Please explain functionality of DPRY bit in FORMAT UNIT paraemeter data
gerry.houlder at seagate.com
Thu Sep 22 06:41:09 PDT 2011
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DPRY represents "Disable PRimarY defect list". If set to one, then the
device shall not add the primary defect list to the list of defects that
will be reallocated during that FORMAT operation. If set to zero, then the
device shall include the primary defect list in the list of defects that
will be reallocated during that FORMAT operation.
The primary defect list should only be disabled for test purposes, when you
want the device to contain unrecoverable read errors.
On Thu, Sep 22, 2011 at 12:40 AM, rajasekhar kurapati <
rajasekharmsc at gmail.com> wrote:
> Dear T10 members,
> This query is related to DPRY bit in the parameter data of the FORMAT UNIT
> If DPRY bit set to 1 then device server shall not use PLIST while
> formatting the drive to find the defects, so it will not delete the PLIST.
> Please explain the functionality of DPRY bit set to zero in the Parameter
> data of FORMAT UNIT command.
> Does device server will use the defects in PLIST while formatting the drive
> when DPRY = 0?
> If it uses the PLIST will it remove the PLIST?
> If the device server can't delete PLIST in both the cases DPRY = 0 and DPRY
> = 1 then pelase explain the significance of the DPRY bit
> *Description in the spec r27 Section 18.104.22.168*
> A disable primary (DPRY) bit set to zero specifies that the device server
> shall not use parts of the medium
> identified as defective in the PLIST for application client accessible
> logical blocks. If the device server is not able to locate the PLIST or it
> is not able to determine whether a PLIST exists, then the device server
> shall take the action specified by the STPF bit.
> A DPRY bit set to one specifies that the device server shall not use the
> PLIST to identify defective areas of the medium. The PLIST shall not be
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