Displaying Partition Table Information (System Administration Guide: Devices and File Systems)

System Administration Guide: Devices and File Systems

Displaying Partition Table Information

The following is an example of a partition table from a 4.0-Gbyte disk with a VTOC label displayed from the format utility:

Total disk cylinders available: 8892 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders        Size            Blocks
  0       root    wm    1110 - 4687        1.61GB    (0/3578/0) 3381210
  1       swap    wu       0 - 1109      512.00MB    (0/1110/0) 1048950
  2     backup    wm       0 - 8891        4.01GB    (0/8892/0) 8402940
  3 unassigned    wm       0               0         (0/0/0)          0
  4 unassigned    wm       0               0         (0/0/0)          0
  5 unassigned    wm       0               0         (0/0/0)          0
  6 unassigned    wm       0               0         (0/0/0)          0
  7       home    wm    4688 - 8891        1.89GB    (0/4204/0) 3972780

The partition table displayed by the format utility contains the following information:

Column Name	Description
`Part`	Partition (or slice number). See Table 10–7 for a description of this column.
`Tag`	Partition tag. See Table 10–7 for a description of this column.
`Flags`	Partition flag. See Table 10–7 for a description of this column.
`Cylinders`	The starting and ending cylinder number for the slice.
`Size`	The slice size in Mbytes.
`Blocks`	The total number of cylinders and the total number of sectors per slice in the far right column.
First Sector	EFI – The starting block number.
Last Sector	EFI – The ending block number.

The following is an example of a EFI disk label displayed by using the prtvtoc command.

# prtvtoc /dev/rdsk/c4t1d0s0
* /dev/rdsk/c4t1d0s0 partition map
*
* Dimensions:
*     512 bytes/sector
* 2576941056 sectors
* 2576940989 accessible sectors
*
* Flags:
*   1: unmountable
*  10: read-only
*
*                           First     Sector    Last
* Partition  Tag  Flags     Sector     Count    Sector   Mount Directory
       0      2    00          34   629145600  629145633
       1      4    00   629145634   629145600 1258291233
       6      4    00  1258291234  1318633404 2576924637
       8     11    00  2576924638       16384 2576941021
* Flags:
*   1: unmountable
*  10: read-only
*

The prtvtoc command provides the following information:

Column Name	Description
`Dimensions`	This section describes the physical dimensions of the disk drive.
`Flags`	This section describes the flags listed in the partition table section. For a description of partition flags, see Table 10–7.
`Partition` (or Slice) Table	This section contains the following information:
`Partition`	Partition (or slice number). For a description of this column, see Table 10–7.
`Tag`	Partition tag. For a description of this column, see Table 10–7.
`Flags`	Partition flag. For a description of this column, see Table 10–7.
`First Sector`	The first sector of the slice.
`Sector Count`	The total number of sectors in the slice.
`Last Sector`	The last sector of the slice.
`Mount Directory`	The last mount point directory for the file system.