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Using TAR Devices (SCO UNIX and XENIX)


Century's diskettes are formatted in the following way:

3.5" disks are written with a block of 18 and a size of 720

5.25" disks are written with a block of 10 and a size of 2400

Cartridge tapes are usually written with a block of 20.

On SCO UNIX and XENIX, you can use the tar command to find out what your devices are configured as.

$ tar

Usage: tar -{txruc}[0-9vfbkelmnpwAF] [tapefile] [blocksize] [tapesize] files...

Key Device Block Size Tape
0 /dev/rfd048ds9 18 720 No
1 /dev/rfd148ds9 18 720 No
2 /dev/rfd096ds15 10 2400 No
3 /dev/rfd196ds15 10 2400 No
4 /dev/rfd096ds9 18 1440 No
5 /dev/rfd196ds9 18 1400 No
6 /dev/rfd0135ds18 18 2880 No
7 /dev/rfd1135ds18 18 2880 No
8 /dev/rct0 20 0 Yes
9 /dev/rctmini 20 0 Yes

The tar devices in the book are for a standard installation.
The following test can be used to determine what device name is needed for the tar command.

# for x in `ls /dev/rfd*`

NOTE: Use the tic character, not the single quote mark

> do
> echo "device: $x"
> tar xvf$x
> done
#

The "rfd" will need to be changed to the proper device name depending on the operating system.

INTERACTIVE UNIX SYS V/386: /dev/rdsk/*
SCO UNIX/XENIX: /dev/rfd*
SUN MICROSYSTEMS: /dev/rst*

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