dtf(1) - Unix First Edition Manual Page
11/3/71DTF (I)

NAME dtf -- DECtape format
SYNOPSIS /etc/dtf
DESCRIPTION dtf will write timing tracks, mark tracks andblock numbers on a virgin DECtape. The format is

DEC standard of 578 blocks of 256 words each.The end zones are a little longer than standard DEC.

Before use, the tape to be formatted should be mounted ondrive 0. The `wall' and `wtm' switches should be enabled. After the tape is formatted, the switches should bedisabled to prevent damage to subsequent tapes due to a controller logic error.
SEE_ALSO sdate
DIAGNOSTICS "?" is typed for any error detected.
BUGS This program does physical I/O on drive 0. The processorpriority is set very high due to very stringent real time

requirements. This means that all time sharing activitiesare suspended during the formatting (about 1.5 minutes) The real time clock will also be slow.