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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.
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