4.0
Data Integrity
4.1
Data loss at Power Off
The drive retains recorded data under all non-write operation.
N o more than one sector can be lost by power down during write operation while write cache is disa-
bled.
Power off during write operation may make an incomplete sector which will report hard data error when
read. The sector can be recovered by a re-write operation.
Hard reset does not cause any data loss.
4.2
Write Cache
Power off while write cache is enabled may cause loss of data which are remaining in the cache and have
not been flushed onto the disk media.
This means that there is a possibility that power off even after write command completion may cause
loss of data.
There are three ways to check if all data in the write cache have been flushed onto the disk. Checking
just before power off is recommended to prevent data loss.
−
To confirm successful completion of Software Reset.
−
To confirm successful completion of Flush Cache command.
−
To confirm successful completion of Check Power Mode command.
4.3
Equipment Status
Equipment status is available to the host system any time the drive is not ready to read, write, or seek. This
status normally exists at power-on time and will be maintained until the following conditions are satisfied:
Access recalibration/tuning is complete.
Spindle speed meets requirements for reliable operation.
Self-check of drive is complete.
Appropriate error status is made available to the host system if any of the following conditions occur after
the drive has once become ready:
Spindle speed outside requirements for reliable operation.
Occurrence of a W R I T E F A U L T condition.
Copyright IBM Corp. 1998
15
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Страница 59: ...6 7 3 Connector Locations Figure 47 Connector Locations Specification 51...
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Страница 69: ...Part 2 ATA Interface Specification Copyright IBM Corp 1998 61...
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Страница 188: ...Published in Japan S00K 0286 02...