1.\" Copyright (c) 1996 2.\" Mike Pritchard <mpp@FreeBSD.org>. All rights reserved. 3.\" 4.\" Copyright (c) 1983, 1991, 1993 5.\" The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)mtio.4 8.1 (Berkeley) 6/5/93 36.\" $FreeBSD: src/share/man/man4/mtio.4,v 1.8.2.6 2001/08/17 13:08:38 ru Exp $ 37.\" 38.Dd March 5, 2005 39.Dt MTIO 4 40.Os 41.Sh NAME 42.Nm mtio 43.Nd magtape interface 44.Sh DESCRIPTION 45The special files 46named 47.Pa /dev/[nr]sa* 48refer to SCSI tape drives, 49which may be attached to the system. 50.Pa /dev/[nr]sa*.ctl 51are control devices that can be used to issue ioctls to the SCSI 52tape driver to set parameters that are required to last beyond the 53unmounting of a tape. 54.Pp 55The rewind devices automatically rewind 56when the last requested read, write or seek has finished, or the end of the tape 57has been reached. 58The letter 59.Ql n 60is usually prepended to 61the name of the no-rewind devices. 62.Pp 63Tapes can be written with either fixed length records or variable length 64records. See 65.Xr sa 4 66for more information. Two end-of-file markers mark the end of a tape, and 67one end-of-file marker marks the end of a tape file. 68If the tape is not to be rewound it is positioned with the 69head in between the two tape marks, where the next write 70will over write the second end-of-file marker. 71.Pp 72All of the magtape devices may be manipulated with the 73.Xr mt 1 74command. 75.Pp 76A number of 77.Xr ioctl 2 78operations are available 79on raw magnetic tape. 80Consult 81.In sys/mtio.h 82for further information. 83.Sh FILES 84.Bl -tag -width /dev/[nr]sa* -compact 85.It Pa /dev/[nr]sa* 86.El 87.Sh SEE ALSO 88.Xr mt 1 , 89.Xr tar 1 , 90.Xr sa 4 91.Sh HISTORY 92The 93.Nm 94manual appeared in 95.Bx 4.2 . 96An i386 version first appeared in 97.Fx 2.2 . 98.Sh BUGS 99The status should be returned in a device independent format. 100.Pp 101The special file naming should be redone in a consistent and understandable 102manner. 103