Develop Bugs

Best microSDHC card

Hello!
I want to buy new microSDHC card to my phone and I'm wondering which one is the best.
There are three priorities for me:
- SDHC
- 4GB
- minimum class 6
I found TRANSCEND microSDHC 4GB Class 6 and SILICON POWER 4GB microSDHC CLASS 6. Which one is better? Or maybe you advice something else?

THere is a lot of disscussion about this in this forum. Please search

Sometimes it's hard to find sth when does not speak the native english. Can you please give me the link to this discussion or just post the answer?

http://forum.xda-developers.com/showthread.php?t=553412&highlight=sdhc
http://forum.xda-developers.com/showthread.php?t=416866&highlight=sdhc
http://forum.xda-developers.com/showthread.php?t=493247&highlight=sdhc

Thanks! I've already studied thread nr 1 and 3 and nothing special there. Number 2 is 16GB and 32GB - I need just 4GB and not for WM but for Linux (ext4 and maybe one fat32 partition on it).

well if it's a pda device then it's interface cant keep up with even the normal card speeds
so high speed cards only really matter when you have it connected to a card reader connected to a computer

Rudegar said:
well if it's a pda device then it's interface cant keep up with even the normal card speeds
so high speed cards only really matter when you have it connected to a card reader connected to a computer
Click to expand...
Click to collapse
So it's better to buy class 4 but 8GB that 4GB class 6?

i have not seen any difference personally between 4 & 6. so go for highest capacity.
i have used quite a few brands and all my cards now are sandisk. None of them have given me a problem.
most important thimg regarding performance is to make sure that its genunine. more than 85% of cards sold these days are duplicate.

michal_banszel said:
Thanks! I've already studied thread nr 1 and 3 and nothing special there. Number 2 is 16GB and 32GB - I need just 4GB and not for WM but for Linux (ext4 and maybe one fat32 partition on it).
Click to expand...
Click to collapse
I don't know jack about linux or 'rooting' onto an sd card, but if I were going to do it, I would make sure that I got the highest quality card available. I've corrupted my 16 G card too many times (mostly my fault, lol) to trust it for running linux off of it. Get something hardy that won't become corrupted, like if the device freezes and you need to reset it. My guess is that you're better off with a smaller card (like the 4 GB one). I'd stay away from a big one if you don't need it.
Basically, it's a huge PITA when your card becomes hopelessly corrupted and you need to back it up and re-format it. I imagine it's a nightmare when your operating system is running off of said card when it becomes corrupted.

Farmer Ted said:
I don't know jack about linux or 'rooting' onto an sd card, but if I were going to do it, I would make sure that I got the highest quality card available. I've corrupted my 16 G card too many times (mostly my fault, lol) to trust it for running linux off of it. Get something hardy that won't become corrupted, like if the device freezes and you need to reset it. My guess is that you're better off with a smaller card (like the 4 GB one). I'd stay away from a big one if you don't need it.
Basically, it's a huge PITA when your card becomes hopelessly corrupted and you need to back it up and re-format it. I imagine it's a nightmare when your operating system is running off of said card when it becomes corrupted.
Click to expand...
Click to collapse
That's right!
"most important thimg regarding performance is to make sure that its genunine. more than 85% of cards sold these days are duplicate."
what do you mean? TRANSCEND and SILICON POWER are genuine?

on my purpose,there ARE differences between class 4 and class 6 ,but there are to small differences in speed to pay the double price...I just using class2 Devices (on 3 PDA Phones,2 NDS and an PSP),i never felt there are to slow,yeah on PSP you really fell the difference between an MemoryStick Pro MkII and an Class2 Toshiba MicroSDHC,but for me personally it does not matter -the most of People buy Great Capacity Drives for Media Files right ? ....and Media Files like Movies,Mp3´s etc. running well on Class2 Cards!

Excuse me to say that...but SanDisk Sucks!
a lot of the Sandisk card have Chips from China
(i Don´t know on Class 4 or 6 Cards,but Class2 Card from Sandisk always have Chinese Chips....and there bullsh...)
Japanese Chips (like Cards from Kingston and Toshiba) are a lot better on speed and are a lot more reliable than Chinese Chips
I made my Experiences ,never by SanDisk....
just every Media Market have SanDisk- but that doesn´t mean there are really good..
I have Cards from Siemens,SanDisk,Kingston,Nokia,Toshiba and Motorola (Nokia,Siemens and Motorola are OEM- so i don´t know who produced them)) I have over 20! Cards between 64mb and 16gb---yeah and San Disk are the worst ..dood!
and there IS a Difference between Class4 and 6 Cards,but i think personally there are to less to pay the double Price for it
I have 3 PDA ,2 NDS and an PSP,all of them has Class 2 Cards and i never felt that there are to slow...most of the Devices on the market are to slow to feel the REAL Power of an Class6 Card!

What is difference in SD card classes

Ok I have an Acer Iconia a500, currently I have only a 6gb card installed. Now when i look online i see that the micro sd cards are rated by classes. What is that for?
I need a 32gb for my Iconia. I do alot of school work from it. Just want the storage for my school books. any way, can someone break it down for me?
Thank You
Sent from my A500 using XDA Premium App

The SD card's class represents the least write speed.
Class 2: 2MB/s
class 4 : 4MB/s
and so on..

I think it's so you can copy and read files faster

ok, got it, higher the class the faster the write speed.
One more thing, now, the higher the class, does anyone know if they have more problems? like with crashing, or having to be re formatted often?

primus123 said:
ok, got it, higher the class the faster the write speed.
One more thing, now, the higher the class, does anyone know if they have more problems? like with crashing, or having to be re formatted often?
Click to expand...
Click to collapse
Nope, problems/crashing etc would be down to quality not size.
Also faster write speed doesn't mean it performs faster when used as a "hard drive" like in a phone, so lower class ones can outperform higher, but you'd have to try them to see.
It's because they're designed with things like cameras in mind, where getting the image saved quickly so you can take another one is the most important thing.
In a mobile phone/tablet they're accessed more randomly, and that is where it's been found that some higher class cards don't perform as well.

Mini SD cards, so tiny for my big hands.
Those mini sd cards are SOOOOO small, I've lost a few over the past 3 years.

so which one should i get for my iconia

androidappdeveloper said:
Those mini sd cards are SOOOOO small, I've lost a few over the past 3 years.
Click to expand...
Click to collapse
Tell me about it, I just reordered one after giving up the search on my current one. It's not completely lost, I'll probably come across it one day when re-organizing the room.

I keep mine in those Sd card cases and shove it in a crown royal bag....

You're probably fine with a Class 2 microSD card, as you won't have large files (or a large amount of small files) written in a short time.

Write speeds are generally the most important feature of a memory card. Write speeds determine the amount of time it takes to transfer the data, the moment you for example, click the button on your camera to ask the camera to take the image. You will probably remember that back in the early days of SD memory cards, there was an awful amount of lag time on cards, i.e from when you heard the click on the button (when you asked your camera to take the picture), to when you heard the double click (which is normally when the image has been written to the card).
Read speeds indicate the amount of time it takes for a card to transfer the data to a PC/Laptop. I.e the amount of time it takes to read the data off the card. Generally the higher the capacity of the card, this will naturally give a higher write speed. So if you have a 32GB card full of data and its only a class 2, it would take much longer than a 32GB card thats class 10, to send all the info to your pc etc.
Class 10 cards are recommended for HD video, or minimum class 6 really. You will probably find a 16GB class 4 card for example, will not work on say a Samsung HD Camcorder. It will maybe store only 1 minute of video, as for some reason the HD cannot write the data to the card fast enough it would seem.

Anyone ever lose a mini SDK card?

Plus your SD class is high, more it is fast...

jerryfranks said:
Anyone ever lose a mini SDK card?
Click to expand...
Click to collapse
Yes, almost (I found it after w hile), bloody spring so strong it shot across the room!
Pity there's not some little leatherette folder with tiny slots for a few MicroSD cards, I'd buy one!.

iloveapple said:
Write speeds are generally the most important feature of a memory card. Write speeds determine the amount of time it takes to transfer the data, the moment you for example, click the button on your camera to ask the camera to take the image. You will probably remember that back in the early days of SD memory cards, there was an awful amount of lag time on cards, i.e from when you heard the click on the button (when you asked your camera to take the picture), to when you heard the double click (which is normally when the image has been written to the card).
Read speeds indicate the amount of time it takes for a card to transfer the data to a PC/Laptop. I.e the amount of time it takes to read the data off the card. Generally the higher the capacity of the card, this will naturally give a higher write speed. So if you have a 32GB card full of data and its only a class 2, it would take much longer than a 32GB card thats class 10, to send all the info to your pc etc.
Class 10 cards are recommended for HD video, or minimum class 6 really. You will probably find a 16GB class 4 card for example, will not work on say a Samsung HD Camcorder. It will maybe store only 1 minute of video, as for some reason the HD cannot write the data to the card fast enough it would seem.
Click to expand...
Click to collapse
Very helpfully post,thanks.
Sent from my GT-I9000 using Tapatalk

Try to continue promoting of you site.

Hi speed cards are more efficient at presenting and recording. It's really up to you. If you buy the cheaper version and it doesn't present at the speed you think it should you'll have answered your own question.

You guys have it mostly right. The higher class your card is the faster it can write a file to its memory, the trade off is that the higher class cards have slower rapid access speeds, something to do with how it prepares files before writing. Basically, a class 10 will write a 1GB file faster, but if you try to write 15 3MB files quickly your performance will suffer. For something like a phone I recommend a class 4 or 6. For cameras I'd go higher (I don't know a whole lot about cameras).

seems like its good

[Q] InsertCoin MAX size for ext?

Hello !
Sry for posting this here.. I'm still too new to post on dev threads =(
It's a question for ppl who use InsertCoin..
I got a 16gB microSD yesterday, so I want partition it for more ext..
But I saw this.. www[dot]miui-au[dot]com/faq/a2sd
If you go over 2Gb you may experience SD Card corruption and the Market will not operate properly!
Click to expand...
Click to collapse
And I saw somebody saying that the maximum ext that I should get is 1.5 gB at InsertCoin's main thread.. I'm not sure.. (I couldn't find that post anymore =\)
Does anyone know if there's a limit for MAX EXT using InsertCoin?
Thanks a lot !

ercliou said:
Hello !
Sry for posting this here.. I'm still too new to post on dev threads =(
It's a question for ppl who use InsertCoin..
I got a 16gB microSD yesterday, so I want partition it for more ext..
But I saw this.. www[dot]miui-au[dot]com/faq/a2sd
And I saw somebody saying that the maximum ext that I should get is 1.5 gB at InsertCoin's main thread.. I'm not sure.. (I couldn't find that post anymore =\)
Does anyone know if there's a limit for MAX EXT using InsertCoin?
Thanks a lot !
Click to expand...
Click to collapse
1GB ext is enough mate
Tried and tested

vashishtuday said:
1GB ext is enough mate
Tried and tested
Click to expand...
Click to collapse
I concur, more than that is a waste of space and decreases the r/w speed.

1 GB is recommended, in my case i use 2GB as i need space to sync my emails and other data. As rightly mentioned by paul.c more the space the more the time it takes to read and write and eventually the performance decreases. It also depends on what type of sdcard you are using, like class4, class 5 and so on.......

I had 1GB but wasn't enough 2GB will have a lot of problems, 1,4-1,5GB is max I recommend you for insertcoin.. I don't have any problems , 1.43GB ext

paul.c said:
I concur, more than that is a waste of space and decreases the r/w speed.
Click to expand...
Click to collapse
Sry for my noobility.. but why is that?
I mean.. flash memory allows random access, so why does it decreases r/w speed?

TopGear63z said:
I had 1GB but wasn't enough 2GB will have a lot of problems, 1,4-1,5GB is max I recommend you for insertcoin.. I don't have any problems , 1.43GB ext
Click to expand...
Click to collapse
Thanks for your reply..
Could you point out what are the problems with 2GB ext?
And why do they happen?
Thanks !

I don't know why but Insertcoin became laggy as hell, never thought a class 6 16GB msd from Kingston could be the problem, but when i partioned it again i did just a little bit more than I had on my 8GB 1,3GB< and it helped a lot, Insertcoin is now working flawless.
Also another thing, idk if that's what they mean with sd card corruption but i could not move (almost) any files to my sd anymore since 2GB Ext. Got the whole time an error from windows, But why idk You should ask an expert I just don't recommend it

ercliou said:
Sry for my noobility.. but why is that?
I mean.. flash memory allows random access, so why does it decreases r/w speed?
Click to expand...
Click to collapse
Ok, here is some geek talk!
EXT is really really slow! Why, becose its on your SD card, most SD cards used in phones are Class 2 cards, they have a read/write speed of 2MBs....
Your phones internal RAM/ROM have read speeds upto 1500MB/S and write speeds of about 500MB/S (depending on what type of chips used, PC RAM is much faster)
As you can see, there is a bit of a speed difference, even a Class 10 card is slow at 10MB/s
Also the SD card speeds are restricted by default, so if you are running a Class 2 card i would say you get about 1MB/s Read/Write speed (unless you use a SD card booster)
So the bigger the EXT, the slower the software is because it will take longer to read all the information, at 2GB of EXT (2048MB) takes the phone a long time to read going at less then 2MB/S on a class 2 card

[Q] Quick question on stock sd card size

Hi Guys,
I am having a problem loading some of the new 3.0 roms that are out now...and I was wondering if this might be the issue.
I have the stock SDCARD that came with my evo4g (8gb)...but when I insert it into a card holder in my PC, it only comes up as 5.67gb total. Even when I try to format it...it only says 5.67gb.
Is that normal?
Thanks!

The biggest problem with our SD cards is the type of card it is. our "class" is really low. they SHOULD have put real cards in our phones like class 10. I personally did test both on read and write speeds while in the phone and the class 10 was MUCH faster than the stock. get a 16GB.. btw, it'll never reach 8gb, or 16gb. it'll always be less.

runcool said:
The biggest problem with our SD cards is the type of card it is. our "class" is really low. they SHOULD have put real cards in our phones like class 10. I personally did test both on read and write speeds while in the phone and the class 10 was MUCH faster than the stock. get a 16GB.. btw, it'll never reach 8gb, or 16gb. it'll always be less.
Click to expand...
Click to collapse
Yes, I understand all that...class, etc...and I know that after formatting it will not be 8gb due to 1024 equals 1gb...but 8gb down to 5.67gb? That seems a little low right?

no. because as soon as you format it and put it back onto the evo... it re-adds its stuff to the sdcard. and also.... the math isn't right. you forgot about the partition table which takes even more away. Depending on how you format it if it is fat32, NTFS, WinFS*I REALLY WISH MICROSOFT WOULD DO THIS! LOL* well, the size of the disk will change. well, I mean the amount you can use. oh and also the unit size can change it.

Do you have an ext partition on the card (for apps2sd)? That's the most likely place the extra space would go. The space you're seeing reported in Windows is the FAT32 partition.
If you don't think you have one, have you ever had one? If you thought you had gotten rid of it, it's also possible you didn't really get rid of it, depending on what you did. Just reformatting it in Windows won't get rid of it.
An 8GB (marketing) card will normally have about 7.45 GB of actual space. So you're missing roughly 1.75 GB.

[Q] Roehsoft Ram Expander (swap)( How to use)

Please guys , who can explain me how to use this apps, and which SD CARD is good to use this ?
Thanks.:good:

sarres said:
Please guys , who can explain me how to use this apps, and which SD CARD is good to use this ?
Thanks.:good:
Click to expand...
Click to collapse
brother let me tell you something for benefit of your sd card
PLEASE PLEASE DO NOT USE SWAP
it kills your sd card
my 16 gb sd ard class 10 died during swapping
so if you have more money to waste and think you can buy one then go for it otherwise not
please thinks twice before swapping and i dont think 1 gb ram of grand is less then why use this
good luck
:laugh::good::good::good:

sarres said:
Please guys , who can explain me how to use this apps, and which SD CARD is good to use this ?
Thanks.:good:
Click to expand...
Click to collapse
That RAM swapper will not work for our grand duos, mainly because we currently do not have a custom kernel (you need a custom kernel has SWAP support) for this application to work.
I can go into detail and explain how it works anyway if you like but the basic thing is, that application will not work on our sgg.
Try their second application - Memory Swap checker, to confirm what I'm telling you - https://play.google.com/store/apps/details?id=com.roehsoft.meminfo
I disagree with @aditya rathee about the dying sd card due to swap, if done right it works like a charm. I have used swap on several of my phones as well as this particular application on my Xperia J. It simply uses the empty space from your sd card to create swap file and uses it as virtual RAM for your applications to run in the background. Usually it is adviced to use Class 6+ SD card for these kind of things, but minimum requirement is Class 4. Personally I have tested it on Class 6 and currently using it on Class 10 SD card.

iceyhotguy said:
That RAM swapper will not work for our grand duos, mainly because we currently do not have a custom kernel (you need a custom kernel has SWAP support) for this application to work.
I can go into detail and explain how it works anyway if you like but the basic thing is, that application will not work on our sgg.
Try their second application - Memory Swap checker, to confirm what I'm telling you - https://play.google.com/store/apps/details?id=com.roehsoft.meminfo
I disagree with @aditya rathee about the dying sd card due to swap, if done right it works like a charm. I have used swap on several of my phones as well as this particular application on my Xperia J. It simply uses the empty space from your sd card to create swap file and uses it as virtual RAM for your applications to run in the background. Usually it is adviced to use Class 6+ SD card for these kind of things, but minimum requirement is Class 4. Personally I have tested it on Class 6 and currently using it on Class 10 SD card.
Click to expand...
Click to collapse
sir it may have worked good for you but my sd ard was sandisk 16 gb class 10 i can send you its photo if you dont believe
also swapping increases reading writing cycles of sd card which results in damage

aditya rathee said:
sir it may have worked good for you but my sd ard was sandisk 16 gb class 10 i can send you its photo if you dont believe
also swapping increases reading writing cycles of sd card which results in damage
Click to expand...
Click to collapse
I'm not disagreeing with you on the fact that swapping decreases the life of the sd card. Yes, sd cards are made in a way that they have only so many read/write cycles, and using them for swap will essentially allow your system and applications to use that swap file/partition over and over again which would decrease the life of your sd card in the long term but NOT right away. You definitely would need to replace your sd card after a year maybe two depending on your usage but that's the cost you have to pay if you need more virtual RAM.
In your previous post you mentioned that your sd card died "during" swapping. That happening is very very unlikely, unless you had really bad luck or you were using an old SD card that had already been used a lot.

iceyhotguy said:
I'm not disagreeing with you on the fact that swapping decreases the life of the sd card. Yes, sd cards are made in a way that they have only so many read/write cycles, and using them for swap will essentially allow your system and applications to use that swap file/partition over and over again which would decrease the life of your sd card in the long term but NOT right away. You definitely would need to replace your sd card after a year maybe two depending on your usage but that's the cost you have to pay if you need more virtual RAM.
In your previous post you mentioned that your sd card died "during" swapping. That happening is very very unlikely, unless you had really bad luck or you were using an old SD card that had already been used a lot.
Click to expand...
Click to collapse
my class 10 sd card was just one year was that not enough

iceyhotguy said:
That RAM swapper will not work for our grand duos, mainly because we currently do not have a custom kernel (you need a custom kernel has SWAP support) for this application to work.
I can go into detail and explain how it works anyway if you like but the basic thing is, that application will not work on our sgg.
Try their second application - Memory Swap checker, to confirm what I'm telling you - https://play.google.com/store/apps/details?id=com.roehsoft.meminfo
I think the stock kernel does support swap becz if you enter
Cat /proc/cpuinfo you will get the following result and it features it says swp
Sent from my GT-I9082 using XDA Premium 4 mobile app
Click to expand...
Click to collapse

Deleted

Thanx a lot !!!
i will not try this on my sgg.
thanx :good::good::good:

Swap supported kernels for Galaxy Grand Duos?
Are there swap supported Kernels or ROMS for galaxy grand duos? If there are any plz give me a Download link.

Kernel with swap support?
Is there any kernel with swap support for grand?

partition sd card
what if I partition the sd card let say i have a 64gb class 10 sd card and partition 60gb as fat32 and the remaing 4gb as fat32 also and use the separated 4gb for Roehsoft Ram Expander so that it will not affect the remaining storage encase the ram expander really kill sd card, would that be possible?

Frost Kernel Supports the swap
nuhad13320 said:
Are there swap supported Kernels or ROMS for galaxy grand duos? If there are any plz give me a Download link.
Click to expand...
Click to collapse
srlkr said:
Is there any kernel with swap support for grand?
Click to expand...
Click to collapse
The only kernel i found which support the Ram Swap is Frost kernel for our grand duos. it also the stable and smooth. I increased my ram to 1500mb by Roehsoft Ram Expander using frost kernel
link for frost kernel-
http://forum.xda-developers.com/galaxy-grand-duos/development/kernel-frost-beta-1-7-t2927449
:laugh: :good:

Hi,
Thank you very much for addressing the kernel for swap in i9082.
I was tired after wasted effort in search of this kind of stuff. This is working in i9082 with RR 5.1.1 lollipop.
Thanks again.

anyone know about ROMs or kernel that support swap for galaxy tab 2?

About SD Card Speed
I know this is a old thread but the user also asked about which SD card to use. I can't tell you which is best but I can give you the information so you can get what fits your needs. I too was confused about the markings on an SD card and did a bit of research. This is what I came up with:
Default bus speed 12.5MB Sec
High speed bus speed 25MB Sec
UHS-I (HC I, XC I) bus speed 50MB Sec
UHS-II (HC II, XC II) bus speed 312MB Sec
UHS-III (HC III, XC III) bus speed 624MB Sec
No speed markings minimum write <2MB Sec (Maybe SD Video)
Class 2 minimum write 2MB Sec (SD Video)
Class 4 minimum write 4MB Sec (SD, HD Video)
Class 6, V6 minimum write 6MB Sec (SD, HD Video)
Class 10, U1, V10 minimum write 10MB Sec (SD, HD, 4K Video)
U3, V30 minimum write 30MB Sec (HD, 4K Video)
V60 minimum write 60MB Sec (4K, 8k Video)
V90 minimum write 90MB Sec (8K Video)
32MB UHS-1, class 10, U1, V10 are approximately $15 (For a swap file nothing slower than this)
32MB UHS-2, U3, V30 are approximately $35 (For a swap file this is better)
32MB UHS-2, U3, V90 are approximately $75 (For a swap file this is best for under $100)