User`s guide

FORMAT
Options
/PATTERN[:value]
Used with /VERIFY[:ONLY], specifies which 16-bit patterns you want RT–11 to
use when it verifies the volume. The optional argument value represents an octal
integer in the range 0 to 177777 that denotes which patterns you want used.
The following table lists the verification patterns FORMAT uses and the
corresponding values for the argument value.
Verification Bit Patterns
Pattern Bit Set Value 16-Bit Pattern
1 0 1 000000
2 1 2 177777
3 2 4 163126
4 3 10 125252
5 4 20 052525
6 5 40 007417
7 6 100 021042
8 7 200 104210
9 8 400 155555
10 9 1000 145454
11 10 2000 146314
12 11 4000 162745
13 12 10000 *
14 13 20000 *
15 14 40000 *
16 15 100000 *
*These patterns are reserved for future use. Currently these bit patterns run
the default bit pattern (pattern 8).
In /PATTERN:value, the number you specify for value indicates which bit
patterns to run during verification. The preceding table gives the equivalent
values for each verification bit pattern. To run more than one bit pattern, add
together the values for each pattern you select. For example, suppose you want
to run bit patterns 1, 3, and 5. The corresponding values are 1, 4, and 20, for
a sum of 25. This is the value you would specify with /PATTERN to run all
three bit patterns. If you specify /PATTERN:777, patterns 1 through 9 are run
during verification. If you do not use the /PATTERN:value option, RT–11 runs
only pattern 8.
RT–11 Command Descriptions 127