11.14 Reassign Function. Hitachi IC25N080ATMR04, IC25N040ATMR04-0 - Travelstar 40GB Laptop Hard Drive 9.5mm 2.5 Inch Notebook HDD, IC25N080ATMR04-0 - 3E034 - Dell 80GB Laptop Hard Drive, Travelstar 80GN, IC25N020ATMR04, 08K0910, IC25N040ATMR04, IC25N060ATMR04, IC25N030ATMR04

11.14 Reassign Function

The Reassign Function is used with read commands and write commands. The sectors of data for reassignment are prepared as the spare data sector. The one entry can register 256 consecutive sectors maximum.

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 tracks for reassignment are located at regular intervals from Cylinder 0. As a result of reassignment, the physical location of logically sequenced sectors is dispersed.

11.14.1 Auto Reassign Function

The sectors that show some errors may be reallocated automatically when specific conditions are met. The spare tracks for reallocation are located at regular intervals from Cylinder 0. The conditions for auto-reallocation are described below.

Nonrecovered write errors

When a write operation can not 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 fails.

If the number of available spare sectors reaches 16 sectors, the write cache function will be disabled automatically.

Nonrecovered read errors

When a read operation fails after a 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 verifications is performed automatically. When the result of this verification meets the criteria, this sector is reallocated.

Recovered read errors

When a read operation for a sector fails once and then is 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.

Travelstar 80GN Hard Disk Drive Specification