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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

issues with 32 & 64gb micro sd card

Hi! all. I intend to buy a Sandisk 32gb class 10 UHS1 rated microsd card. read on other tech forums that such UHS1 rated cards are having issues writing to the tablet regardless of formatting it to FAT32 or NTFS. only way of copying files is using a card reader instead of writing directly to the card via the tab or via the cable. is this true? Is there any thing i should look out for when i buy microsd card? some say that class 10 is not supported or not required. class 4 or class 6 is sufficient. Currently i'm using a 16gb microsd card & its working fine.

yes don't buy a class 10 card it will not work.
class 6 is fine.
Theres a big topic on these forums about it.

Zenin said:
yes don't buy a class 10 card it will not work.
class 6 is fine.
Theres a big topic on these forums about it.
Click to expand...
Click to collapse
Nonsense, I am using a 32Gb class 10 high speed memory card without ay problems. Even when copying 4Gb & larger blu ray movies onto the card it reads & plays without any problem...
Use a memory card reader when copying large files as it's far quicker than using a usb cable.

kanej2006 - have you had success with a class 10 64 gb card?
I was told the P6800 and the class 10 - 64 gb card did not work well. that is good news if it does work.

Recently, I had similar problems with a 64 GB class 6 sd card.

Both 32 & 64gb cards should work. Recently I bought a 32gb memory card and it wouldn't format.
It appeared faulty & I returned it. Once the new card arrived, I inserted it in the phone, formatted it & it's both reading and working just fine...
Unfortunately there are quite a large amount of faulty memory cards, try replacing the card or using an alternative brand...

i am using sandsk 64g sdxc class 10 formatted with ntfs. wanna share my experience
bad experience before: copy a 5g movie file via usb kies - one sdxc dead
current procedure: take out the card. copy big size files via sdxc card reader. so far so good.
i doubt the tf slot of p6800 originally supports sdhc only.

Proof a 32Gb class 10 card works.
Ps. You need an app such as Ntfs SD to mount the card so it will read. The program requires root access.
Screenshot:
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SD card problem

I can't get Google play music to play my music from my card reader worked on my Nexus 6p but can't get it to work on my pixel anyone got a idea why it wouldn't work?

I had trouble with a usb flash stick. My Pixel couldn't read the Fat32 partitioned stick wanted to format it to some Android format format, so I did. Then it wouldn't play the mp3s from my phone on my friend's amp that accepts Fat32.
You might have luck if you format the SD card with the Pixel then put the files back on it.
I had lots of issues with my Mac Pro connecting to Pixel as MTP or PTP. I hope for bug fixes and performance improvement in 7.1.1
:Alwayshopingforfixesandimprovement:
Sent from my sailfish using XDA Labs

I've just plugged a couple of FAT32 USB thumb driver into my Pixel via a USB C to USB 3.0 adaptor (which Choetech kindly sent me to review), and they worked absolutely fine. Wanted to format an NTFS formatted drive, but that was to be expected.

I'm trying to back up photos from my camera, and I can't get my 64gb SD card to work. It's formatted as exFAT since that is standard for SDXC cards. A smaller FAT32 SD card works most of the time if I tap the right settings after I plug it in.
I am using the included OTG dongle, and I tried a couple different SD card readers. All the combinations of cards and readers work on my computer.
I was able to get it to work using Solid Explorer and the Solid Explorer USB OTG Plugin, but the transfer speed was like 48kb/sec, and it was going to take 300 hours to back up the photos on my SD card at that rate. It's worth a try, and you can get a refund for the plugin if it's extremely slow for you too.

.. and here we see why many phone manufacturers are opt'n not to include removeable storage, even without an sd card, people have issues with their sd card.
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clockcycle said:
.. and here we see why many phone manufacturers are opt'n not to include removeable storage, even without an sd card, people have issues with their sd card.
Click to expand...
Click to collapse
There may be reasons not to have internal SD storage, like profit, performance, and maintaining control of the file structure. But that's not a good reason not to have external storage work. For example, many laptops now come with proprietary or soldered internal SSDs and no way to add internal storage. But you would definitely expect to be able to use SD cards with them, for example to get photos off your camera. It seemed to work most of the time for phones that had microSD slots, so there's no reason why it shouldn't work now.
Finally, when the iPad came out, being able to edit photos from your camera was a selling point. I would expect that to work on the latest Android phones 6 years later.