An important part of the disk label is the partition table which identifies a disk's slices, the slice boundaries (in cylinders), and total size of the slices. A disk's partition table can be displayed using the format utility. Table 21-7 describes partition table terminology.
Table 21-7 Partition Table Terminology
Partition flags and tags are assigned by convention and require no maintenance.
See "How to Display Disk Slice Information" or "How to Examine a Disk Label" for more information on displaying the partition table.
The following partition table example is displayed from a 535-Mbyte disk using the format utility:
The partition table contains the following information:
Column Name |
Description |
Part |
Partition (or slice number). See Table 21-7 for a description of this column. |
Tag |
Partition tag. See Table 21-7 for a description of this column. |
Flags |
Partition flag. See Table 21-7 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. |
The following example displays a disk label using the prtvtoc command.
# prtvtoc /dev/rdsk/c0t3d0s0 * /dev/rdsk/c0t3d0s0 partition map * * Dimensions: * 512 bytes/sector * 80 sectors/track * 9 tracks/cylinder * 720 sectors/cylinder * 2500 cylinders * 1151 accessible cylinders * * Flags: * 1: unmountable * 10: read-only * * First Sector Last * Partition Tag Flags Sector Count Sector Mount Directory 0 2 00 0 66240 66239 / 1 3 01 66240 131760 197999 2 5 00 0 828720 828719 3 0 00 198000 66240 264239 /export 4 0 00 264240 66240 330479 /export/swap 5 0 00 330480 72000 402479 /opt 6 4 00 402480 385200 787679 /usr 7 8 00 787680 41040 828719 /export/home # |
The disk label includes the following information:
Dimensions - This section describes the physical dimensions of the disk drive.
Flags - This section describes the flags listed in the partition table section. See Table 21-7 for a description of partition flags.
Partition (or Slice) Table - This section contains the following information:
Column Name |
Description |
Partion |
Partition (or slice number). See Table 21-7 for a description of this column. |
Tag |
Partition tag. See Table 21-7 for a description of this column. |
Flags |
Partition flag. See Table 21-7 for a description of this column. |
First Sector |
The first sector of the slice. |
Sector Count |
The total number of sectors in the slice. |
Last Sector |
The last sector number in the slice. |
Mount Directory |
The last mount point directory for the file system. |