Arctic Pride
L Plate Member
Anyone encountered problems with 64 GB sandisk class 10? I had always run the 32gb cards but wanted some extra capacity and of course nothing but corruption errors while recording (this one)
. 2 different cards, 2 different cameras, same result. Formatted both cards on camera and on windows no diff.
I did some poking around the interwebs and cam up with a couple interesting pieces of info below..any thoughts?
For now I'm sticking with the 32gb cards, no issues
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I've posted in as many places as I can find: GoPro admits that it has issues with the exFAT file system on 64Gb and the cards end up destroyed. Their suggested work around was to use 32Gb cards.
The issue with 64GB and exfat/fat32 is not with the gopro itself, but other OSes and how they handle 32bit numbers. 64GB is the absolute maximum number/size you can fit in unsigned 32bits, and fat 32 is, you guessed it: 32 bits based. There is a problem with this "unsigned" though...
32 bit allows 64billion values.
Unsigned means there are no negative ("negative-signed") numbers, thus allowing double the positive values: 0G to +64G, in some coding, numbers are generally signed by default and a signed 32bit number has a range of -32G to +32G. 32GB is the safest for all OSes due to this. So OSes have flowed drivers using signed 32bit values and cannot properly address/use an entire 64GB (or any >32GB) fat32 filesystem.
. 2 different cards, 2 different cameras, same result. Formatted both cards on camera and on windows no diff.
I did some poking around the interwebs and cam up with a couple interesting pieces of info below..any thoughts?
For now I'm sticking with the 32gb cards, no issues
________________________________________________________________________________________
I've posted in as many places as I can find: GoPro admits that it has issues with the exFAT file system on 64Gb and the cards end up destroyed. Their suggested work around was to use 32Gb cards.
The issue with 64GB and exfat/fat32 is not with the gopro itself, but other OSes and how they handle 32bit numbers. 64GB is the absolute maximum number/size you can fit in unsigned 32bits, and fat 32 is, you guessed it: 32 bits based. There is a problem with this "unsigned" though...
32 bit allows 64billion values.
Unsigned means there are no negative ("negative-signed") numbers, thus allowing double the positive values: 0G to +64G, in some coding, numbers are generally signed by default and a signed 32bit number has a range of -32G to +32G. 32GB is the safest for all OSes due to this. So OSes have flowed drivers using signed 32bit values and cannot properly address/use an entire 64GB (or any >32GB) fat32 filesystem.
