This interface concerns devices which are typical tape block devices, see
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
device will operate at 800 BPI (or its lowest density), between
it will operate at 1600 BPI (or its second
density), and between 16-23
it will operate at
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
’ 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 positioned with the head in
between the two tape marks, where the next write will overwrite the second
All of the magtape devices may be manipulated with the
The include file
defines the various ioctl(2)
operations available on raw magnetic tape.
manual appeared in
The status should be returned in a device independent format.