You can copy files to and from tape devices in the same way as you
do with floppy disks. However, there are a number of differences
between tapes and floppy disk systems. Notably, although magnetic
tapes can store far more data than a floppy disk, they can only
provide serial access to the information; that is, when
reading or writing a tape, you must start at the beginning and read
through each file until you get to the end: you cannot jump around
or skip files.
To copy files to and from a tape device, you should use
tar or cpio, with the appropriate device file
(from the list below). You may also need to use the tape
command to control the tape drive directly; see
``Rewinding, erasing, and retensioning tapes''.
There are several different types of tape that may be available on
your machine. The following are the most common:
A full-sized quarter-inch tape cartridge; the first QIC-02
drive uses the /dev/rct0 device file. After accessing the
tape, this device automatically rewinds the tape. If you store more
than one archive on the tape, you must use the no-rewind device file
/dev/nrct0 to access the second and subsequent files.
Smaller mini-cartridge units related to the QIC-02
format. These devices are accessed through the /dev/ft0
Mini-cartridge tape drives linked to the floppy disk drive
controller. These differ significantly from the QIC family
of tape drives. Notably, you must format mini-cartridge tapes before
using them (see
Mini-cartridge drives are accessed via the /dev/ctmini
SCSI tape drives are controlled by a SCSI
controller; they are accessed via the devices named
/dev/Stp0, /dev/Stp1, and so on.
Determining how many disks you need for a backup
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003