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MicroSD Cards

Which is better a 16gb Class 2 or a 8gb Class 6 just in general do I sacrifice speed for storage of vice versa..

rawrwill said:
Which is better a 16gb Class 2 or a 8gb Class 6 just in general do I sacrifice speed for storage of vice versa..
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I was in the same boat , after reading through various threads , I
now have a class 2 16gb card on the way

I've got a 8gb cauz i aint store that much video's and mp3 on my phone that i need 16gb

If you use app2sd, or plan to use it, class 6 is a better choice.

boge said:
If you use app2sd, or plan to use it, class 6 is a better choice.
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Not necessarily! My 16gb Sandisk class 2 card outperforms class 6 minimums.
Regards,
Dave

foxmeister said:
Not necessarily! My 16gb Sandisk class 2 card outperforms class 6 minimums.
Regards,
Dave
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If it does, then why isn't it a class 6?

what is a good program to benchmark SD card speeds in our phones?

harolds said:
If it does, then why isn't it a class 6?
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The classes they are given are the minimum they must be able to do.
If a card maker makes 10 batches of cards and they all turn out to be capable of class 6 speeds however they only have orders for 5 batches of class 6 and 5 batches of class 2, what do you think they'll do? Label half as class 6 and half as class 2.

harolds said:
If it does, then why isn't it a class 6?
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Click to collapse
As has been said - the class of the SD card just guarantees you a minimum speed - in fact, a minimum sequential write speed.
I get the following:
16gb Sandisk Class 2
Sequential Read : 20.050 MB/s
Sequential Write : 7.415 MB/s
8gb Transcend Class 6
Sequential Read : 19.938 MB/s
Sequential Write : 15.020 MB/s
(Tested using CrystalDiskMark 3.0 with both cards in an adaptor directly connected to the PC via USB)
Both cards well exceed the minimum 6MB/s for Class 6, with the Class 6 card coming out as twice as fast as the Class 2.
If you're using a high-res digital camera, you will notice that write speed difference as it will decrease the amount of time it takes to save a picture and thus how quickly you can take the next. However, in general use on a phone you just will not notice this, making the Sandisk Class 2 card a much better buy.
Regards,
Dave

Class 2 a little fast?

So I have a class 2 8gb sd card (sandisk) that I bought about a year ago. A similar one came with my G2 recently and I decided to test the speeds to use the faster one. The one I purchased a year ago, it turns out, reads at 10 MB/s and writes at 5.5 MB/s. I confirmed it with several trials. I thought that SD classes indicated speed... and that a class 2 = 2mb/s r/w, class 4 = 4, etc. This seems very fast, especially considering the other class 2 8gb that came with the g2 runs at about half the speed.
How come they vary so much? Is this card that I have faster than a class 6?

You are right when you say a class 2 should have 2 mb/s and a class 4 should have 4mb/s, but there is something you are forgetting: the class is the minimum write speed. I have a samsung class 6, which has a minimum 6 mb/s write speed, but it actually writes at 9.5 mb/s and reads at 17 mb/s. A card is considered to be a class 2 if during testing it can consistently score 2 mb/s.

Sandisk cards are/were known for being faster than their ratings.

I just bought a sandisk 16gb class 2 on amazon. I ran a speedtest and was consistently getting class 4 speeds and and made it up to class 6. I'm glad I didn't pay extra for that class 4.
Sent from my T-Mobile G2 using Tapatalk

I've ever had a bad experience with SanDisk MicroSD cards.
SanDisk MicroSD Cards (Class2):
Owned: 10 (Various sizes, 256MB - 2x512MB - 6x1GB - 1x8GB)
Broken: 10 (After less than a year, on Motorola V3x, Nokia E66 and HTC HD2)
- Speed: Avg. 6MB/s (HTC HD2) - Avg. 1MB/s (Nokia E66) - Avg. 4MB/s (Moto V3x)
OEM/unknown MicroSD Cards (Class2):
Owned: 3 (2x1GB - 4GB)
Broken: 0 (bought more than a year ago)
- Speed: Avg. 6MB/s (HTC HD2) - Avg. 1MB/s (Nokia E66) - Avg. 5MB/s (Moto V3x)
Kingston MicroSD Cards (Class4):
Owned: 2 (2GB - 4GB)
Broken: 0
- Speed: Avg. 12MB/s (HTC HD2) - Avg. 5-6MB/s (Moto V3x)
A-Data MicroSD Cards (Class6 -- 8GB):
Owned: 2
Broken: 0
- Speed: Avg. 15MB/s (HTC HD2) - Avg. 18MB/s (Moto Milestone)
So I don't think that Sandisk MicroSDs are so much good.
Anyway, I'm planning to buy a 16GB MicroSD card for my Desire Z.. and surely it'll be an AData Class6 card...

[Q] microSD cards: what sizntee /class for inded Data2SD/App2SD use?

Hey, I know that there's been some threads around but from searching through them it seems most haven't been commented on since last year, so I was hoping to see if there might be some change in opinions etc since then.
I'm in the process of buying a HTC Desire, and while I love the flexibility of Android, I can see myself getting annoyingly held back by low internal memory.
So my intended solution was to eventually root my phone when I have a spare moment, and flash the StarBurst ROM, since Data2SD seems to do a better job at forcing apps to install onto an SD card compared to App2SD (correct me if I'm wrong - newbie here) -- I know that I'd still have to install some widgets etc onto internal memory.
SO: my question is: What size of card would be good? And will I need to consider a Class 4 to be able to make use of Data2SD / App2SD functions?
There's an approximate $4-5 difference between a class 4 4GB + 8GB microSD card on eBay (and obviously, a class 2 of these two will be cheaper)
- I'm happy to pay for the larger card, provided that the extra 4GB are likely to be put to use (ie, I'm not entirely sure how much of a card I should reserve for apps to have room for a decent collection in the future)

Hi!
I am using a 16GB class 4 from SanDisk. I have 15GB fat32 and a 1GB ext partition with Oxygen 2.0 and Data2SD. Absolutely no lags at all, just fine. Class 4 is good enough. You won't set the best result in benchmarks, but I personally don't care about benchmarks. As long as everything is going smooth i'm happy.
Size is a choice you have to make yourself. 1GB for apps is enough for me. Music and stuff on the fat32 partition. It depends on what you want.
I hope this helps.

1 gb for ext partition (data2sd) is more than enough and rest for fat32 (sd card) so size is really up to you but 4 gb wasn't enough for me. You should be more concerned with the card speed. Maybe instead, of ebay pay little a bit more and get the genuine fast card. I'm happy owner of a-data 16 gb class 10 working smoothly on StarBurst. Be careful of chinese fakes on ebay.
Swyped via StarBurst Desire.

kl_arnet said:
1 gb for ext partition (data2sd) is more than enough and rest for fat32 (sd card) so size is really up to you but 4 gb wasn't enough for me. You should be more concerned with the card speed. Maybe instead, of ebay pay little a bit more and get the genuine fast card. I'm happy owner of a-data 16 gb class 10 working smoothly on StarBurst. Be careful of chinese fakes on ebay.
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Yeah, I heard about eBay fakes along the way. This is the type of card I found through ebay SanDisk 4GB Class 4 (can't link directly due to being a newbie on here, unfortunately), it says its coming from US from a "dz-tech" seller.
- So if I need to stay away from eBay, should a google search along the lines of "8GB class 6 microSD" suffice for finding a reputable dealer?
bart-n said:
Hi!
Absolutely no lags at all, just fine. Class 4 is good enough. You won't set the best result in benchmarks, but I personally don't care about benchmarks. As long as everything is going smooth i'm happy.
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Thanks for that what exactly do you mean by setting best results in benchmarks? I mean, I don't mind if the card doesn't score the highest in speed ratings, but I'm assuming that you're referring more to the fact that a class 4 is fast enough to let me run apps from the card through the phone smoothly?

salxtai said:
.....
Thanks for that what exactly do you mean by setting best results in benchmarks? I mean, I don't mind if the card doesn't score the highest in speed ratings, but I'm assuming that you're referring more to the fact that a class 4 is fast enough to let me run apps from the card through the phone smoothly?
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I mean that if you run a benchmark, you will probably get better results with cards that are rated with a higher class. So with a class 6 (or 8 or 10) you will get a better benchmark result. But, my point is, a class 4 card is good enough to use for data2sd and that stuff (as used in starburst rom) You don't need a very very fast card. Your phone will run smooth with an class 4 card, saw it with my own eyes.
Oh, I almost forgot: I think you should buy your card in a real (web)shop, not from ebay. No offense but if you buy on ebay you never know if you get a good card. Especially with this data2sd-thing it's important to have a good card. But that's just my point of view.
Anyway, good luck & have fun with your Desire
Sent from my HTC Desire using XDA App

hello
Having tried different SD card. (class 4 to 6 - 10) for the data2sd or D2EXT, I still recommend a class 10.
but a little attention as stated above, there are many bad card cheap on Ebay. Prefer to buy a card at a site known or a shop.

bart-n said:
I mean that if you run a benchmark, you will probably get better results with cards that are rated with a higher class. So with a class 6 (or 8 or 10) you will get a better benchmark result. But, my point is, a class 4 card is good enough to use for data2sd and that stuff (as used in starburst rom) You don't need a very very fast card. Your phone will run smooth with an class 4 card, saw it with my own eyes.
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After a lot of heartache in actually getting the original Desire I bought (original sale is still being disputed in paypal), I ended up buying a 2nd one that had a 4GB Class 4 included with it. Win!
I got an unbranded one, so so far I haven't run out of room (its day 2, give me a week. haha), but its good to know its at least one less thing to worry about if I do go ahead with the ROM

I understand where your coming from about Ebay with the dodgey chinese imports but take a look under the 16GB card on the accessories forum. I cant post a link because im still classed as a Noob lol
A comment the accessories forum on this SD was........
"I used h2test 1.4 with a micro sd adapter to test the speed with the test reading and writing 1GB of data
The test yielded results of 15.5 MB/s write and 16.8 MB/s read."
Ive ordered mine because the 720p is laggy when recording and i was a class 10 for best performance. and for £18 you cant go wrong for a 16GB class 10 Micro SD! Seriously i know where you coming from with Ebay but this is 100% genuine. Good cards and shipped from the UK!!!

bart-n said:
Hi!
I am using a 16GB class 4 from SanDisk. I have 15GB fat32 and a 1GB ext partition with Oxygen 2.0 and Data2SD. Absolutely no lags at all, just fine. Class 4 is good enough. You won't set the best result in benchmarks, but I personally don't care about benchmarks. As long as everything is going smooth i'm happy.
Size is a choice you have to make yourself. 1GB for apps is enough for me. Music and stuff on the fat32 partition. It depends on what you want.
I hope this helps.
Click to expand...
Click to collapse
Wow, I thought Data2SD only worked with Sense ROMs (and not even all Sense ROMs). Oxygen 2.0 is AOSP right?

I have been running a 16gb class 10 cheap sd card from lowpricememory for a few weeks with data2sd (Starburst and cool Z), the card was tested with write speeds of around 15MB/s and worked ok for a couple of weeks.
However I then started to get errors, with the card mounting as read only and also the odd crash.
I have since swapped to a Sandisk 8GB mobile ultra class 4 card, although the sequential write speed of the Sandisk is only about 6MB/s, the random write speed of small blocks of data is way higher than my original class 10 card.
The Sandisk card makes the phone seem faster, also the quadrant score has improved from 1600 to 2000.
I have formatted and tested the card from lowpricememory for errors since I removed it from my phone, none were detected, so I think that the card is fine, just not suited to running in a phone with data2sd.
It does seem to be that its not all about card class, you need to look into how fast a card can random write smaller blocks of data.
Tests of both cards are below.
Sandisk Ultra mobile 8Gb class 4
-----------------------------------------------------------------------
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 : 18.715 MB/s
Sequential Write : 6.166 MB/s
Random Read 512KB : 18.236 MB/s
Random Write 512KB : 1.150 MB/s
Random Read 4KB (QD=1) : 2.767 MB/s [ 675.7 IOPS]
Random Write 4KB (QD=1) : 1.584 MB/s [ 386.6 IOPS]
Random Read 4KB (QD=32) : 2.712 MB/s [ 662.1 IOPS]
Random Write 4KB (QD=32) : 1.301 MB/s [ 317.7 IOPS]
Test : 100 MB [I: 0.8% (63.8/7572.0 MB)] (x5)
Date : 2011/04/20 20:09:44
OS : Windows Vista Business Edition SP2 [6.0 Build 6002] (x64)
Lowprice memory 16GB class 10
-----------------------------------------------------------------------
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 : 18.265 MB/s
Sequential Write : 15.832 MB/s
Random Read 512KB : 18.213 MB/s
Random Write 512KB : 1.428 MB/s
Random Read 4KB (QD=1) : 3.521 MB/s [ 859.5 IOPS]
Random Write 4KB (QD=1) : 0.011 MB/s [ 2.6 IOPS]
Random Read 4KB (QD=32) : 3.575 MB/s [ 872.8 IOPS]
Random Write 4KB (QD=32) : 0.019 MB/s [ 4.7 IOPS]
Test : 100 MB [I: 0.0% (0.0/14.9 GB)] (x9)
Date : 2011/04/23 23:05:10
OS : Windows Vista Business Edition SP2 [6.0 Build 6002] (x64)

well, with class 10 cards and Data2sd type of scripts, I always had LOTS of lag, it was horrible.
in the mean time i decided to try an 8gb sandisk mobile ultra as well and I'm really happy. My experience is about the same as mps711.
A few weeks ago I posted this: http://forum.xda-developers.com/showthread.php?p=12861248#post12861248

microSDHC Measured Speeds

Lots of grumbling about the microSDHC that Samsung is shipping with the GS4G, which does carry a "Class 2" stamp on it, but just how fast is it?
Tests were performed using a Lenovo T410s, Windows 7, ChkFlsh v1.16.1, and an Elago microSDHC Nano II USB reader. Tests were against the raw device.
Tested were
Samsung OEM 16 GB -- 14.9 MB/s read, 7.5 MB/s write
Transcend 8 GB, Class 6 -- 14.8 MB/s read, 11.1 MB/s write
AData 8 GB, Class 6 -- 14.9 MB/s read, 11.1 MB/s write
Given these results, I'm finding the all the bashing and reported "slowness" of the card a little harder to give a lot of weight to.
Even if the write speed is a little slower (or even a lot slower), that the read speed is comparable suggests to me that most things (like launching an app from /media/) wouldn't be significantly sped up by a Class 6 or Class 10 card. Maybe I'm missing something because of potential read bottlenecks in the reader or host USB controller that wouldn't be present in the physical device, but jeeze -- all of Angry Birds can be read off the card in a second.

My class 10 will be here Friday, I can let you know how that compares to the class 2 that came with it.

I benchmarked both of my cards in CrystalDiskMark (64-bit) in Windows 7 64bit. The cards were both placed into a Micro->Mini adapter. Here's what I came up with. Left side is Samsung 16GB, right side is my Transcend card.
As you can see, for random 4K block performance, the Trasncend beats out the Samsung by a good amount. Not sure how often the phone actually encounters that type of usage. Also, I don't believe the numbers on the bottom row matter for the phone. That's with a Queue depth. I think it only matters on a PC using NCQ (Native Command Queuing).
Random write performance is pretty horrendous for both cards.

The card that came with it keeps giving errors when I try to copy the partitions to my new c6. Might be my reader but this card doesn't seem very good. This could jave been the best phone on the market if it had a flash and a few gigs of internal storage. Not sure what theu were thinking.
Sent from my SGH-T959V using XDA App

better late than never, here are my results:
Class 2 card that came with my SGS4G -
Write: 3.3 MB/s
Read: 13.0 MB/s
Class 10 Wintec 16GB:
Write: 13.0 MB/s
Read: 14.2 MB/s
Although, on the Wintec class 10, I did see write speeds above 15 MB/s at one point.

Samsung Pro 90 MB/s and Pro+ 95MB/s

Newegg has the pro for 19.99 / 64GB! super low price
Link: http://www.newegg.com/Product/Produ...cm_re=samsung_pro_64gb-_-20-147-444-_-Product
Bestbuy has the pro+ 64GB for 29.99 (I am buying this one I think)
Link: http://www.bestbuy.com/site/samsung...=4568503&productCategoryId=pcmcat351600050003
Android 6.0 soon so call me crazy but this will be amazing upgrade for any slower cards or even for people without SD-CARD on 16gb models for example.

I have this exact card in my phone right now. You may be a bit disappointed because the phone doesn't reach those numbers. I did a couple of benchmarks with my SD card in the phone and it got about 60 read and a bit less than 30 write.
This is in contrast to what the internal memory scored: 142 read, 50 write.
I will still stand by the adage that you should buy the fastest card you can afford and, of course, don't buy the cheap stuff. This is your personal data we are talking about. Spring for the good stuff.

hbar98 said:
I have this exact card in my phone right now. You may be a bit disappointed because the phone doesn't reach those numbers. I did a couple of benchmarks with my SD card in the phone and it got about 60 read and a bit less than 30 write.
This is in contrast to what the internal memory scored: 142 read, 50 write.
I will still stand by the adage that you should buy the fastest card you can afford and, of course, don't buy the cheap stuff. This is your personal data we are talking about. Spring for the good stuff.
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Can you please run Androbench and let me know what random IO is.

max1001 said:
Can you please run Androbench and let me know what random IO is.
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Random Read: 14.09 MB/s, 3608.1 IOPS (4KB)
Random Write: 3.43 MB/s, 880.19 IOPS (4KB)

hbar98 said:
Random Read: 14.09 MB/s, 3608.1 IOPS (4KB)
Random Write: 3.43 MB/s, 880.19 IOPS (4KB)
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Blah. That's pretty bad.

max1001 said:
Blah. That's pretty bad.
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Okay, just double checked... I have the 64GB PRO not the PRO+.

hbar98 said:
Okay, just double checked... I have the 64GB PRO not the PRO+.
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Yep these 2 differ quite a lot

patt2k said:
Yep these 2 differ quite a lot
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It'll be interesting to see how much difference there is between the PRO and the PRO+ in the phone. The PRO is rated at 90MB/s read, but that depends on the hardware reading it. In my computer, the PRO reads much faster than it does in my phone.

hbar98 said:
It'll be interesting to see how much difference there is between the PRO and the PRO+ in the phone. The PRO is rated at 90MB/s read, but that depends on the hardware reading it. In my computer, the PRO reads much faster than it does in my phone.
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yea I will let you guys know I bought the pro for 19.99 it should be more then enough for me.
It will be awesome with 6.0

What I really want to know if MXPE support UHS-3 with two rows of contact to reach crazy speed up to 150 MB/s weeks of Googling hasn't turn up anything.

max1001 said:
What I really want to know if MXPE support UHS-3 with two rows of contact to reach crazy speed up to 150 MB/s weeks of Googling hasn't turn up anything.
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If you've searched that long and haven't found anything, then I'd bet that the phone doesn't support that spec. You'd think that something like that would be listed somewhere.
The best way you could probably tell would be to shine a light into the sd card slot and see if you see an extra set of pins. I looked on iFixit to see if they had a teardown guide, but didn't see anything.
So you are probably out of luck.

max1001 said:
Can you please run Androbench and let me know what random IO is.
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Click to collapse
Alrighty, so I decided to benchmark the card in my laptop, to see if there was any difference. Using CrystalDiskMark 5, 64 bit portable version in my laptop, a Lenovo Y500 with Windows 10, this is what I got:
Seq Read: 80
Seq Write: 68
Random Read: 8
Random Write: 3
In my phone, the same card gave me:
Seq Read: 60
Seq Write: 30
Random Read: 14
Random Write: 3
Will be interesting to see what others get with different cards.

Placed an order for the PRO+ at Samsung. A great deal at $32.09. It's only 64gb but the quickest so why not have the best for my main media device? If I love it I'll grab a second next sale but I bet they'll have the 128gb version out by then, huh?

SanDisk Ultra Android 128 GB microSDXC Memory Card plus SD Adapter up to 80 MB/s
I am using external sd for everything and not much info in internal memory. Sandisk support the read speed i need.
Here it is:
http://www.amazon.co.uk/gp/product/B013UDL5HU?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00

Using the Samsung Pro+ 64GB here:
Seq Read: 82.81 MB/s
Seq Write: 71.87 MB/s
Random Read: 14.54 MB/s, 3722.99 IOPS (4KB)
Random Write: 3.53 MB/s, 904.47 IOPS (4KB)

Figured I'd weigh in... 32gb Samsung EVO
Seq Read: 243.19 MB/s
Seq Write: 43.13 MB/s
Random Read: 27.65 MB/s, 7078.48 IOPS (4KB)
Random Write: 29.29 MB/s, 7499.85 IOPS (4KB)

Devarika Woulf said:
Placed an order for the PRO+ at Samsung. A great deal at $32.09. It's only 64gb but the quickest so why not have the best for my main media device? If I love it I'll grab a second next sale but I bet they'll have the 128gb version out by then, huh?
Click to expand...
Click to collapse
Backordered. Still getting sale price and will ship as soon as available. No worries and was actually the reason I ordered from Samsung instead of Best Buy as I knew Samsung would honer sales if it sold out.

For taking video on the phone, is sequential write or random write more important?

When you do a speed test, are you doing it in your computer, or in the phone?

frankrocks said:
Figured I'd weigh in... 32gb Samsung EVO
Seq Read: 243.19 MB/s
Seq Write: 43.13 MB/s
Random Read: 27.65 MB/s, 7078.48 IOPS (4KB)
Random Write: 29.29 MB/s, 7499.85 IOPS (4KB)
Click to expand...
Click to collapse
Those numbers are whack.