diskaddrpacket readabsolutesectors writeabsolutesectors getdrivegeometry

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The Data Types representing several parameters of the disk have the following meanings:

Data Type

Size in Bytes

Description

unsigned int size

2 Bytes

Size of Buffer

unsigned int flags

2 Bytes

Information Flags

unsigned long cyl

4 Bytes

Number of Physical Cylinders on Drive

unsigned long heads

4 Bytes

Number of Physical Heads on Drive

unsigned long spt

4 Bytes

Number of Physical Sectors Per Track

unsigned long sectors[2]

8 Bytes

Total Number of Sectors on Drive

unsigned int bps

2 Bytes

Bytes Per Sector

  • The structure diskaddrpacket is used by the functions readabsolutesectors and writeabsolutesectors. The format of disk address packet has been given in the following table:

Data Type

Size in Bytes

Description

char packetsize

1 Byte

Size of Packet, generally 10H

char reserved

1 Byte

Reserved (0)

int blockcount

2 Bytes

Number of Blocks to Transfer

char far *bufferaddress

4 Bytes

address to Transfer Buffer

unsigned long blocknumber[2]

4 Bytes

Starting Absolute Block Number

  • The getdrivegeometry function is used to get the parameters of specified Drive. The Function getdrivegeometry uses function number 0x48 of INT 13H Extensions.

The meaning of parameters has been described in the table given next:

Parameter

What it means

i.h.ah = 0x48

Function Number 0x48 of INT 13H Extensions

i.h.dl = drive

Drive Number

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

ds:si address to buffer for drive parameters as discussed earlier

s.ds = FP_SEG ( (void far*)&g )

ds:si address to buffer for drive parameters as discussed earlier

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


Publishers of the Book
Number of Pages
ISBN
Price of the Book


BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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