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Android support micro SDXC (max 2TB) & FAT64 filesystem developement

Hi, I wan't to develop a new thing..
according to :
http://en.wikipedia.org/wiki/Microsd#Compatibility_issues_with_4.C2.A0GB_and_larger_cards
SDHC hosts which have drivers which recognize the newly used capability bits, and have operating system software which understands the exFAT filesystem, are compatible with SDXC cards.
currently (as Feb 2011), the Android doesn't have drivers to recognize exFAT (or FAT64), .... (or tell me if I'm wrong about this)
it's possible for us to insert SDXC card (more than 32GB) to the current SDHC host and recognize it.
but because my phone is Milestone (locked bootloader & signed kernel)
I can't test my own kernel directly to my phone. I need help other developers (who interested about this) to develop this thing ..if you wan't to contribute, then any previous work about propietary FAT64 file system is appreciated (sorry, must be open source)
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please join the development page @ http://code.google.com/p/android-sdxc-fat64/
P.S: sorry my english is bad, english isn't my native language

hello, anyone interested ?

I'd say try the question in this section: http://forum.xda-developers.com/forumdisplay.php?f=613
Sent from my Desire HD using XDA App

expanding on old ways
I don't know if this helps you but in older systems for phones you could fool the phones into thinking there where extra partitions to the cards, for example my palm centro capped out at 4 gig but i ran a 16 gig card inside it. I had to reformat the card from fat32 to fat16 or SDHC to Regularly SD and then was able to partition 4 gig spots, i had to partition becuase anything over the 4 gig limit would not be read. So i am curious to try a SDXC card in my fascinate and see where it gets me, but i have to wait till i get one of the cards. Otherwise it was a simple file mod and the card worked marvelously so if you have to partition 32gig sections that still a pretty large cap. Hope this helps you a little.

update: Apple has shipped new Mac with SDXC card slot
I estimate only take 4 - 7 month until HTC/Motorola will ship their new android phones with SDXC card slot

These cards are confirmed working in several Android's now:
http://www.androidnz.net/2011/09/sandisk-64gb-micro-sdxc-cards-confirmed.html

wow thanks, but it's new device
old devices still can't access newer microSD

Yeah if you want more then 4GB file size "exFat" currently not supported.
But you can still use SandDisk SDXC 64GB micro cards , just need to reformat them to fat32 , phone does it for you actually , talking from experience we had a long thread over at SGS2 forum section.
I have SGS2 and using Sandisc 64GB SDXC , upon insertion phone offered to format it as it did not recognize exFAT , after format it works just like any other SDCARD, max file size is <4GB under fat32.

See here: http://forum.xda-developers.com/showthread.php?t=1711310

the best micro sd for optimus?

Hi guys,i,m looking for a good micro sd 32 giga but they are very expensive,anyway which mark is the best? in ebay i can,t find some interesting offer.

lexar,mustang,sandisk...

Another question not really offtopic:
Are there a real performance gain between using a class 4 and a class 6 sdhc in a phone?
Sent from my LG-P920 using Tapatalk

i'm using a class 10 but, in a phone you can't notice any differences between class 10,6,4

I am using a class 4 32GB Sandisk.
Works fine with no problems.

Class 2 = 2mb per sec transfer rate
Class 4 = 4mb per sec transfer rate
Class 6 = 6mb per sec transfer rate
Class 10 = 10mb per sec transfer rate

Well I am using a class 4 micro sd card and bought a transcend one 32 gb for 38€ Works like a charm with out a problem. There is an app which speeds the sd card even up. Sd speed increase, search it in the market. Works great
Sent from my LG-P920 using XDA App

The thing about the class system is its a MINIMUM rating. So some class 2,4,6 cards will run as fast as a class 10, but they are only guaranteed to maintain their class rating speed.
Notice the speeds I get from the internal SD on the left, my PNY 16GB CLASS 10 on the right:
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Its not just BS either, I can actually achieve these speeds over USB Mass Storage mode. No more having to yank the card out and put it in a USB reader to get a decent speed, not with this phone.
It does beg the question though - how fast would modern phones be if they had decent SSDs inside instead of cheap FLASH chips? Like any computer the biggest cause of lag is waiting on IO so if they used better FLASH these things would really fly.

thanks for replays my friends
i,v got this one and hope to work fine. http://cgi.ebay.it/ws/eBayISAPI.dll?ViewItem&item=200623957615
Ok,today i,v recieved this micro sd (mustang 32 gig 10 class, i think it,s a very low quality
when I try to make videos, feel a slight click at the beginning that repeats itself after a few seconds, you think this problem depends on the memory card or phone?
any ideas?

[TEST]MicroSDHC Samsung 32gb VS sandisk 8gb(UPDATE!)

This will be test
between just bought Samsung microSDHC 32gb class10 VS Stock Sandisk microSDHC 8gb class4​
Test rules so the test would be as accurate as it can be:
Almost no backround programms where running on PC during this test
Both microSDHC cards where fully empty and formated with FAT32 filesystem
I'm an independent home consumer (so im not working for any company)
Things that was used in this test:
Apacer MegaSteno AM500 card reader
Original HTC Sensation Data Cable DC M410
HTC Sensation with android 4.0.3 and stock ROM
Windows 7 Ultimate 64bit SP1
SO LET'S GET STARTED!​
Some pics
[*] Both drive info
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[*] Now it's time for card speed test (card reader)
[*] Card speed test through phone and usb cable
[*] Copy test with card reader(1x .mkv movie file 1.49GB)
[*] Copy test with card reader(179x .jpg pic's with total size of 1.07GB)
[*] Copy test with USB cable(1x .mkv movie file 1.49GB)
[*]Copy test with USB cable(179x .jpg pic's with total size of 1.07GB)
----------- UPDATE -------------
[*] In phone test with Antutu benchmark tester
(Of course this is ment mainly for card test not the phone nor the score)
--------------------------------------------------------------------------
Now I hope my little test gave a little bit of Light from speed size...
I bought my Samsung card for about 30EUR(~37USD) @ one of my local internet stores and im freaki'n HAPPY with the speed!
At least when compared with my stock card what came with my device this new card is much much faster! and much much capacious!

This is really a comparison between class 10 and class 4. Seems you overpaid for 32GB as it can be had for $10-20.

your Samsung 32GB is only 29.2GB???? that sucks....my ADATA 32GB is 30.9GB

Is this a comparison of Price or Speed.
As we all know Class10 is faster than Class4.

Wow the Samsung looks really good, i read that class 10 cards had low 4K random R/W values but yours seems really fast on everything, sadly i couldnt find someone who sells them in my country so i bought an Adata 32GB uhs-i, no uhs in sensation so i got class 4 speeds, next i'll go Samsung for sure.

Amazing, well-written test. Thanks for your time.
Got my Samsung 32gb microSDHC card 2 weeks ago because
1. it was the cheapest 32gb class 10 card
2. it is from SAMSUNG
3. amazing writing speeds.
Very satisfied with it. I recomend it.

aznprodgy said:
your Samsung 32GB is only 29.2GB???? that sucks....my ADATA 32GB is 30.9GB
Click to expand...
Click to collapse
Depends on cluster size. Larger clusters = bit less space, but a bit more speed.
You can pick the size when you format in Windows.

This test was ment like comparison that stock card is pretty lame against new cards out thare and it is recomended to upgrade... and to see what does samsung card do against stock sandisk

[I9001][Q]Sandisk Ultra Class 10 microSDHC 32GB incompatible?

Hallo,
i've bought a Sandisk 32GB microSDHC and it doesn't run properly. It unmounts/vanishes after some seconds or crashes/freezes the whole OS (Android) if accessed. Same happens in CWM5/6. The card does work properly in Windows though (speed/reliable). Another Sandisk 16GB class4 works properly in the phone.
Anything known about incompatibilities regarding this card? Anyone using it without problems?
Sandisk Ultra Class 10 microSDHC 32GB
(SDSDQU-032G-U46A)
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I have the same card and it is perfect on my Galaxy S

Thanks.
Anyone else with explicit confirmation on S Plus (I9001)? Seems to have a different controller.

I think it's your rom (if not using stock) because i had same problem on some rom-s
Sent from my GT-I9000 using xda premium

Possible.. but i had this on CWM5/6 as well. Exactly the same issues. Just vanishes with i/o error. In the end a hotswap insert completely corrupted my system partitions (/system, /data at least). The card has been returned. Looks more like a UHS first generation bug or something to me. Maybe they run it out of specs on purpose to get better benchmarks. I don't know. At least I've found other people with same experiences on Google and Amazon that occur on that Sandisk cards.

Also got same card and works fine without any errors. Maybe the sdcard voltage is set too low in kernel or rom

I have the same card and works also perfect.
Running Stock Rom and no errors.
kind regards dekker

Have you tried formatting it with android under settings>storage?
Sent from my GT-I9000 using xda premium

If somebody have problems with SD Cards on Galaxy S than its Sandisk. I use Samsung SD Cards and have never any problems.

I got the same problems and after 3 months of usage the card died and I RMAed it. So be carefoul not to store any extremely valuable data.

sandisk ultra 32gb error on s4
i have galaxy s4 16gb with sandisk ultra microSD HC 32gb. after used a few hours my microSD card can't play video, can't open music or pictures thus can't delete the files. try to format it from options -> storage. it says blank sd card, but it's readable when i open it with windows7. try formatting from windows7 but the problems occured again after a few hours ( seems the problems occured when i tries to play large HD video clip, about 1920 x 1080 pxl video resolution ). is this error caused by sandisk or my galaxy s4 can't work with 32gb card ?

Problem is that Windows doesn't format SD cards properly, just good enough for its own purposes. Download the SD formatter from the SD consortium, and then do a full wipe. Your card now is really formatted as it should, and try again on your phone

Not necessary, I had similair issues as the OP and according to HD Tune my SD was heavely damaged..

query about memory card size

hi all,
i recently purchased infinix zero turbo 2023 , which has a micro sd card, the phone’s spec says it supports micro sd card upto 256 gb , i want to use 1tb micro sd card would that work, has anyone tried adding memory card higher than what the phone’s spec says , what has been your experience
thank you

Doesn't work: 256 GB is maximum.

I doubt you will find member that has tried, so just try yourself. check /proc/filesystems if exFAT is listed. as long as the phone supports the SDXC standard it may work up to 1 TB, as the address is within range.
0x3FFFFFFFFF = 256 GiB
0xFFFFFFFFFF = 1 TiB
the limitation is maybe just at time of writing the specs there wasn't simply such large SD cards on the market.
so it's tial & error.

pro9964 said:
hi all,
i recently purchased infinix zero turbo 2023 , which has a micro sd card, the phone’s spec says it supports micro sd card upto 256 gb , i want to use 1tb micro sd card would that work, has anyone tried adding memory card higher than what the phone’s spec says , what has been your experience
thank you
Click to expand...
Click to collapse
No you cant, you can just use sd cards which is 256gb or less in size also if you want more storage try cloud storage

I'm sure it would work fine! Might need to format it first in Android settings, I used to have a ps3 with a 2tb HDD (supposedly not supported at the time)
Never use cloud BTW store your data locally so its literally in your hands not some stranger.

pro9964 said:
hi all,
i recently purchased infinix zero turbo 2023 , which has a micro sd card, the phone’s spec says it supports micro sd card upto 256 gb , i want to use 1tb micro sd card would that work, has anyone tried adding memory card higher than what the phone’s spec says , what has been your experience
thank you
Click to expand...
Click to collapse
Incorrect: Phone supports microSDXC cards
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what basically allows you to format them as exFAT - a filesystem developed by Microsoft - and what can hold data up 2 TB.
Take note that it's up to OEM's discretion if they include exFAT driver in their kernel (and executables in userspace) after having an agreement with Microsoft or their partners. So check whether phone's Android can handle exFAT or not. AFAIK only some Samsung phones can.