MTIO(4)                   OpenBSD Programmer's Manual                  MTIO(4)

NAME
     mtio - magtape interface

SYNOPSIS
     #include <sys/mtio.h>

DESCRIPTION
     This interface concerns devices which are typical tape block devices, see
     physio(9).

     The conventional device letters/numbers is applicable to any of the
     transport/controller pairs.  (But note that only 1600 BPI is available
     with the TS11, and that 800 BPI is not applicable to TM78.)

     When the device last number is between 0-7 the device will operate at 800
     BPI (or its lowest density), between 8-15 it will operate at 1600 BPI (or
     its second density), and between 16-23 it will operate at 6250 BPI.

     The rewind devices automatically rewind when the last requested read,
     write or seek has finished, or the end of the tape has been reached.  The
     letter `n' is usually prepended to the name of the no-rewind devices.

     Unix tapes are written in multiples of 1024 byte block records.  Two end-
     of-file markers mark the end of a tape, and one end-of-file marker marks
     the end of a tape file.  If the tape is not to be rewound it is posi-
     tioned with the head in between the two tape marks, where the next write
     will overwrite the second end-of-file marker.

     All of the magtape devices may be manipulated with the mt(1) command.

     The include file <sys/mtio.h> defines the various ioctl(2) operations
     available on raw magnetic tape.

FILES
     /dev/mt?
     /dev/rmt?

SEE ALSO
     mt(1), tar(1), intro(4), st(4)

HISTORY
     The mtio manual appeared in 4.2BSD.

BUGS
     The status should be returned in a device independent format.

OpenBSD 4.7                      May 31, 2007                                1
