Re: [gentoo-user] Memory cards and deleting files.

[antlists <antlists@youngman.org.uk>]

On 22/06/2020 11:56, Walter Dnes wrote:
> On Mon, Jun 22, 2020 at 11:28:17AM +0100, Neil Bothwick wrote
>
>> The SD standard says >33G should use exFAT, this is why many devices
>> state they only support cards up to 32G. The really mean they only
>> support FAT. My Dashcam is like this but it happily works with a 128G
>> card, once I reformatted it with FAT.
> Warning; that still does not change the fact that each individual file
> cannot exceed 4G in size on regular FAT.
>
Warning 2: I did exactly that, and it LOOKED like it was working 
happily, until it overflowed some internal limit and my 1G card turned 
into a 128M card or whatever it was. Have you actually TESTED that card 
IN THE DASHCAM and made sure it can actually use that 128G? Or will it 
only be able to use 4G of that card?

Oh - and 32GB cards are physically different from 128GB cards because 
they work to different standards. That's why so many of the old "real 
SD" card devices only ever use up to 2GB. You CAN (or could) get 4GB SD 
cards, but they were rare, so most people couldn't find them. The SD 
standard was replaced by SDHC, which is why your fileformat changes at 
32GB, which is the maximum capacity of an SDHC card. Above 32GB it's 
SDXC, which is another reason why sticking a larger card into a device 
which says "up to 32GB" is a bad idea - it may not be able to handle SDXC.

Cheers,
Wol