Manage Primary
Manage
Primary
The MANAGE PRIMARY command is used
to
manage the Primary Defect list (Plist). The
command has three options:
delete the current Plist, append defects
to
the
current Plist,
or replace the current Plist with a new Plist. When appending or replacing the Plist, this
command causes the specified physical blocks
to
be reassigned as primary defects and added
to
the Plist.
The delete and replace options are implemented by performing a full device format, which will
cause the loss of all user
data
and log information. Any data residing on
the
media before
these options
are implemented will be lost. Any existing Grown Defect List (Glist) defect
information will also be lost. The current operating MODE
SELECT parameters will become
the saved parameters following this command.
The append option will only update the list of
Plist entries. The media will not be
reinitialized, but the mapping to user
data
will be altered such
that
data
resident on the
media prior to the append operation will be lost.
The operation of the MANAGE
PRIMARY command is similar
to
the FORMAT UNIT
command.
Caution
,
The MANAGE PRIMARY command
allows
the Target to overwrite any or all
of the Initiator-addressable
data
space. This command should be performed
only when no
data
retention is required.
Use
of this command should be restricted to development or other
highly controlled environments. Any use of this command other
than
at
Hewlett-Packard approved sites may be deemed a violation of warranty.
There are three possible sources of defect location information during execution of the
MANAGE
PRIMARY command:
Plist (Primary Defect List). The list of permanent defects supplied by
the
original
manufacturer. The
Plist is located outside of the Initiator-accessible logical block space. The
Plist is accessible by the Target (to ·reference while formatting); but-is not normally accessible
by the Initiator except through the READ DEFECT command.
Dlist
(Data
Defect List). Supplied by the Initiator in the
Data
Out phase of the MANAGE
PRIMARY command.
Glist (Grown
Defect List.) Maintained by the Target and includes all defects sent
to
the
Target from the Initiator (the Dlist), any defects identified by the Target during previous
and current MANAGE
PRIMARY operations, and any defects identified by a REASSIGN
BLOCKS
command. The Glist does NOT include the Plist. Any execution of
the
MANAGE
PRIMARY command will delete the current Glist (if present).
DRAFT
Vendor Unique Command Descriptions 8·11
1/18/93 09:58
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