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I was wondering what memory cards were compatible on this device.  I've been using a 32GB Micro SD card (SDHC) since I got it.  I recently ordered and received a 64GB memory card off Amazon (not from one of those shady traders) and I realized it was the wrong kind. (SDXC)
I've heard that certain users got 64 GB SDHC cards working after formatting to FAT32.  Is that legitimate?  If so, what brand(s) work(s)?  I'm really hoping for a larger memory solution.  I don't wanna have to lug around an external hard drive and have to keep it plugged into an outlet.

I was wondering what memory cards were compatible on this device.  I've been using a 32GB Micro SD card (SDHC) since I got it.  I recently ordered and received a 64GB memory card off Amazon (not from one of those shady traders) and I realized it was the wrong kind. (SDXC)
I've heard that certain users got 64 GB SDHC cards working after formatting to FAT32.  Is that legitimate?  If so, what brand(s) work(s)?  I'm really hoping for a larger memory solution.  I don't wanna have to lug around an external hard drive and have to keep it plugged into an outlet.

Pretty much
Its not really physical compatibly that's the problem its licensing Microsoft owns ex-fat that sdxc uses
Try one if it doesn't work try reformating to fat32

Only thing is there is a hidden section on SD cards that handle security some times this is lost when formatting that nullifies that function probably not an issue in most cases

I am using a scandisk 64gb sdxc class 10 UHS-1 and its working great. kinda expensive but I grabbed on sale for 100 bucks.

Im using that Sandisk card mentioned above. Seems to work just fine.

I haven't heard of a sdhc 64gb, I'm the manager of the local 'The Source' and all of our various skis for 64gb are xd.
You don't have to lug a power adapter. I hook up a flash drive to mine for movies and it works just fine. Haven't tried a 64gb, but my 32gb works.

I meant I'd have to provide power to an external hard drive if I were to use one.

Pretty much
Its not really physical compatibly that's the problem its licensing Microsoft owns ex-fat that sdxc uses
Try one if it doesn't work try reformating to fat32

Only thing is there is a hidden section on SD cards that handle security some times this is lost when formatting that nullifies that function probably not an issue in most cases

I've tried formatting using various programs, and none of them worked. (Including using command prompt.)

Strontium Nitro 64gb sdxc card. Insert sd card. Reboot into cw recovery. Mount sd card. Format card. Reboot. That worked for me. Hope that works for you.

I just tried that.  No luck with that. :/

You can get SanDisk Ultra 64 GB microSDXC on Amazon for $48.25
http://www.amazon.com/SanDisk-microSDXC-Memory-Adapter-SDSDQU-064G-AFFP-/dp/B009QZH6JS/ref=sr_1_1?s=electronics&ie=UTF8&qid=1388931798&sr=1-1&keywords=sandisk+64

That's actually the exact card I ordered.  Whenever I look to see if it's working in ES File Explorer, it says something along the lines of "No SD Mounted."

I'm using a Lexar 64GB MicroSDXC card, formatted at Fat32. The S7800 has no problem accessing the entire card either, so I'd say 64GB cards work just dandy with it.

Snagged mine for $40

How did you go about formatting it to FAT32?  That's my main issue.  I'm sure if I could actually get it to format, it would work just fine.

EDIT: I got it working.  I noticed the JXD said something about the memory card on the notification bar.  It asked if I wanted to format.  I did this several times, and it still didn't work.  So I went into recovery and did it there.  I ended up alternating between the two several times, but I finally got it.

Yeah, it's FAT32.  At least that's what Windows says.

Hi,

I also use a Sandisk 64gb sdxc UHS I card. It works fine, but sometimes my device loses connection to the storage. Only usb plug in to pc and reboots help.

Flash memory is pretty cheeap nowadays. i payd about 45? for my card and also bought 32gb for 15?!! in our supermarket.

Are you using the Supercharged firmware?  The SD is mounted as internal memory.  I haven't had problems with memory cards other than trying to get my 64 GB formatted correctly.

Could be like HDD mfg do
They'll count in units of 1000 instead of 1024
It adds up into gigabytes after a while
60gb sounds about right

64,000,000,000 bytes / 1024 / 1024 / 1024 = 59.6GB give or take

I've tried formatting using various programs, and none of them worked. (Including using command prompt.)

I suppose using GParted from a Linux machine (or a live-CD) would work.

What kind of games need 64G storage?