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Format of parameter block for function 42h

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Offset Size Description

00h

BYTE

reserved, must be zero (DOS <3.2):
bit 0 :
0 = format/verify track
1 = format status call (DOS 3.2+), don't actually format
bit 1 : format multiple tracks, require additional WORD (hard disks only)
bits 2-7 : reserved, must be zero

value on return (DOS 3.3+):
00h = specified tracks, sectors/track supported by BIOS
01h = function not supported by BIOS
02h = specified tracks, sectors/track not allowed for drive
03h = no disk in drive

01h

WORD

number of disk head

03h

WORD

number of disk cylinder

---BYTE 00h bit 1 set---

05h

WORD

number of tracks to format