Platform SDK: Win32 API |
Formats and verifies a track on the specified device.
mov bx, Drive ;See below mov ch, DeviceCat ;See below mov cl, 42h ;Format track on logical drive mov dx, seg FormatBlock ;See below mov ds, dx mov dx, offset FormatBlock ;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 FAT32 drives.) |
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 member can be 0, 1, or 2. The fvTracks member is ignored.
If the fvSpecFunc member in the FVBLOCK structure is 1, clears the carry flag and sets the fvSpecFunc member to one of the following values.
Value | Meaning |
---|---|
0 | ROM support for given format combination |
1 | No ROM support |
2 | Illegal format combination |
3 | No media present |
If the fvSpecFunc member is 0 and 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 |
Format Track on Logical Drive returns 0002h (ERROR_FILE_NOT_FOUND) if the specified drive number is invalid.