2.2 Disk Partitions

2.2.1 SunOS 4.1.X

The BSD and SunOS 4.1.X operating systems divide a disk into 8 partitions: a --> h, some of which may be zero. Partition c covers the entire disk. On the root disk partition a is for the boot files and root directory, b is for swap space - virtual memory space for process and information that can't be contained in main memory, and c is the entire disk. Disk space is allocated in terms of cylinders, tracks, and sectors/blocks.

An example of the partition table on a SunOS 4.1.X disk might be:

# format sd0

format> partition

partition> print Corresponding

Current partition table (original sd0): File System

partition a - starting cyl 0, # blocks 33120 (46/0/0) / - root

partition b - starting cyl 46, # blocks 125280 (174/0/0) swap

partition c - starting cyl 0, # blocks 828720 (1151/0/0) entire disk

partition d - starting cyl 220, # blocks 59760 (83/0/0) /var

partition e - starting cyl 0, # blocks 0 (0/0/0)

partition f - starting cyl 0, # blocks 0 (0/0/0)

partition g - starting cyl 303, # blocks 610560 (848/0/0) /usr

partition h - starting cyl 0, # blocks 0 (0/0/0)

Unix System Administration - 8 AUG 1996

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