Develop Bugs

[Q] what SD Card class is best?

Hello,
My mSD card just died on me, I had 16gb class 2, so I have decided to buy a new one, so my question would be, which CLASS would be the best, and full usable on phone. I mean, if I'll get Class6, will I use the full potential of it on my phone? Or would Class4 be good enough? I am using A2SD, so the speed of the card is essencial for me, but I dont want to buy Class8 if I wont be able to use it on full potential.
thanks for help

I am using the " Transcend microSDHC 8GB Class 6" and it works pretty fast.
I think it's a big difference with a class2 SD Card.

Class 6 is the highest a MicroSD card can go. There is a class 10 but that's for SDXC cards for use with HD video recording etc.

appox said:
Class 6 is the highest a MicroSD card can go. There is a class 10 but that's for SDXC cards for use with HD video recording etc.
Click to expand...
Click to collapse
Thanks, didnt know this, so Class6 will be fully used by Desire?

appox said:
Class 6 is the highest a MicroSD card can go. There is a class 10 but that's for SDXC cards for use with HD video recording etc.
Click to expand...
Click to collapse
I'm using a 16gb class 10...................fast

Class 10 cards are really expensive most time. I also heard that sometimes classes don't matter. If you are using a class 4 (high quality) and a class 6 (low quality) the class 4 would be faster. But it's not always this situation.

mrbluesman said:
I'm using a 16gb class 10...................fast
Click to expand...
Click to collapse
Is that a MicroSD card or Micro SDXC card?

Transcend 8 GB Class 6 ordered off amazon for 10£, can be locked, thanks

Look at my sig for a pictural definition of what i use

Speed classes
I bought a class 6 MicroSD card, because the stock SD was defective. It is a huge leap forward!
Class 2 = 13x rating = Read (Mbit) 16.0 / Write (Mbit) 16.0 = Like 2MB min. R/W
Class 4 = 26x rating = Read (Mbit) 32.0 / Write (Mbit) 32.0 = Like 4MB min. R/W
Class 6 = 40x rating = Read (Mbit) 48.0 / Write (Mbit) 48.0 = Like 8MB min. R/W
Class 10 =66x rating = Read (Mbit) 80.0 / Write (Mbit) 32.0 = Like 10MB min. R/W
So, the x rating is equal to 1.2Mb/s (Like the standard CD-rom speed)

Charlesnasi said:
I bought a class 6 MicroSD card, because the stock SD was defective. It is a huge leap forward!
Class 2 = 13x rating = Read (Mbit) 16.0 / Write (Mbit) 16.0 = Like 2MB min. R/W
Class 4 = 26x rating = Read (Mbit) 32.0 / Write (Mbit) 32.0 = Like 4MB min. R/W
Class 6 = 40x rating = Read (Mbit) 48.0 / Write (Mbit) 48.0 = Like 8MB min. R/W
Class 10 =66x rating = Read (Mbit) 80.0 / Write (Mbit) 32.0 = Like 10MB min. R/W
So, the x rating is equal to 1.2Mb/s (Like the standard CD-rom speed)
Click to expand...
Click to collapse
The question was actualy, if the Desire CAN use those speeds, I mean, can my Desire be writing 6MBps? or can it read same speed as the best SD card?

appox said:
Is that a MicroSD card or Micro SDXC card?
Click to expand...
Click to collapse
micro sdhc, ebay, 27 quid

Zheiko said:
Transcend 8 GB Class 6 ordered off amazon for 10£, can be locked, thanks
Click to expand...
Click to collapse
i've bought two of them off amazon, both haven't lasted 3 months.
Wife's htc stock (sandisk class 4 8gb) over two year old is still good. Heck, she used it with her touch hd.

gascanieto said:
i've bought two of them off amazon, both haven't lasted 3 months.
Wife's htc stock (sandisk class 4 8gb) over two year old is still good. Heck, she used it with her touch hd.
Click to expand...
Click to collapse
Honestly, I hope you are more than just wrong... the feedbacks on this were 4 1/2 stars there, so I guessed I cannot go wrong... well, I will see

is there a software/app to check speedness of my SdCard?

Zheiko said:
The question was actualy, if the Desire CAN use those speeds, I mean, can my Desire be writing 6MBps? or can it read same speed as the best SD card?
Click to expand...
Click to collapse
Yes, the Desire can use the speeds till Class 10 (And maybe faster) WITH big files. A time back I red a comparison and difference between Class 4 and 10 was with largest file almost 10MB+ faster (for the Class10) But with small files the classes doesn't really matter, 4 or 10 Class cards will be even slow because the Desire HW is the bottleneck!

Charlesnasi said:
Yes, the Desire can use the speeds till Class 10 (And maybe faster) WITH big files. A time back I red a comparison and difference between Class 4 and 10 was with largest file almost 10MB+ faster (for the Class10) But with small files the classes doesn't really matter, 4 or 10 Class cards will be even slow because the Desire HW is the bottleneck!
Click to expand...
Click to collapse
exactly what I needed, so basicaly, for a2ext it doesnt really matters, and the apps will be loaded equally from class2 or class6, since those are very small files, right?

to my experience, d2ext has shown quite improvement over class 6 card

Get a good quality, high capacity 16GB +, class 4 card. that should do for you for a good while.

[Q] 32gb Class 4 and Class 6 Benchmarks?

I currently have a Class 2 16gb card and would like to upgrade to a 32gb, but I would like to know if Class 6+ makes any difference on the Epic.
Currently using SD Tools I get 5.6mb/s write and 17.0mb/s read on a card formatted using 64k allocation and using the 2048kb read ahead patch.
Could someone run SD Tools with a Class 6 (or higher) and a Class 4 card?
Thanks.

tbob18 said:
I currently have a Class 2 16gb card and would like to upgrade to a 32gb, but I would like to know if Class 6+ makes any difference on the Epic.
Currently using SD Tools I get 5.6mb/s write and 17.0mb/s read on a card formatted using 64k allocation and using the 2048kb read ahead patch.
Could someone run SD Tools with a Class 6 (or higher) and a Class 4 card?
Thanks.
Click to expand...
Click to collapse
I went and bought a class 6 sdcard from "lexar". And my benchmarks using "sdcard speed" went up a good bit. But the class 6 card cost about $100, with shipp8ing and all. I heard that there's a lot of cheap quality class 6 cards out there that don't give you a increased read/write speed boost over a class 2. So be careful on what brand sdcard you buy...
I get a 12mb/s to 14mb/s write speed, and a 62mb/s read speed with my "lexar" 16gb class 6 sdcard... using 3072 cache size
Sent from my SPH-D700 using XDA App

sniperkill said:
I went and bought a class 6 sdcard from "lexar". And my benchmarks using "sdcard speed" went up a good bit. But the class 6 card cost about $100, with shipp8ing and all. I heard that there's a lot of cheap quality class 6 cards out there that don't give you a increased read/write speed boost over a class 2. So be careful on what brand sdcard you buy...
I get a 12mb/s to 14mb/s write speed, and a 62mb/s read speed with my "lexar" 16gb class 6 sdcard... using 3072 cache size
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
That seems very speedy for a phone. Wonder what speed a Class 4 would get.
I don't mind paying a bit more. I usually stick with name brand memory chips (sandisk, lexar, kingston, pny). I prefer Sandisk, but I've only seen class 4 32gb chips so far.

tbob18 said:
That seems very speedy for a phone. Wonder what speed a Class 4 would get.
I don't mind paying a bit more. I usually stick with name brand memory chips (sandisk, lexar, kingston, pny). I prefer Sandisk, but I've only seen class 4 32gb chips so far.
Click to expand...
Click to collapse
You probably won't find a class 6 anywhere in the stores. You gotta order them. I got mine from www.lexar.com also, I wouldn't buy from kingston, or pny. I heard they had problems with certain ones...
Sent from my SPH-D700 using XDA App

My komputer bay is 5/15 32gb
Sent from my SPH-D700 using XDA Premium App

tbob18 said:
I currently have a Class 2 16gb card and would like to upgrade to a 32gb, but I would like to know if Class 6+ makes any difference on the Epic.
Currently using SD Tools I get 5.6mb/s write and 17.0mb/s read on a card formatted using 64k allocation and using the 2048kb read ahead patch.
Could someone run SD Tools with a Class 6 (or higher) and a Class 4 card?
Thanks.
Click to expand...
Click to collapse
I get 10 write 24 read on my class 4 16gb sandisk with a 1024 patch. 1024 seems to work slightly better for my card than 2048, and definitely better than other options I've tried. That 60 read sounds a little extreme to me. Leaves me wondering how you managed to squeeze so much more out of a class 6 of similar quality brand.
Sent from my SPH-D700 using XDA Premium App

RECOMEND a Micro SD Class 10

I want some of you who already have Micro SD class 10 or at least have some expirience to recomend me what is the best i can get
I saw some Samsung Class 10 Micro SD card 8 and 16 GB im wondering betwen 8 and 16 i dont need 32 lol
But what im asking is .... for opinion what brand you will choice and for example what is the best choice to worth the money
i guess if i get 8GB class 10 will be better than 16 GB class 10
The main reason to use it is
I want to use it on my Wildfire with Ext4 and Data2SD to partition like 1GB internal space and the other left space to use of Music Pictures documents Movies etc
So i think if the card is smaller will be even faster for the whole device
Thanks in advance
for now i stop on SAMSUNG buttt i want opinion

I'm using Strontium 16GB class 10 on my HTC One V and I usually get 16 MB/s of minimum speed..

JalmiNyondong1933 said:
I'm using Strontium 16GB class 10 on my HTC One V and I usually get 16 MB/s of minimum speed..
Click to expand...
Click to collapse
Mee 2
Sent from my HTC Wildfire S A510e using XDA

I got one of the Samsung 16G class 10 cards last week as it was great value. So far no probs & write speed of 12.5MB/s

[Q] 16GB class 2 vs. 32 GB class 4

I currently have 16 GB class 2, and i am about to but 32GB class 4.
what is the diffrences beetween them ?
The games will work smother with class 4?

I have a 32 GB class 10 micro sd card, bit I didn't really notice any difference in speed compared to the 8 GB class 2 micro sd that came with the phone...
Sent from my R800i using XDA

The class rating of an Sd card is based of off its Write speed. So a 16gb class 2 would write at 2mb per second, the 32 gb class 4 will be able to write at 4mb per second, There is a slight "catch" however when using larger storage Sd cards, its been explained to me in the past that when you go up in storage it takes the device (phone, pc, camera ect.) longer periods of time to initially read the card itself because its now reading through more storage space then before (even if that space is empty in places).
With that in mind, the 32gb class 4 will Write files to it self at a faster speed then the 16gb class 2, but it will take your phone longer periods of time to access the information on the larger Gb card, so will games play smoother off your Sd card, technically no, they wont. But what you will achieve are faster data transfer rates when moving files to and from.
Also take into account that the class rating system isnt exactly perfect. For instance my 32gb class 4 is rated to write at 4mb per second, but its achieved 6mb per second depending on the files, and Im currently using a 32gb class 10 which most of the time writes data at 12mb per second.
I hope this helps

I think the best would be those samsung or sandisk ultra class6 cards.

julianpaul said:
I think the best would be those samsung or sandisk ultra class6 cards.
Click to expand...
Click to collapse
I'm using a Samsung 32gb class10 "high speed series" as marketed per Samsung, it works very well. But what works for me isn't always for everyone
Sent from my R800x on CM9

I just bought one of these a couple weeks ago, it was $29.95 free shipping but its still a great price and its getting consecutaively around 7-8mbps. I replaced my 32gb Sandisk class 4 with it... I had the $$ and figured why not.
http://www.adorama.com/IDSMUMSD32G....ate&utm_campaign=Other&utm_source=rflaid62905

Why don't you just bought class 10 SD card..?
How much the price different between class 4 and class 10 btw...?

I dont wanna start a you know what measuring contest here but . . .
Samsung "High Speed Series" I bought from ebay 38$
http://www.ebay.com/itm/Samsung-32G...gital_Camera_Memory_Cards&hash=item2c61981fc1
10-12 mb's per second
Even though Samsung it's selling for 80$ direct from manufcaturer, heres the specs link from their site
http://www.samsung.com/us/computer/memory-storage/MB-MSBGA/US-specs

OK!!! Thanks

dhani88_TotallyNooob said:
Why don't you just bought class 10 SD card..?
How much the price different between class 4 and class 10 btw...?
Click to expand...
Click to collapse
There was some other thread around where people found that class10 cards had higher latency and slower access times than the class4 ones. So they're not really suited for mobile phones where quick data access is more important than high transfer rates.

julianpaul said:
There was some other thread around where people found that class10 cards had higher latency and slower access times than the class4 ones. So they're not really suited for mobile phones where quick data access is more important than high transfer rates.
Click to expand...
Click to collapse
I still believe storage size has a greater effect on access time then the class rating, classes are read/write speeds but more space takes longer time to read. The class itself being suitable, depends more upon the manufacturer of the sd card, and the manufacturer of the device and the device its being used in. A 4gb class10 is going to give you great performance in your device where as a 32gb class10 will indeed function a little slower but depends if you need all that space or not. I'm no expert but that has been my experience.
Sent from my R800x using CM9

jgregoryj1 said:
I just bought one of these a couple weeks ago, it was $29.95 free shipping but its still a great price and its getting consecutaively around 7-8mbps. I replaced my 32gb Sandisk class 4 with it... I had the $$ and figured why not.
http://www.adorama.com/IDSMUMSD32G....ate&utm_campaign=Other&utm_source=rflaid62905
Click to expand...
Click to collapse
Yeah, I have that card too and it's a big improvement from my prior 16GB class2 Sandisk card

I have my 32gb class 4 sandisk on my xperia. So far so good with games.
Sent from my R800i using XDA

I've got a sandisk 32 gb class 4 and I tried out my bros class 10 32 gb, can't remember what make it was but damn is that thing fast read/ write speeds are great and playing games is cherry pie
Sent from my R800a using XDA App

Would it hurt an sd card to bump up the read/write speed beyond what the card is rated for?
Sent from my R800x using Tapatalk 2

beez1717 said:
Would it hurt an sd card to bump up the read/write speed beyond what the card is rated for?
Sent from my R800x using Tapatalk 2
Click to expand...
Click to collapse
It will decrease its "lifespan" but probably won't kill it, I think the apps2sd script bumps things up drastically and I didn't have any troubles for the while I was using it, but the SD card manufacturer and its class might have some effects on the bumped up lifespan .. probably good to at least make sure you have a spare!
Sent from my R800x using xda premium

I indeed have a spare one that I am using in my OG droid. Lol. I use that phone as an ipod touch like device. Too bad I don't have a sim card because I'm on cdma. If I were, then I could use my OG droid when I want to use a slimmer phone that has a physical keyboard. However, SwiftKey has me not missing my physical keyboard.
Sent from my R800x using Tapatalk 2

[Q] sd card 16 Gb calss 4 !

in my country we don't have memory card with calss higher calss 4 to 16 GB or calss 6 to 8 G.B !
which one should i buy ?
and i wana ask 16 gb with calss 4 will be bad ?
now i have 4 Gb with calss 4 too
but i didn't feel any bad thing
plz any one help me becouse i wana buy the memory tommorow

I think anything within 32GB is fine.
Sent from my 4.1 running Galaxy W.

iDelta said:
I think anything within 32GB is fine.
Sent from my 4.1 running Galaxy W.
Click to expand...
Click to collapse
there is 32 GB in my contry but also calss 4
do you advice me to buy it ?
and i heard that the calss 4 is slow but i don't how it will slow and slow in where in games or on imges or what i don't know ?!

a7med mo7sen said:
there is 32 GB in my contry but also calss 4
do you advice me to buy it ?
and i heard that the calss 4 is slow but i don't how it will slow and slow in where in games or on imges or what i don't know ?!
Click to expand...
Click to collapse
Class 4 shouldn't be a problem.
Sent from my 4.1 running Galaxy W.

?
iDelta said:
Class 4 shouldn't be a problem.
Sent from my 4.1 running Galaxy W.
Click to expand...
Click to collapse
what sd card do you use in your phone and what calss of it
and sorry can you explain what diffrence btween sd cards with 6 calss or 4 or 10 ?
i notecied that the sd cards which have a high calss its too expensive
and thanx for help :good:

a7med mo7sen said:
what sd card do you use in your phone and what calss of it
and sorry can you explain what diffrence btween sd cards with 6 calss or 4 or 10 ?
i notecied that the sd cards which have a high calss its too expensive
and thanx for help :good:
Click to expand...
Click to collapse
I use a SanDisk class 4 8GB card and scan time takes only 25 seconds.... though I think that time is only hindered by the stuff you have on your phone... as for class, I'll go and check it out.
Sent from my 4.1 running Galaxy W.

a7med mo7sen said:
what sd card do you use in your phone and what calss of it
and sorry can you explain what diffrence btween sd cards with 6 calss or 4 or 10 ?
i notecied that the sd cards which have a high calss its too expensive
and thanx for help :good:
Click to expand...
Click to collapse
I think it is differ at the read and write speed of sdcard. Maybe it will effect the game, if you swap the sdcard. Then when it need to read data from sdcard, the higher class will make it faster. Just what i understand about that. Correct me if i'm wrong
Sent from my CM10.1 Wonder using xda premium

Class 2 is the slowest SD card speed. It had a write speed of about 2MBPS and is suitable for standard video recording. Class 4 and class 6 have 4 and 6 MBPS write speed respectively and can be used for HD Video recording. Class 10 (obviously) has a 10MBPS write speed and beyond that is the UHS speed cards that can go up to 312MBPS.
(Source: http://sdcard-speed-guide.articles.r-tt.com/)
Google is your friend.
Sent from my 4.1 running Galaxy W.

a7med mo7sen said:
what sd card do you use in your phone and what calss of it
and sorry can you explain what diffrence btween sd cards with 6 calss or 4 or 10 ?
i notecied that the sd cards which have a high calss its too expensive
and thanx for help :good:
Click to expand...
Click to collapse
Speed Classes 2, 4, and 6 assert that the card supports the respective number of megabytes per second as a minimum sustained write speed for a card in a fragmented state.
You should utilize only UHS Speed Class.
Class 2,4,6,10 are laggy.

babyscouts said:
Speed Classes 2, 4, and 6 assert that the card supports the respective number of megabytes per second as a minimum sustained write speed for a card in a fragmented state.
You should utilize only UHS Speed Class.
Class 2,4,6,10 are laggy.
Click to expand...
Click to collapse
And I thought I saw the last of you...
Sent from my 4.1 running Galaxy W.

babyscouts said:
Speed Classes 2, 4, and 6 assert that the card supports the respective number of megabytes per second as a minimum sustained write speed for a card in a fragmented state.
You should utilize only UHS Speed Class.
Class 2,4,6,10 are laggy.
Click to expand...
Click to collapse
I disagree. Even at class 8, the sd card is said to be fast enough to be used as ram. Pretty sure anything you load from a class 8 and above card will be fast enough. UHS might be overkill (more performance than needed, waste money)
As for class 4 or 6,if the price difference is huge, just go for class 4. Put your programs on internal storage and stuffs that don't need high speed communication with your cpu such as pictures, video,unused files, etc can be placed in external.

egagah said:
I disagree. Even at class 8, the sd card is said to be fast enough to be used as ram. Pretty sure anything you load from a class 8 and above card will be fast enough. UHS might be overkill (more performance than needed, waste money)
As for class 4 or 6,if the price difference is huge, just go for class 4. Put your programs on internal storage and stuffs that don't need high speed communication with your cpu such as pictures, video,unused files, etc can be placed in external.
Click to expand...
Click to collapse
Dude, all she wants is you to spend money on senseless stuff. Don't bother wasting your energy on him...
Sent from my 4.1 running Galaxy W.

edit: deleted. Tapatalk error! sorry