Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
112
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RRNDE
(Report Recovered Non Data Errors) bit controls the reporting of recovered Non Data Errors when the PER bit
is set. If RRNDE is set, recovered Non Data Errors are reported. If the RRNDE bit is not set, then recovered Non
Data Errors are not reported.
•
FDD (
Format Degraded Disable) controls the reporting of Format Degraded sense data for Test Unit Ready commands
when the drive is in a format degraded state. When the FDD bit is one, Format Degraded sense data will not be
reported for a Test Unit Ready command. When the FDD bit is zero, Format Degraded sense data will be reported
for Test Unit Ready commands when the drive is in a format degraded state. This bit does not affect the reporting of
Format Degraded conditions for any media access commands.
•
DPSDP
The Data Phase Save Data Pointer bit controls whether the Drive sends a Save Data Pointer message at the end
of the data phase. A DPSDP bit of 0 indicates that the Drive sends a Save Data Pointer message prior to disconnec-
tion only if the following conditions are true:
- A data phase has occurred since the connection for the current command was established.
- Another data phase is required to successfully complete the command.
A DPSDP bit of 1 indicates that the Drive will send a Save Data Pointer message prior to every disconnection once a
data phase has occurred for the current command. If the ASDPE bit is set to 1, the Save Data Pointer message is sent
prior to every disconnect regardless of the value of the DPSDP bit.
•
CAEN
(Command Aging Enable)
When set this bit causes the Command Age 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 the timer limit they will be reordered to be executed on a first come first served basis. When this bit is
reset, commands are always executed based on the queue reordering rules.
•
IGRA
(Ignore Reassigned LBA) bit is set to 1 for preventing the drive from reassigned processing against reassigned
LBA when RC bit (Mode Page 1 byte 2 bit 4) is active. The main purpose of this bit is to avoid undesirable read pro-
cessing time delay due to reassigned LBA processing for continuous data availability requirements such as Audio
Visual application. IGRA bit set to 0 specifies that the drive shall process reassigned LBA even if RC bit is active.
•
AVERP
(AV ERP Mode) bit is set to one in order to specify maximum retry counts during Read DRP. When AVERPbit
is set to one, the maximum retry counts for read operations is specified by Read Retry Count (Mode Page 1 Byte 3).
AVERP bit is set to zero to specify that the drive shall process read DRP up to the default maximum retry count when
Read Retry Count is set to a non-zero value.
•
OCT
(Overall Command Timer) controls the maximum command execution time, from receipt by the drive until status
is returned. If the command is unable to complete in the specified amount of time, it will be aborted with Check Con-
dition status, Aborted Command sense key. The Overall Command Timer does not alter the behavior of the Com-
mand Aging Limit or Recovery Time Limit. Each unit of this timer is 50 milliseconds. Setting the value to zero
disabled the feature.
•
LED Mode
is designed to control the operation of a drive LED driver.
- LED Mode = 0000b
The CMDAC bit controls the LED.
CMDAC = 1 (Command Active)
CMDAC = 0 (Motor Active)
- LED Mode = 0001b (Motor Active)
When the motor is spinning, the LED is high.
- LED Mode = 0010b (Command Active).
When there is a command active or in the queue, the LED is high.
•
Temperature Threshold
specifies the threshold value in degrees Celsius for the thermal sensor warning message. A
value of 0 selects the default value (85 degrees Celsius).
•
Command Aging Limit
This value controls the maximum time a command should wait in the command queue when the
CAEN bit is set. Each unit of this timer is 50 ms.
Содержание HUS151414VL3600
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