|Jefro I believe you are confused about the question. It would appear you were thinking ram usage not file system.|
File system is not OS dependent.
File system is not 32/64bit dependent
If fat32 you have x specs
If ntfs you have y specs.
Doesn't matter what OS accesses the file system it is the file system that sets the constraints not the OS.
The correct question to ask is what is the maximum volume size or what is the maximum file size.
A folder can grow to the size of the volume.
A file can grow to the size allowed under the file system
Example: almost 4gig file limit in Fat32. Ntfs file limit almost the size of the volume 2TB