FatFs - f_fdisk

## f_fdisk

The f_fdisk fucntion divides a physical drive.

    FRESULT f_fdisk (
      BYTE  pdrv,        /* [IN] Physical drive number */
      const DWORD* szt,  /* [IN] Partition map table */
      void* work         /* [IN] Work area */
    );

#### Parameters

pdrv
  Specifies the physical drive to be divided. This is not the logical drive number but the drive identifier passed to the low level disk functions.
szt
  Pointer to the first item of the partition map table.
work
  Pointer to the function work area. The size must be at least `_MAX_SS` bytes.

#### Return Values

FR_OK, FR_DISK_ERR, FR_NOT_READY, FR_WRITE_PROTECTED, FR_INVALID_PARAMETER

#### Description

The `f_fdisk` function creates partitions on the physical drive. The partitioning format is in generic FDISK format, so that it can create upto four primary partitions. Logical volumes in the extended partition is not supported. The partition map table with four items specifies how to divide the physical drive. The first item specifies the size of first primary partition and fourth item specifies the fourth primary partition. If the value is less than or equal to 100, it specifies the partition size in percentage of the entire drive space. If it is larger than 100, it specifies the partition size in unit of sector. The partitions are located on the drive in order of from first item.

#### QuickInfo

Available when `_FS_READOLNY == 0`, `_USE_MKFS == 1` and `_MULTI_PARTITION == 1`.

#### Example

        /* Volume management table defined by user (required when _MULTI_PARTITION == 1) */

        PARTITION VolToPart[] = {
            {0, 1},    /* "0:" ==> Physical drive 0, 1st partition */
            {0, 2},    /* "1:" ==> Physical drive 0, 2nd partition */
            {1, 0}     /* "2:" ==> Physical drive 1, auto detection */
        };

        /* Initialize a brand-new disk drive mapped to physical drive 0 */

        DWORD plist[] = {50, 50, 0, 0};  /* Divide drive into two partitions */
        BYTE work[_MAX_SS];

        f_fdisk(0, plist, work);                    /* Divide physical drive 0 */

        f_mkfs("0:", FM_ANY, work, sizeof work);    /* Create FAT volume on the logical drive 0 */
        f_mkfs("1:", FM_ANY, work, sizeof work);    /* Create FAT volume on the logical drive 1 */

#### See Also

Volume management, `f_mkfs`

Return