System Administration Guide
Chapter 3, Backing up filesystems

About block and volume sizes

About block and volume sizes

Block size
the size of each block (in bytes) written on the media. If the files to back up are small, set the block size to a smaller value. If you set the block size to a larger value, the access time is less efficient.

Volume size
the capacity of the media (in KB). For example, a cartridge tape might be capable of storing 60MB (60000KB), 150MB (150000KB), or 520MB (520000 KB).


WARNING: Do not change the default volume sizes for floppy drives.

Specify block and volume size in bytes.

See also: