IBM IC35L036UWDY10 Hard Drive Specifications - Page 102

Enable Changing of Retry Count of one enable Read Retry Count and Write Retry Count

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ARHES of zero indicates the drive will not perform ARHES operation. ARRE and AWRE (Mode Page 1) do not affect ARHES operation and ARHES works independently. ! ASDPE (Additional Save Data Pointer Enable) is used to control the sending of additional save data pointers messages. When it is set to one, it will cause a SAVE DATA POINTER message to be sent on every disconnection. This bit is only used by the drive after the Default Mode parameter values are overridden with the Saved values which are read from the reserved area of the media as a part of the motor startup sequence. Before the Saved values are read from the reserved area of the media, the SAVE DATA POINTER message is always sent to the Initiator prior to disconnection. When ASDPE is set to zero, a SAVE DATA POINTER message is sent only if the current connection contained a data phase and a further data phase will be required to complete the command. ! CMDAC (Command Active) works in conjunction with LED Mode. See LED Mode. ! RRNDE (Report Recovered Non Data Errors) controls the reporting of recovered non data errors (write soft errors) when PER (Mode Page 1) bit is set to one. If RRNDE is set to one, recovered non data errors are reported. If RRNDE bit is set to zero, recovered non data errors are not reported. ! CPE (Concurrent Processing Enable) is ignored. ! FDD (Format Degraded Disable) of one prevents the drive from reporting Format Degraded. An FDD of zero indicates that Format Degraded is reported for the TEST UNIT READY command and causes media access commands such as READ to report a media error if degraded. ! CAEN (Command Aging Enabled) of one causes the Command Aging Limit timer to be used to avoid commands waiting in the command queue for an indefinite period. When commands have been in the queue for a period of time greater than Command Aging Limit, they will be reordered to be executed on a first come first served basis. When CAEN is set to zero, commands are always executed based on the queue reordering rules. ! IGRA (Ignore Reassigned LBA) of one prevents the drive from processing reassigned LBA when RC (Mode Page 1) is set to one. The main purpose of IGRA is to avoid undesirable delay in read operation due to reassigned LBA for Audio Visual application. IGRA of zero enables the drive to process reassigned LBA even if RC (Mode Page 1) is to one. ! AVERP (AV ERP Mode) determines if Recovery Time Limit (RTL, Mode Page 1 and 7) is a command timer (AVERP is one) or an ERP timer (AVERP is zero). When AVERP is set to one, the RTL timer starts when a command is picked up from the command queue, and the timer is running until the command completion or time out. For compatibility with earlier products, when AVERP is set to one, Read Retry Count and Write Retry Count (Mode Page 1) specify the maximum retry counts for ERP regardless of ECRC. When AVERP is set to zero, the RTL timer runs only during ERP. ! ECRC (Enable Changing of Retry Count) of one enable Read Retry Count and Write Retry Count (Mode Page 1) as the maximum retry counts for ERP. ECRC of zero specifies that the drive performs all ERP steps when Read Retry Count and Write Retry Count are set to a non-zero value. ! ADC (Adaptive Cache Enable is ignored. ! HADR (Hide ADR) of one hides G-List entries by Auto Defect Reallocation (ADR) from READ DEFECT DATA. ! LED Mode controls the behavior of LED. There are 4 types of LED behavior. Motor Active: LED is turned on when spindle motor is running. Command Active: LED is turned on a command is under process or in the queue. Degraded Mode: LED stays on when the drive enters the Degraded Mode. Command Active/Degraded Mode: LED is turned on for both cases. Ultrastar 146Z10 hard disk drive specifications 86

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ARHES of zero indicates the drive will not perform ARHES operation.
ARRE and AWRE (Mode
Page 1) do not affect ARHES operation and ARHES works independently.
!
ASDPE
(Additional Save Data Pointer Enable) is used to control the sending of additional save data
pointers messages. When it is set to one, it will cause a SAVE DATA POINTER message to be sent
on every disconnection. This bit is only used by the drive after the Default Mode parameter values are
overridden with the Saved values which are read from the reserved area of the media as a part of the
motor startup sequence. Before the Saved values are read from the reserved area of the media, the
SAVE DATA POINTER message is always sent to the Initiator prior to disconnection. When ASDPE is
set to zero, a SAVE DATA POINTER message is sent only if the current connection contained a data
phase and a further data phase will be required to complete the command.
!
CMDAC
(Command Active) works in conjunction with LED Mode. See LED Mode.
!
RRNDE
(Report Recovered Non Data Errors) controls the reporting of recovered non data errors
(write soft errors) when PER (Mode Page 1) bit is set to one.
If RRNDE is set to one, recovered non
data errors are reported. If RRNDE bit is set to zero, recovered non data errors are not reported.
!
CPE
(Concurrent Processing Enable) is ignored.
!
FDD
(Format Degraded Disable) of one prevents the drive from reporting Format Degraded. An FDD
of zero indicates that Format Degraded is reported for the TEST UNIT READY command and causes
media access commands such as READ to report a media error if degraded.
!
CAEN
(Command Aging Enabled) of one causes the Command Aging Limit timer to be used to avoid
commands waiting in the command queue for an indefinite period. When commands have been in the
queue for a period of time greater than Command Aging Limit, they will be reordered to be executed
on a first come first served basis. When CAEN is set to zero, commands are always executed based
on the queue reordering rules.
!
IGRA
(Ignore Reassigned LBA) of one prevents the drive from processing reassigned LBA when RC
(Mode Page 1) is set to one. The main purpose of IGRA is to avoid undesirable delay in read
operation due to reassigned LBA for Audio Visual application. IGRA of zero enables the drive to
process reassigned LBA even if RC (Mode Page 1) is to one.
!
AVERP
(AV ERP Mode) determines if Recovery Time Limit (RTL, Mode Page 1 and 7) is a command
timer (AVERP is one) or an ERP timer (AVERP is zero). When AVERP is set to one, the RTL timer
starts when a command is picked up from the command queue, and the timer is running until the com-
mand completion or time out. For compatibility with earlier products, when AVERP is set to one, Read
Retry Count and Write Retry Count (Mode Page 1) specify the maximum retry counts for ERP regard-
less of ECRC. When AVERP is set to zero, the RTL timer runs only during ERP.
!
ECRC
(Enable Changing of Retry Count) of one enable Read Retry Count and Write Retry Count
(Mode Page 1) as the maximum retry counts for ERP. ECRC of zero specifies that the drive performs
all ERP steps when Read Retry Count and Write Retry Count are set to a non-zero value.
!
ADC
(Adaptive Cache Enable is ignored.
!
HADR
(Hide ADR) of one hides G-List entries by Auto Defect Reallocation (ADR) from READ
DEFECT DATA.
!
LED Mode
controls the behavior of LED. There are 4 types of LED behavior.
Motor Active:
LED is turned on when spindle motor is running.
Command Active:
LED is turned on a command is under process or in the queue.
Degraded Mode:
LED stays on when the drive enters the Degraded Mode.
Command Active/Degraded Mode:
LED is turned on for both cases.
Ultrastar 146Z10 hard disk drive specifications
86