User`s guide

FORMAT
After it completes verification, RT–11 displays at the terminal each bad block it
found during each verification pass. The format of the verification report is:
PATTERN x
----------
nnnnnn
In the preceding example, x represents the pattern number, and nnnnnn
represents the bad-block number. RT–11 makes a separate verification pass for
each pattern it runs and reports on each pass.
The command line that follows verifies an RL02 disk with the 16-bit patterns
denoted by the value 25:
.FORMAT/VERIFY/PATTERN:25 DL0:
DL0:/FORMAT-Are you sure? Y
?FORMAT-I-Formatting complete
PATTERN 5
PATTERN 3
PATTERN 1
?FORMAT-I-Verification complete
If you do not supply a value with /PATTERN, RT–11 uses pattern 8.
/[NO]QUERY
/QUERY requests confirmation before it performs formatting or verification.
Respond to the query message by typing Y (or any string beginning with Y)
RETURN
to continue the operation. RT–11 interprets any other response to mean
NO; it does not perform the specified operation. /QUERY is the default setting.
/NOQUERY suppresses the confirmation message before it performs formatting
or verification. When you use this option in the FORMAT command line, RT–11
displays only the pattern numbers it uses (if it performs verification) and the
informational messages. The default setting is /QUERY.
/SINGLEDENSITY
Formats an RX02 double-density diskette in single-density format. The following
example uses the /SINGLEDENSITY option to format a diskette in RX02 drive
unit 1 as a single-density diskette:
.FORMAT/SINGLEDENSITY DY1:
DY1:/FORMAT-Are you sure? Y
?FORMAT-I-Formatting complete
/VERIFY[:ONLY]
/VERIFY (without the ONLY) formats and verifies that RT–11 can read from or
write to blocks on a disk or diskette. During the verification procedure, if RT–11
finds a bad block, it replaces that block.
Bad-block replacement is a technique in which substitute blocks are provided for
blocks that have caused a read or write error. The replacement blocks appear to
occupy the disk positions of the original blocks, and the disk appears to contain
only good blocks.
128 RT–11 Command Descriptions