IBM DTTA-351010 Hard Drive Specifications - Page 96

Automatic Drive Maintenance ADM

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10.10.1 Auto Reassign Function The sectors those 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. Non recovered 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 is 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. If the command is without retry and the write cache function is disabled, the auto reassign function is not invoked. Non recovered read errors When a read operation is failed after defined E R P 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. Recovered read errors When a read operation for a sector failed once then recovered at the specific E R P step, this sector of data is reallocated automatically. A media verification sequence may be run prior to the relocation according to the pre-defined conditions. 10.11 Automatic Drive Maintenance (ADM) A D M function is equipped to maintain the reliability even in continuous usage. A D M function is to go into Standby mode automatically after detecting idle mode at intervals of 6 days. This function is always enabled regardless of Standby Timer value. The detail of Standby Timer is described in 12.6, "Idle (E3h/97h)" on page 110, and 12.32, "Standby (E2h/96h)" on page 157. The 6 days counter is reset at the following. Power on Ready Entering Standby mode by Standby Command Entering Standby mode by Standby Timer Both Soft Reset and Hard Reset do not disturb the spin down of ADM. If a command is received during spin down of ADM, the drive quits the spin down and tries to complete the command as soon as possible. In case the spin down of A D M is disturbed by a command, it is retried 12 hours later. For timeout concern, refer to 13.0, "Timeout Values" on page 171. 88 OEM Specifications for DTTA-3xxxxx

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10.10.1
Auto Reassign Function
The sectors those 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.
Non recovered 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 is 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.
If the command is without retry and the write cache function is disabled, the auto reassign function is not
invoked.
Non recovered 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.
Recovered read errors
When a read operation for a sector failed once then 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
pre-defined conditions.
10.11
Automatic Drive Maintenance (ADM)
ADM function is equipped to maintain the reliability even in continuous usage. ADM function is to go into
Standby mode automatically after detecting idle mode at intervals of 6 days. This function is always enabled
regardless of Standby Timer value.
The detail of Standby Timer is described in 12.6, “Idle
(E3h/97h)” on page 110, and 12.32, “Standby
(E2h/96h)” on page 157.
The 6 days counter is reset at the following.
Power on Ready
Entering Standby mode by Standby Command
Entering Standby mode by Standby Timer
Both Soft Reset and Hard Reset do not disturb the spin down of ADM.
If a command is received during spin down of ADM, the drive quits the spin down and tries to complete the
command as soon as possible.
In case the spin down of ADM is disturbed by a command, it is retried 12 hours later.
For timeout concern, refer to 13.0, “Timeout Values” on page 171.
88
OEM Specifications for DTTA-3xxxxx