IBM DTLA-305040 Hard Drive Specifications - Page 104

Reassign Function, Power-Up In Standby feature set

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10.11 Reassign Function Reassign Function is used with read commands and write commands. The sectors of data for reassignment are prepared as the spare data sector. This reassignment information is registered internally and the information is available right after completing the reassign function. Also the information is used on the next power on reset or hard reset. If the number of the spare sector reaches 0 sector, the reassign function will be disabled automatically. The spare sectors for reassignment are located at the end of device. As a result of reassignment the physical location of logically sequenced sectors will be dispersed. 10.11.1 Auto Reassign Function The sectors which show some errors may be reallocated automatically when specific conditions are met. The spare sectors for reallocation are located at the end of drive. The conditions for auto-reallocation are described below. 10.11.1.1 Nonrecovered write errors When a write operation cannot be completed after the Error Recovery Procedure (ERP) is fully carried out, the sector(s) are reallocated to the spare location. An error is reported to the host system only when the write cache is disabled and the auto reallocation has failed. If the write cache function is ENABLED, and when the number of available spare sectors reaches 0 sector, both auto reassign function and write cache function are disabled automatically. 10.11.1.2 Nonrecovered read errors When a read operation is failed after defined ERP is fully carried out, a hard error is reported to the host system. This location is registered internally as a candidate for the reallocation. When a registered location is specified as a target of a write operation, a sequence of media verification is performed automatically. When the result of this verification meets the criteria, this sector is reallocated. 10.11.1.3 Recovered read errors When a read operation for a sector has failed once and then has recovered at the specific ERP step, this sector of data is reallocated automatically. A media verification sequence may be run prior to the relocation according to the predefined conditions. 10.12 Power-Up In Standby feature set The Power-Up In Standby feature set allows devices to be powered-up into the Standby power management state to minimize inrush current at power-up and to allow the host to sequence the spin-up of devices. This feature set will be enabled/disabled via the SET FEATURES command or use of jumper. When enabled by a jumper, the feature set shall not be disabled via the SET FEATURES command. The enabling of this feature set shall be persistent after power cycle. A device needs a SET FEATURES subcommand to spin-up to active state when the device has powered up into Standby. The device remains in Standby until the SET FEATURES subcommand is received. If power-up into Standby is enabled, when an IDENTIFY DEVICE is received while the device is in Standby as a result of powering up into Standby, the device shall set word 0 bit 2 to one to indicate that the response is incomplete, then only words 0 and 2 are correctly reported. Deskstar 40GV & 75GXP hard disk drive specifications 92

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10.11 Reassign Function
Reassign Function is used with read commands and write commands. The sectors of data for reassign-
ment are prepared as the spare data sector.
This reassignment information is registered internally and the information is available right after complet-
ing the reassign function. Also the information is used on the next power on reset or hard reset.
If the number of the spare sector reaches 0 sector, the reassign function will be disabled automatically.
The spare sectors for reassignment are located at the end of device. As a result of reassignment the phy-
sical location of logically sequenced sectors will be dispersed.
10.11.1 Auto Reassign Function
The sectors which show some errors may be reallocated automatically when specific conditions are met.
The spare sectors for reallocation are located at the end of drive. The conditions for auto-reallocation are
described below.
10.11.1.1
Nonrecovered write errors
When a write operation cannot be completed after the Error Recovery Procedure (ERP) is fully carried
out, the sector(s) are reallocated to the spare location. An error is reported to the host system only when
the write cache is disabled and the auto reallocation has failed.
If the write cache function is ENABLED, and when the number of available spare sectors reaches 0
sector, both auto reassign function and write cache function are disabled automatically.
10.11.1.2
Nonrecovered read errors
When a read operation is failed after defined ERP is fully carried out, a hard error is reported to the host
system. This location is registered internally as a candidate for the reallocation. When a registered
location is specified as a target of a write operation, a sequence of media verification is performed auto-
matically. When the result of this verification meets the criteria, this sector is reallocated.
10.11.1.3
Recovered read errors
When a read operation for a sector has failed once and then has recovered at the specific ERP step, this
sector of data is reallocated automatically. A media verification sequence may be run prior to the
relocation according to the predefined conditions.
10.12
Power-Up In Standby feature set
The Power-Up In Standby feature set allows devices to be powered-up into the Standby power manage-
ment state to minimize inrush current at power-up and to allow the host to sequence the spin-up of
devices.
This feature set will be enabled/disabled via the SET FEATURES command or use of jumper. When en-
abled by a jumper, the feature set shall not be disabled via the SET FEATURES command. The enabling
of this feature set shall be persistent after power cycle.
A device needs a SET FEATURES subcommand to spin-up to active state when the device has powered
up into Standby. The device remains in Standby until the SET FEATURES subcommand is received.
If power-up into Standby is enabled, when an IDENTIFY DEVICE is received while the device is in
Standby as a result of powering up into Standby, the device shall set word 0 bit 2 to one to indicate that
the response is incomplete, then only words 0 and 2 are correctly reported.
Deskstar 40GV & 75GXP hard disk drive specifications
92