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Note:
Two additional bytes would be added for a hard-
sectored or removable drive (See Section 6.14).
After the MODE SELECT has been transferred to the controller and
good completion status has been sent to the host, the drive may
be formatted.
Step 2:
FORMAT UNIT
Interleave of 1:1
Fill data fields with E5H
1 defect at head 2, cylinder 11, 256 bytes from index
2 space sectors per cylinder
Hex
04
IE
E5
00
01
00
FORMAT UNIT command
Description
Op code (04 H for FORMAT UNIT command)
Lun0 and indicate fill character and defect
descriptor appended
Character to be filled in data fields
High byte of interleave (must be 00)
Low byte of interleave
Reserved
FORMAT UNIT Data Block
00
Format entire unit
02
Allocate 2 spare sectors per cylinder
00
High byte of length of defect list
08
Low byte of length of defect list
00
High byte of cylinder number of defect
00
Middle byte of cylinder number of defect
0B
Low byte of cylinder number of defect
02
Head number of defect
00
High byte of defect bytes from index
00
Middle byte of defect bytes from index
01
Middle byte of defect bytes from index
00
Low byte of defect bytes from index
The same procedure can be used for
formatting single cylinders.
Section 6.4.2 contains details on changes required to the FORMAT
UNIT command for cylinder level formatting.
The ACB-5500 allows you to select the desired interleave factor
with the FORMAT UNIT command.
The interleave can range from zero
to
the number
of blocks per
track,
minus 1.
The number
represents the number of physical blocks between consecutive
logical block numbers, thus an interleave of 1 means that the
sectors are consecutive.
500504-00
3-8
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