Lock count exceeded Valid eject request failed Undefined error occurred Write fault occurred Status register error Sense operation failed _DISK_RESET, _DISK_STATUS, _DISK_READ, _DISK_WRITE, _DISK_VARIFY, _DISK_FORMAT

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0x40

Seek operation failed

0x80

Attachment failed to respond

0xAA

Drive not ready (hard disk only)

0xB0

Volume not locked in drive (INT 13 extensions)

0xB1

Volume locked in drive (INT 13 extensions)

0xB2

Volume not removable (INT 13 extensions)

0xB3

Volume in use (INT 13 extensions)

0xB4

Lock count exceeded (INT 13 extensions)

0xB5

Valid eject request failed (INT 13 extensions)

0xBB

Undefined error occurred (hard disk only)

0xCC

Write fault occurred

0xE0

Status register error

0xFF

Sense operation failed

The table given next represents the operation commands to be performed by cmd parameter. First of all we shall see the common operations of both the functions.

biosdisk

_bios_disk

What it does

0

_DISK_RESET

Resets disk system, forcing the drive controller to do a hard reset. Ignore all other parameters

1

_DISK_STATUS

Returns the status of the last disk operation. Ignores all other parameters

2

_DISK_READ

Reads one or more disk sectors into memory

3

_DISK_WRITE

Writes one or more disk sectors from memory

4

_DISK_VERIFY

Verifies one or more sectors

5

_DISK_FORMAT

Formats a track

Though you are free to use either cmd = 0, 1, 2, 3, 4,5 or cmd = _DISK_RESET, _DISK_STATUS, _DISK_READ, _DISK_WRITE, _DISK_VARIFY, _DISK_FORMAT and both the options have the same effect, but it is recommended that you should have a habit to use words option such as cmd = _DISK_FORMAT instead of cmd = 5 because it may help you to avoid errors that may take place if you have typed a wrong command number for cmd.

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


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Number of Pages
ISBN
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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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