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.

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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

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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)