[Windows 95 only.]
Verifies a track on the specified device.
mov bx, Drive ;See below
mov ch, DeviceCat ;See below
mov cl, 62h ;Verify track on logical drive
mov dx, seg VerifyBlock ;See below
mov ds, dx
mov dx, offset VerifyBlock ;ds:dx points to FVBLOCK structure
mov ax, 440Dh ;IOCTL for block device
int 21h
jc error_handler ;carry set means error
Value | Description |
---|---|
08h | FAT16 or FAT12 drive (Will fail on a FAT32 drive.) |
48h | FAT32, FAT16, or FAT12 drive. This value is supported on Windows 95 OEM Service Release 2 and later. |
Note: Because this call may be implemented in the device driver, the 48h form of this call may fail on FAT16 or FAT12 media. Therefore, applications making the 48h form of this call must fall back on the 08h form if the 48h call fails.
FVBLOCK STRUC
fvSpecFunc db 0 ;special functions
fvHead dw ? ;head to format/verify
fvCylinder dw ? ;cylinder to format/verify
fvTracks dw ? ;tracks to format/verify
FVBLOCK ENDS
The fvSpecFunc field can be 0 or 2.
If the function is successful, clears the carry flag. Otherwise, sets the carry flag and sets the AX register to one of the following error values.
Value | Name |
---|---|
0001h | ERROR_INVALID_FUNCTION |
0002h | ERROR_FILE_NOT_FOUND |
0005h | ERROR_ACCESS_DENIED |
Verify Track on Logical Drive returns 0002h (ERROR_FILE_NOT_FOUND) if the specified drive number is invalid.