MEDIA(5) — FILE FORMATS

NAME

media − tape media description database

SYNOPSIS

/etc/media

DESCRIPTION

The /etc/media file contains entries for various types of tape media. This file is used by utilities such as dump(8) , and restore(8) that require information about the the tape media.

Each entry consists of a line of the form:

media density passes length irg error ntrec xtate

media is the name given to the media. This field is used as the key during searches of the database.

density is the number of bytes per inch per pass of the tape. For example, a 1/2" nine-track tape requires a single pass to fill the tape. If recorded at 1600 bytes-per-inch the density is 1600.

passes is the number of passes over the media required to fill the media. For example, a QIC-150 cartridge will perform 18 passes over the tape since it uses serial recording with 18 tracks.

length is the length of the tape in feet (’) or inches (").

irg is the length of the inner record gap in 1/10 inches. This figure refers to the maximum amount of tape which is wasted between blocks.

error is the percentage of tape which may be defective.

ntrec is the number of 1K blocks per record on the tape; used by dump(8) and restore(8) to determine the blocking factor.

xrate is the average transfer rate to the media.

A pound-sign (#) as the first non-white character indicates a comment line which is ignored by routines that read this file.

EXAMPLES

The following example is for a 2400’ 1/2" tape at GCR density.

GCR 6250 1 2400’ 6 5 32 500

FILES