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There are four different defect lists:
P-list.
The primary defect list: the list of defects found when the
drive is tested in the factory.
It is written on a system reserved
track and can never be modified by a user--it is preserved for the
life of the drive.
G-list.
The grown defect list: the list of accumulated defects
detected during field operation of the drive.
The defects are
detected either by the user, or by the read operation.
D-list.
The defect data list: the list of defective sectors provided
by the user to request the drive to map them out.
The D-list will be
merged into the G-list.
W-list.
The working list: the list of defective sectors and their
replacements.
The W-list is constructed from the defects combined
from the P-list, G-list, and D-list.
This list is used during
operation of the drive.
4.2.4
Updating the Drive Using the Defect Lists
At any time during normal operation, the user can choose to:
o
Map out the defective blocks.
The user can submit aD-list
of defects, and uses the REASSIGN BLOCKS command.
o
Rely on the Automatic Read Reallocation option of the MODE
SELECT command.
The drive automatically detects drive
idefects and reallocates the sectors.
o
Reformat the drive with the FORMAT UNIT command, using these
combinations of defect lists:
without defect lists
Factory defects only
Grown defects only
Existing defects
Provided defects only
Factory and provided defects
Grown and provided defects
All known defects
(use no defect lists)
(use P-list only)
(use G-list only)
(use P-list and G-list)
(use D-list only)
(use P-list and D-list)
(use G-list and D-list)
(use P-list, G-list, D-list)
In any of the above cases, the drive reconstructs the W-list and
updates the G-list.
The P-list, however, remains untouched.
See the Q200 Series Programmers Manual for details on use of the
commands and options mentioned.
4-9
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