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.