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Format of parameter block for functions 41h, 61h

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Offset Size Description

00h

BYTE

special functions (reserved, must be zero)

01h

WORD

number of disk head

03h

WORD

number of disk cylinder

05h

WORD

number of first sector to read/write

07h

WORD

number of sectors

09h

DWORD

transfer address

Note:

Under Windows95, a volume must be locked (see AX=440Dh/CX=084Bh) in order to perform direct accesses such as track reads and writes with this IOCTL function.