7K200 SATA OEM Specification
5 Data integrity
5.1Data loss on power off
Data loss will not be caused by a power off during any operation except the write operation.
A power off during a write operation causes the loss of any received or resident data that has not been written onto the disk media.
A power off during a write operation might make a maximum of one sector of data unreadable. This state can be recovered by a rewrite operation.
5.2Write Cache
When the write cache is enabled, the write command may complete before the actual disk write operation finishes. This means that a power off, even after the write command completion, could cause the loss of data that the drive has received but not yet written onto the disk.
In order to prevent this data loss, confirm the completion of the actual write operation prior to the power off by issuing a
Soft reset
COMRESET
Flush Cache command
Standby command
Standby Immediate command
Sleep command
Confirm the command’s completion.
5.3Equipment status
The 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 the
The access recalibration/tuning is complete.
The spindle speed meets the requirements for reliable operation. The
The appropriate error status is made available to the host system if any of the following conditions occur after the drive has become ready:
The spindle speed lies outside the requirements for reliable operation. The occurrence of a Write Fault condition.
5.4WRITE safety
The drive ensures that the data is written into the disk media properly. The following conditions are monitored during a write operation. When one of these conditions exceeds the criteria, the write operation is terminated and the automatic retry sequence is invoked.
Head off track External shock Low supply voltage
Spindle speed out of tolerance Head open/short
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