Absolute Sector(s) segment register values

Parameter

Size in Bytes

Description

pp.packetsize = 16 ;

1 Byte

Size of packet = 10H

pp.reserved = 0 ;

1 Byte

Reserved = 0

pp.blockcount = numofsectors ;

2 Bytes

Number of sectors to read

pp.bufferaddress = (char far*)
MK_FP ( FP_SEG((void far*)buffer), FP_OFF((void far*)buffer));

-----

for Data buffer or Transfer Buffer

pp.blocknumber[0] = sectornumber ;

4 Bytes

Sector number to read/write (generally, we need only this). Only alone This can support up to 2.1 Terabytes.

pp.blocknumber[1] = 0 ;

4 Bytes

Block number.
Use this, If accessing the disk of greater then 2.1 Terabytes in size.

i.h.ah = 0x42 ; or i.h.ah = 0x43 ;

2 Bytes

Function Number of INT 13H Extensions

i.h.al = 0x00 ;

1 Byte

Write Flags used in write function only,
00H, 01H are used for Write Without Verify and 02H is used for write with verify

i.h.dl = drive ;

2 Bytes

Physical Drive Number

i.x.si = FP_OFF ( (void far*)&pp ) ;

------

ds:si for buffer Parameters

s.ds = FP_SEG ( (void far*)&pp ) ;

------

ds:si for buffer Parameters

int86x ( 0x13, &i, &o, &s ) ;

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Invoke the specified Function of INT 13H with segment register values