[ros-dev] Partition size and FAT32 cluster size?

[João Jerónimo]

On 07-12-2014 10:07, Thomas Mueller wrote:
> What is the biggest partition size compatible with 4096-byte (4 KB) cluster size, cluster size being the minimum amount of space taken by a file however small?
>
> I googled some years ago and found it to be about 8 GB, however now I wonder if that was wrong, and I can accommodate a bigger partition.
I'm not sure, but..... in FAT32, there are 28 bits to address the 
cluster number. (But FAT entries are 32-bit aligned.)
So...
4*1024*(2**28)  = 1TB
So the maximum size of the filesystem with 4KB clusters is about 1TB; I 
say "about" because there are some reserved cluster numbers...
It is possible that my math is bogus. :-)

> I believe the best file system ReactOS can use so far is FAT32, true also for FreeDOS.
Off-topic: One can write file-system drivers for DOS, using the 
REDIRECTOR feature...

JJ