> FFS is 64bit and has been for a long time.

Well, sort of.  it can handle files larger than 2^32 bytes, but it's
not fully 64-bit.  

FFS still uses 32-bit block pointers, which causes it to max out at a
filesystem size of 2^41 or so.

Commodity disks now exceed 2^37 bytes.  We've got less than 4 bits of
headroom.

					- Bill