For SCSI 1/4-inch cartridge and 1/2-inch front-loaded reel drives, substitute the density from Table 38-5for the A variable in the device name (/dev/rmt/XA).
Table 38-5 Designating Format or Density for SCSI Tape Drives
Character |
Density 1/4-Inch Cartridge |
Density 1/2-Inch Front-Loaded Reel-to-Reel |
---|---|---|
null |
Default preferred (highest) density |
Default preferred (highest) density |
l |
QIC-11 format |
800 bpi |
m |
QIC-24 format |
1600 bpi |
h |
QIC-150 |
6250 bpi |
u |
Reserved |
Reserved |
For 1/4-inch cartridges, density is specified by the format in which the data is written: the QIC format. The QIC-11 and QIC-24 format write approximately 1000 bytes per inch on each track. The density for QIC-150 is somewhat higher. The "preferred" density for a 60-Mbyte 1/4-inch cartridge drive is QIC-24 and for a 150-Mbyte 1/4-inch cartridge drive is QIC-150.
An 18-track drive can write only QIC-150; it cannot be switched to write QIC-24 or QIC-11. Format selection is only useful for drives that can write both QIC-24 and QIC-11.