User`s manual

.DSKCFIG
5-23
5
Attribute Word -- IOSATW and IOSEATW
IOSATW contains various flags that specify characteristics of the
media and drive, which are defined in the following table. All
unused bits must be set to 0. All IOSEATW bits are undefined and
should be set to 0.
Table 5-5. IOSPRM Fields (CFGA)
Label
Bit
Position
Description
IOSRECB 0 Operating system block size
IOSSPTB 4 Sectors per track
IOSHDSB 5 Number of heads
IOSTRKB 6 Number of cylinders
IOSILVB 7 Interleave factor
IOSSOFB 8 Spiral offset
IOSPSMB 9 Physical sector size
IOSSHDB 10 Starting head number
IOSPCOMB 12 Precompensation cylinder number
IOSSRB 14 Step rate code
IOSRWCCB 15 Reduced write current cylinder number and
ECC data burst length
Table 5-6. IOSEPRM Fields (CFGA)
Label
Bit
Position
Description
IOAGPB1 0 Gap byte 1
IOAGPB2 1 Gap byte 2
IOAGPB3 2 Gap byte 3
IOAGPB4 3 Gap byte 4
IOASSC 4 Spare sector count
IOARUNIT 5 Reserved area units
IOARVC1 6 Reserved count 1
IOARVC2 7 Reserved count 2