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.\" $DragonFly: src/share/man/man4/mtio.4,v 1.3 2005/03/05 16:10:39 hmp Exp $ 38.\" 39.Dd March 5, 2005 40.Dt MTIO 4 41.Os 42.Sh NAME 43.Nm mtio 44.Nd FreeBSD magtape interface 45.Sh DESCRIPTION 46The special files 47named 48.Pa /dev/[nr]sa* 49refer to SCSI tape drives, 50which may be attached to the system. 51.Pa /dev/[nr]sa*.ctl 52are control devices that can be used to issue ioctls to the SCSI 53tape driver to set parameters that are required to last beyond the 54unmounting of a tape. 55.Pp 56.Pp 57The rewind devices automatically rewind 58when the last requested read, write or seek has finished, or the end of the tape 59has been reached. 60The letter 61.Ql n 62is usually prepended to 63the name of the no-rewind devices. 64.Pp 65Tapes can be written with either fixed length records or variable length 66records. See 67.Xr sa 4 68for more information. Two end-of-file markers mark the end of a tape, and 69one end-of-file marker marks the end of a tape file. 70If the tape is not to be rewound it is positioned with the 71head in between the two tape marks, where the next write 72will over write the second end-of-file marker. 73.Pp 74All of the magtape devices may be manipulated with the 75.Xr mt 1 76command. 77.Pp 78A number of 79.Xr ioctl 2 80operations are available 81on raw magnetic tape. 82Consult 83.Aq Pa sys/mtio.h 84P 85for further information. 86.Sh FILES 87.Bl -tag -width /dev/[nr]sa* -compact 88.It Pa /dev/[nr]sa* 89.El 90.Sh SEE ALSO 91.Xr mt 1 , 92.Xr tar 1 , 93.Xr sa 4 94.Sh HISTORY 95The 96.Nm 97manual appeared in 98.Bx 4.2 . 99An i386 version first appeared in 100.Fx 2.2 . 101.Sh BUGS 102The status should be returned in a device independent format. 103.Pp 104The special file naming should be redone in a consistent and understandable 105manner. 106