yashsingh1/xdaforums huggingface dataset:
[Galaxy S II Accessories] maedox:
What is the point of having good random read/write spead for your external_sd? My opinion; Pointless. Because you save mostly media files on it, and that is highly sequential data. The internal memory and /sdcard (if you save apps to it) will have most of the random read/write, so why not get the fastest card on sequential read/write?
[Galaxy S II Accessories] zkyevolved:
Can I ask you guys a question?

Does this look like a legit card? http://cgi.ebay.es/Sandisk-32GB-Mic...490714?pt=PDA_Accessories&hash=item51999c081a

I want a 32 gig card, and after reading every post I want the Sandisk, now I want a REAL one, not a phony.

What do you guys think? Thanks!
[Galaxy S II Accessories] Venomqld:
just looking at the sellers feed back and how many items has sold for that price looks legit to me, but you never know..
[Galaxy S II Accessories] zkyevolved:
Well, I took the plunge. I'll let you all know ^^ It was fairly cheap, 42 euros shipped :)
[Galaxy S II Accessories] hamkeng:
I got mine from here.

Looks to be the same you found, and appears to be genuine.

I got it within a week. Average write speed is just above 6Mb.

I've always used Sandisk on my phones, and never had any issues.
[Galaxy S II Accessories] Venomqld:
i have allways used Sandisk, cheaper then other brands and good quality, i think..
[Galaxy S II Accessories] amadablam:
Me too! :D

Thanks for sharing and lets hope they are legit. Price is wickedly good.
[Galaxy S II Accessories] deanwray:
If your read the e-bay comments specially the neutral ones, I wouldn't bother!!!
[Galaxy S II Accessories] zkyevolved:
His had 36 neutral of 4,600 votes over one year. I think that's pretty good. That's .008% of the people. That's pretty good :) Regardless, if it comes back as a fake, I'll just open a paypal complaint. Now... How can you tell if it's a fake or not... xD

Regardless, I'll take pictures after I receive it and post it up here and I'll also write Sandisk to see if it looks genuine or not and see what they say :) Of course I'll leave out that it came off of eBay, hehe.
[Galaxy S II Accessories] deanwray:
test the speed and capacity:

Speed, test by PC or Android benchmark program, and compare to others with the same card.

Capacity, copy lots of data onto the card to it's limit, and repeat the speed tests :)
[Galaxy S II Accessories] Pfeffernuss:
That would be 0.8% though... ;-)
[Galaxy S II Accessories] Gilg@mesh:
I also bought that Sandisk 32GB Class 4, let's hope it's REAL and we get good speeds, Class 4 should be enough for 720P recording, right?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=350469490714
[Galaxy S II Accessories] deanwray:
depends on the data rate of the video, but from a default camera app stance, hell yeah!

But I still think that ebay guy sells fakes and would not trust it/them :(

Wouldn't buy memory from ebay at all.
[Galaxy S II Accessories] far2gud:
Bought a 16GB Sandisk class 2 from mymemory for 19 quid, getting 7MB/s Write and 21.8MB/s read speed. The read speed is over twice what the card is rated at so happy days! :)
[Galaxy S II Accessories] Techvir:
Wow that is awesome speeds.

can u do a test using crystal mydisk application and report randam readwrite values please

here is the link to the program.

http://crystalmark.info/download/index-e.html#CrystalDiskMark

Random read write is the key to using in mobile phones.
[Galaxy S II Accessories] far2gud:
The speeds don't seem as good with this test, how will the low random write speeds effect teh usage of the phone?

Cheers

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

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

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

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

Sequential Read : 15.960 MB/s

Sequential Write : 7.351 MB/s

Random Read 512KB : 15.806 MB/s

Random Write 512KB : 0.929 MB/s

Random Read 4KB (QD=1) : 5.007 MB/s [ 1222.4 IOPS]

Random Write 4KB (QD=1) : 0.008 MB/s [ 2.0 IOPS]

Random Read 4KB (QD=32) : 5.149 MB/s [ 1257.0 IOPS]

Random Write 4KB (QD=32) : 0.008 MB/s [ 2.0 IOPS]

Test : 1000 MB [H: 0.0% (0.0/14.8 GB)] (x5)

Date : 2011/06/14 18:32:49

OS : Windows 7 Enterprise Edition [6.1 Build 7600] (x64)
[Galaxy S II Accessories] deanwray:
Subjective, depends on care and usage :)

If you quite often put files on take them of and repeat that lots, depending on the amount of repeats, there may not be enough blocks free to sequentially write the whole file so it will have to write a fragmented file, and thus your speed wont be too good.
[Galaxy S II Accessories] far2gud:
Oh okay, so storing a music collection on it might not be the best idea? would you have a link to an explanation of this? just trying to figure out what I should be using the card for and what I should use the faster internal storage for.

Thanks
[Galaxy S II Accessories] deanwray:
you could store a huge collection on there, and it would read at maximum speed, but imagine you deleted a random 10 files after that, then added 20 back, then deleted 30 and added 40 back etc, some of those files would not be store in addresses that are sequential. But then you can just defragment it :)

Blame MS for making fragmented files systems with address limits so popular
[Galaxy S II Accessories] Nitsson:
Very informative thread, I didn't realise the random read/write speed mattered that much and it's stopped me from buying a Lexar 32Gb class 10 card over the Kingston 16Gb class 4 I have today.

I suppose it's of less consequence for a S2 where you already have a significant amount of on-board memory which the OS can use, and where you just augment with storage primarily used for media (at least in my case).

If anyone is interested, the Kingston 16Gb class 4 performs as per below in CrystalDiskMark. Not the best card around, but I just transferred if from my old phone. Shame that there isn't any 32Gb card that's good overall.

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

CrystalDiskMark 3.0.1 x64 (C) 2007-2010

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

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

Sequential Read : 17.186 MB/s

Sequential Write : 4.606 MB/s

Random Read 512KB : 16.164 MB/s

Random Write 512KB : 0.656 MB/s

Random Read 4KB (QD=1) : 1.657 MB/s [ 404.6 IOPS]

Random Write 4KB (QD=1) : 0.006 MB/s [ 1.4 IOPS]

Random Read 4KB (QD=32) : 1.744 MB/s [ 425.8 IOPS]

Random Write 4KB (QD=32) : 0.006 MB/s [ 1.6 IOPS]

Test : 1000 MB [F: 0.0% (0.0/14.9 GB)] (x5)

Date : 2011/06/16 10:33:03

OS : Windows 7 SP1 (x64)
[Galaxy S II Accessories] bakewelluk:
I'm definitely glad I read through this thread before shelling out for a 32GB card, there's some really useful info here - gotta love XDA-developers :)

I decided to go for the Sandisk in the end based on the recommendations, and for £45 direct from Amazon.co.uk I can't argue about price! Looks like they're going for a good price on the US Amazon site too, for anyone who's interested.
[Galaxy S II Accessories] Sleepycat3:
Nah, storing a music collection is fine. Notice that the random read speeds are still very high. So while it would take longer to transfer those music files onto a fragmented microSD card, it will read back at a good speed and your music won't be interrupted.

Even if it was videos, many are getting random 4K reads of about 5MB/s. That equates to a 40000 kbps video which is way above what you would come across.
[Galaxy S II Accessories] esk02k:
I tested my class 10 A-Data sd in my htc desire and in my galaxy s2. I dont know if this proves anything, wether the phones have faster card readers or if the test is inaccurate but here it is anyway :
[Galaxy S II Accessories] cokeman2:
looks too good to be true .looks all legit thou ,32gb micro sdhc card class 4 for 20 pounds

http://cgi.ebay.co.uk/32GB-Micro-SD...848?pt=LH_DefaultDomain_3&hash=item415ac0dfa8
[Galaxy S II Accessories] deanwray:
Given that it says UK only customers, quite odd, and that low feedback with some quite odd history relationships (inter connected) for feedback, coupled with Kingston AFAIK not have a manufacturing plant in china (nearest being india) add all that to the price, and I would maybe conclude that I wouldn't do business with them. But thats just me, others may be different :)
[Galaxy S II Accessories] dealwithit:
might buy one soon
[Galaxy S II Accessories] deanwray:
Risky since it's hong kong! But if it is legit (I believe it isn't) then let us know cause I'll have 50 or so and make quite a bit of money here in the UK :)
[Galaxy S II Accessories] attig:
I just received my Sandisk 32gb Class 4 from amazon and these are the sequential speeds I get with SD tools via the SGS2:

Write Speed: 5.8 MBs

Read Speed: 12.5 MBs

Isn't this a bit on the low side? Could I have been delivered a lemon or a fake?
[Galaxy S II Accessories] Aero:
Well the class rating is 4, so that's above the normal class rating.
[Galaxy S II Accessories] diehard2222:
exact same card as me. i just got it an hour ago.

write speed - 6.1mbs

read speed - 12.5 mbs
[Galaxy S II Accessories] Venomqld:
I thought mine was low, i have a 16gb Lexar Class 4 with SD tools via the Sony Erricson x10 Mini Pro: (dont have my SGS2 yet)

Write Speed: 7.6

Read Speed: 16.5
[Galaxy S II Accessories] Sleepycat3:
Class 4 means it will read and write sequentially at a minimum of 4 MB/s.
[Galaxy S II Accessories] whiskeybro:
I tested my Patriot Memory 32gb class 10 today PSF32GMCSDHC10 and the price whas 72,80euro incl.

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

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 : 19.282 MB/s

Sequential Write : 10.477 MB/s

Random Read 512KB : 19.071 MB/s

Random Write 512KB : 1.059 MB/s

Random Read 4KB (QD=1) : 7.335 MB/s [ 1790.7 IOPS]

Random Write 4KB (QD=1) : 0.247 MB/s [ 60.2 IOPS]

Random Read 4KB (QD=32) : 7.232 MB/s [ 1765.7 IOPS]

Random Write 4KB (QD=32) : 0.259 MB/s [ 63.2 IOPS]

Test : 100 MB [H: 47.0% (14.0/29.8 GB)] (x3) <All 0xFF, 1Fill>

Date : 2011/06/19 11:02:22

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

-----------------------------------------------------------------------
[Galaxy S II Accessories] alx37:
SanDisk 8GB Class 6 for comparison, 2 years old.

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

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 : 21.241 MB/s

Sequential Write : 17.626 MB/s

Random Read 512KB : 20.846 MB/s

Random Write 512KB : 4.629 MB/s

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 [ 14.2 IOPS]

Test : 100 MB [H: 89.2% (6939.2/7782.5 MB)] (x3)

Date : 2011/06/19 0:47:33

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)
[Galaxy S II Accessories] dragonthl:
Has Anyone tried this?: http://cgi.ebay.co.uk/Memorette-32G...AsAccessories_MemoryCards&hash=item43a7ccadc9

I got Lexar 32GB Class 10 and when I test with SD tools the Write speed only around 6MB/s but when I use it to copy media from laptop to this card its always around 10 MB/s so is SD tools reliable?
[Galaxy S II Accessories] JaeCee:
Just ordered a Lexar 32gb class 10.

I only use my external SD for movies and music - my music libary is fairly static but I often flush out a whole series worth of 720p videos and replace with another huge batch. It's quite an irritating experience trying to transfer a couple gb of videos at a time.

For those highly concerned about random read/write, first, think about exactly what you're using your card for. Do you intend to fill it up with thousands of tiny files that don't even fill up the minimum cluster size ? Then by all means, grab a class 4/6 or even a 2. But if you're using it for general media such as photos, music and videos, then you should realize that all those tests being posted here only show best case (sequential) and worst case (random) scenarios. In real-world use, you'd almost never have a file split by every cluster so those 0.006 MB/s random write results are moot. Normally you'll have large bursts of sustained sequential write followed by a split second of random seek to find the next block of contiguous free space. I'd be surprised if you'd lose even a few seconds of your life from those jumps.

Down the line if ever you do see a noticeable drop in average write speeds, then it's pretty simple to just copy out all the contents onto an HDD, format the card and recopy it all over to cover all the gaps.
[Galaxy S II Accessories] davidoff08:
I have just seen this lexar 32gb for well see for £44.98 , ive used dabs a lot to so great company.... Seems a lot cheaper than Amazon

http://www.dabs.com/products/lexar-...le&utm_medium=product+search&utm_content=Q200
[Galaxy S II Accessories] davidoff08:
How much did u pay for card
[Galaxy S II Accessories] nybreath:
Its probably true that you dont write only in 4kb chunk, but the 4kb random test its the closest thing to real life performance. After few weeks of use you are going to see performances close to the random test matters what kind of files you are going to write.

If you can bother with a full backup, a low level format (the fast format wont help) and put back all your data every few weeks, remembering that you are also lowering the card life in the process, than you can ignore random speed test.

Else you can buy a card with decent random speed and never care about any maintenance.
[Galaxy S II Accessories] Sleepycat3:
On my SGSII, I shoot direct to the microSD card when using the camera. So after a few cycles of reviewing and deleting, then taking videos in between, the files become fragmented. Add the files that I download through my web browser to the card, it does get messed up pretty quickly.
[Galaxy S II Accessories] JaeCee:
$85 AUD off a local eBay seller.

We'll see I suppose. Granted I haven't actually tested my theory, but I'm still skeptical I'm gonna be watching my average transfers go at around 0.008MB/s after a couple of weeks - it's a bit silly that they would even bother to sell these cards at all if the average user experiences those kinds of speeds after a couple of weeks of normal use. Also, I'm not worried about life cycles. People go on about 'limited life' all the time but it's the same deal as TVs. Unless you're actually trying to kill your card on purpose, the card will outlive its actual use. I've got cards I've recycled from 4 years ago that's been heavily used with no sign of them giving up their bits.

AFAIK, there's no such thing as a low level format on a solid state - low level was important for older physical drives for aligning the heads and whatnot. Best you can do with flash is zero-filling the card - which is unnecessary as a quick format wipes the allocation tables. Even if data exists in the sector the OS would just overwrite it sequentially as if the data did not exist.

Like I said I'm fairly specific with my use, but as an experiment, I'll do what what Sleepycat3 does and use it like an average user would. I'll dump everything into it without maintenance. I'll report back once I see significant speed loss from full format.
[Galaxy S II Accessories] Sleepycat3:
It won't hit that worst case speed, but it will also be no where near the 10MB/s mark. I'd say after a month of use, my Lexar Class 10 is only slightly faster than my cheap Sandisk Cruzer thumb drive which does 2.5MB/s maximum sequential write! It is still fast enough to record 1080p video without stuttering though,

It works similarly to SSD's flash memory. You can zero fill the cells which then allows the phone to write straight to the card without having to perform a reset state on the cell. With flash, it needs to zero fill the cell before it sets its 1 or 0 state, so it becomes an additional step the card has to do. This is why SSD has trim/garbage collection steps.
[Galaxy S II Accessories] daddymatt:
I have a patriot class 10 16gb and get scores of 28/32... Pretty crazy!
[Galaxy S II Accessories] Pfeffernuss:
Pix please.
[Galaxy S II Accessories] okupant:
Here are results from my Sandisk 32GB microSDHC. I've not checked yet for real capacity. Just done CDM for speed test :)

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

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

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

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

Sequential Read : 10.684 MB/s

Sequential Write : 5.944 MB/s

Random Read 512KB : 10.496 MB/s

Random Write 512KB : 0.609 MB/s

Random Read 4KB (QD=1) : 2.526 MB/s [ 616.7 IOPS]

Random Write 4KB (QD=1) : 1.637 MB/s [ 399.6 IOPS]

Random Read 4KB (QD=32) : 2.389 MB/s [ 583.4 IOPS]

Random Write 4KB (QD=32) : 0.165 MB/s [ 40.3 IOPS]

Test : 1000 MB [I: 0.0% (0.0/29.7 GB)] (x9)

Date : 2011/06/20 12:40:59

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

PS. Bought couple days ago from amazon.co.uk for £ 44.37 delivered
[Galaxy S II Accessories] xIceCream:
Okay.. I've read the whole thread, and I've got my mind keep changing after 1 post another.

I just want some exact answers and reasons for my question.

What class and brand you guys recommend ? For which, I used to stored alot of games ( including downloadable date ) and apps, listening to songs. Seldom use for recording, but who knows i might use it in the future.

Please leave a reply. Thanks.
[Galaxy S II Accessories] tosin01:
Ive just got one of the sandisk 16Gb ones from amazon uk. under £15. fingers crossed it works fine with my sgs2
[Galaxy S II Accessories] Techvir:
I have heard good reviews in terms of speed for this card. However the failure rate seems to be pretty high. I was tempted to buy it but went back after reading the reviews . See the link > But the manufacturer seems to be pretty consumer friendly

Read the feedbacks at neweeg

http://www.newegg.com/Product/Produ...547&cm_re=32gb_microsd-_-20-220-547-_-Product
[Galaxy S II Accessories] okupant:
So I've checked my Sandisk 32GB and loaded it full i.e. 29.7GB.

Looks like is genuine :D.

Once again: bought from amazon.co.uk; seller Jarlink; in stock now; current price £42.93 delivered.
[Galaxy S II Accessories] theone_s_me:
Kingston is the best, i have one with class 10, works perfect
[Galaxy S II Accessories] deanwray:
Not sure you would qualify in saying it's the best, lol, maybe you should say out of all the cards I've used ,A,B,C,D,Kingston .... Kingston is best for me ;)
[Galaxy S II Accessories] dragonthl:
I think he means: I've used only Kingston, it's the best.
[Galaxy S II Accessories] nybreath:
I wouldn't buy a Kingston cause the price are really high, but Kingston are the best memory brand I have ever used, I haven't tried the 32gb class 10 (around 100euro ouch!), but I got rams and smaller microsd cards and they are the best I own.

Fast, realiable, and durable. The problem is that you pay for that.

I can find a lexar class 10 for 60euro and a kingston class 10 for 100euro.

Actually I'm thinking to buy a mustang or a lexar anyone has used any of these with success?.
[Galaxy S II Accessories] Gilg@mesh:
I got this card today and happy with the speeds, its a Class 4 but I get Class 6
[Galaxy S II Accessories] Techvir:
Can u test with crystalmark memory card tester and post the random readwrite values please
[Galaxy S II Accessories] Gilg@mesh:
I'll do it tomorrow as Im busy playing F3AR. :-)
[Galaxy S II Accessories] Panosz:
Hii all planing on buying a 32gb Micro sd

Any one got any good tip on what company

Thx
[Galaxy S II Accessories] kristiandk:
Would also like some buying tips!
[Galaxy S II Accessories] stemarlen:
Aussie stock

I've noticed a few fellow Aussies have been asking where to buy these cards.

I managed to find a few online stores that provide these cards at quite reasonable prices and may include free shipping.

They are also genuine items, not eBay PARC <- read it backwards

Here are the links... hope it helps

GetPrice

crazysales 1

crazysales 2

Cheap Chips

Cheers

Stem
[Galaxy S II Accessories] R3Y:
Can someone please tell me which of these two cards are better?

32GB MicroSD Class 4 - http://www.flipkart.com/mobiles/memory-cards/itmczcrqrz9st4xe?pid=acccz4ffpnd5h8mg

OR

32GB MicroSDHC Class 2 - http://www.flipkart.com/mobiles/memory-cards/itmczcrq3zgvypbt?pid=accctpgvcuaewnat

I am in a bit of confusion, which is better MicroSD Class 4 or MicroSDHC Class 2? :(

Thanks.
[Galaxy S II Accessories] SirGadden:
This is what I got from my Kingston 16GB Class 2 card :)

Really happy with the results so looking for a new Kingston 32GB Class 6+ card now...
[Galaxy S II Accessories] Panosz:
Have a queston class 10 is it good or what is the best cladd

Thx
[Galaxy S II Accessories] Techvir:
Class4 is better and probably best for mobile use.

However i cant say if the site is selling genuine cards. Class4 is cheaper than class2 ???????
[Galaxy S II Accessories] vodanhdaisu:
I'm using a Lexar 32G Class10, I bought it from amazone.co.uk, 65 pounds, I tested it with SD Tool with the result 11.5/22, and the tool also recognized the card brand is Lexar although it didn't recognize which class of the card :)
[Galaxy S II Accessories] dragonthl:
Rly i got one from amazone uk too but when i test it with sd tool just around 7mb/s write, rly disappoint.

Bac vodanh dang o dau the?
[Galaxy S II Accessories] vcys86:
I had read through all the pages from page 1.

Seems like the best for bucks card for 32GB would be SanDisk Class 4?
[Galaxy S II Accessories] R3Y:
The site is genuine, that I can guarantee.

The Class 4 one is MicroSD hence cheaper, while Class 2 one is MicroSDHC. I have read SDHC are better and costlier.

But I am confused between the class thingy. Should I get SD or SDHC? Does class matter between them? :o

Thanks.
[Galaxy S II Accessories] mdalacu:
Don't get the Lexar, i just did and it's slow and expensive (7MB/12MB @65 pounds). If i copy movies through an usb card reader never tops 6MB. My Adata 16GB class 6 did 9/20MB. I am really feel dissapointed by Lexar.
[Galaxy S II Accessories] deanwray:
my lexar from play.com is 11.8 22 or 24 cant remember, you sure yours is legit?
[Galaxy S II Accessories] Joey2o11:
Where did you read this rubbish??? HC simply stands for High Capacity. The Class 4 card would be the quicker of the two.
[Galaxy S II Accessories] Sleepycat3:
No. Any SD or microSD card greater than 2 GB in size is a SDHC card.
[Galaxy S II Accessories] R3Y:
See here - http://www.flipkart.com/mobiles/memory-cards/itmczcrqrz9st4xe?pid=acccz4ffpnd5h8mg

That's a microSD card but with 32GB? :confused: I also thought microSD's are upto 2GB only.. :\
[Galaxy S II Accessories] mdalacu:
@deanwray: I bought it from Amazon uk, format it with 32KB cluster size and now I use it in my galaxy tab because is not a match for sgs2 :(

I am waiting for adata 32GB class 10 to became available.
[Galaxy S II Accessories] Techvir:
Which card r u talking abt ?

I cant recall a microsd card that should not be compatible with sgs2
[Galaxy S II Accessories] nybreath:
You dont get class 6 performance cause you are not doing the test in a fragmented state but in a sequential state.

As definition CLASS = The Class number represents a multiple of 8 Mbits/s, and meets the least sustained write speeds for a card in a fragmented state.

You only did a sequential transfer test, but has nothing to do with the class speed.
[Galaxy S II Accessories] R3Y:
I can't get hold of any MicroSDHC 32GB Class 4 or greater. Should I go with Class 2? Are they fine?
[Galaxy S II Accessories] mdalacu:
I didn't say that is not compatible with the phone, I have sad that the card does not compare in terms of speed with it, the phone is fast so it deserves a better card. I was talking about Lexar 32GB class 10 micro sdhc card.