BIT SP1
[General Accessories] fyyzer:
Patriot 32gb Class 10 - Not been a good card for me

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

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 : 19.856 MB/s

Sequential Write : 17.332 MB/s

Random Read 512KB : 18.983 MB/s

Random Write 512KB : 0.724 MB/s

Random Read 4KB (QD=1) : 3.780 MB/s [ 922.9 IOPS]

Random Write 4KB (QD=1) : 0.006 MB/s [ 1.5 IOPS]

Random Read 4KB (QD=32) : 3.896 MB/s [ 951.2 IOPS]

Random Write 4KB (QD=32) : 0.006 MB/s [ 1.4 IOPS]

Test : 1000 MB [G: 5.8% (1.8/30.9 GB)] (x9)

Date : 2011/07/16 7:49:13

OS : Windows 7 SP1 [6.1 Build 7601] (x64)
[General Accessories] Techvir:
thanks for the report. added to first post.

Your bad experience could be related to the poor random speeds.

I am surprised to see that becoz there is another report of patriot card class 10 with better random speeds . See first post

Are u sure the card is genuine ?
[General Accessories] Techvir:
this is from SGS2 thread
[General Accessories] cajunflavoredbob:
It seems the SanDisk Class 4's are the way to go. I've had mine for a few months now. The results are below. I did one test with data on the card and one after doing a full format (not Quick Format for all you Windows users). The results were similar, but, as expected, it did not make much of a noticeable difference.
[General Accessories] Warlord_Link:
Thank you for information.

My friend advise me to buy 32Gb class 10 from Lexar. After I see this topic I think I will go with Sandisk.
[General Accessories] cajunflavoredbob:
The thread isn't meant to persuade you from one brand or another. It's basically letting you know that class ratings are more or less meaningless whe it comes to smartphones where you have applications and other frequently accessed data stored. Sequential read/write speed is only really meaningful when it comes to music and video playback and things like that. Either way, Lexor or SanDisk probably won't have a meaningful difference between the two of them.
[General Accessories] PrinceVegeta978:
Great info, i have been wanting to grab one of these for about a week now but was unsure what to buy.
[General Accessories] iamloco724:
thanks for the info..so what would everyone reccomend im looking for a 16gb micro sd for my new droid 3 that will be fast and reliable and would be good for full 1080p video
[General Accessories] disiples:
my sandisk is perfect, no issues for me