>BTW, what needed in BIOS (which INT 13 functions?) for support big
  >drives in MS-DOS7 and FreeDOS?

  define "Big Disks" please

  only thing I understand as big disk is 48bit Logical Block Adressing
(LBA-48) instead of 28bit LBA (128GB). LBA-48 was introduced and included in
the standard of UDMA133, and backported for some UDMA100 controllers.
  FAT32 support would be required, I guess, for DOS.
  no use in splitting up a 300GB harddisk in 2GB pieces for FAT16 :(
  can't help you with the INT13 stuff. not a programmer.

  Bernd



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