1.\" $OpenBSD: mtio.4,v 1.15 2014/01/21 03:15:46 schwarze Exp $ 2.\" $NetBSD: mtio.4,v 1.4 1996/03/03 17:13:54 thorpej Exp $ 3.\" 4.\" Copyright (c) 1983, 1991 The Regents of the University of California. 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" from: @(#)mtio.4 6.5 (Berkeley) 3/27/91 32.\" 33.Dd $Mdocdate: January 21 2014 $ 34.Dt MTIO 4 35.Os 36.Sh NAME 37.Nm mtio 38.Nd magtape interface 39.Sh SYNOPSIS 40.Fd #include <sys/mtio.h> 41.Sh DESCRIPTION 42This interface concerns devices which are typical tape block devices, 43see 44.Xr physio 9 . 45.Pp 46The conventional device letters/numbers 47is applicable to any of the transport/controller pairs. 48(But note that only 1600 49.Tn BPI 50is available with the 51.Tn TS11 , 52and that 800 53.Tn BPI 54is not applicable to 55.Tn TM78 . ) 56.Pp 57When the device last number is between 58.Em 0-7 59the device will operate at 800 60.Tn BPI 61(or its lowest density), between 62.Em 8-15 63it will operate at 1600 64.Tn BPI 65(or its second density), and between 66.Em 16-23 67it will operate at 6250 68.Tn BPI . 69.Pp 70The rewind devices automatically rewind 71when the last requested read, write or seek has finished, or the end of the tape 72has been reached. 73The letter 74.Ql n 75is usually prepended to 76the name of the no-rewind devices. 77.Pp 78Unix tapes are written in multiples of 1024 byte block 79records. 80Two end-of-file markers mark the end of a tape, and 81one end-of-file marker marks the end of a tape file. 82If the tape is not to be rewound it is positioned with the 83head in between the two tape marks, where the next write 84will overwrite the second end-of-file marker. 85.Pp 86All of the magtape devices may be manipulated with the 87.Xr mt 1 88command. 89.Pp 90The include file 91.In sys/mtio.h 92defines the various 93.Xr ioctl 2 94operations available on raw magnetic tape. 95.Sh FILES 96.Bl -tag -width /dev/rmt? -compact 97.It Pa /dev/mt? 98.It Pa /dev/rmt? 99.El 100.Sh SEE ALSO 101.Xr mt 1 , 102.Xr tar 1 , 103.Xr intro 4 , 104.Xr st 4 105.Sh HISTORY 106The 107.Nm 108manual appeared in 109.Bx 4.2 . 110.Sh BUGS 111The status should be returned in a device independent format. 112