Tape I/O
 
  These programs provide facility to do tape to tape processing of data,
provide recursive data archives and multi-volume processing under batch or
interactive control. In Unix the devices you will direct are in the /dev
directory.  There the st devices are for scsi interfaces like your 8mm
drives and the rst connotation denotes rewind upon completion, whereas
the nrst connotation denotes no rewind upon completion.  Furthermore, there
are drivers for low and high density access.  To write a tape in low density
use st0,st1,st2 ... st7 and to write in high density (add 8) use st8,st9,
st10 ... st15.  The tp devices are for 9-track access.  The connotation
rtp005 and rtp015 denote rewind upon completion while rtp004 and rtp014
do not rewind.  An example of a multi-volume tape to tape USP flow would be: 
 
		     xcram -r | editt -re1000 -R020 | xcram 
 
When this job is executed xcram will pop up a selection widget for read
and for write.  When the read encounters and EOF or an EOT the read widget
will reappear allowing you to chose another device for input. If one is
not required [you are finished] hit cancel.  When the write encounters an
EOT it will pop up the write widget asking for a device for output. It will
continue in this fashion until no further data is found on stdin at which
point the job will terminate. 
