Hitachi hard disk 0J11285 500 GB 2.5 " 8 MB 0J11285 Scheda Tecnica
Codici prodotto
0J11285
Z5K500 OEM Specifications
21
5.1
5.2
5.3
5.4
5 Data integrity
Data loss on power off
Data loss will not be caused by a power off during any operation except write operation.
A power off during a write operation causes the loss of any received or resident data that has not
A power off during a write operation causes the loss of any received or resident data that has not
been written onto 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.
Write Cache
When the write cache is enabled, write commands may complete before the actual disk write operation
finishes. This means that a power off, even after the write command completion, could cause a loss of
data that the hard disk drive has received but not yet written onto a disk.
finishes. This means that a power off, even after the write command completion, could cause a loss of
data that the hard disk drive has received but not yet written onto a disk.
In order to prevent this data loss, confirm the completion of the actual write operation prior to the power
off by issuing one of the following operation.
off by issuing one of the following operation.
Soft reset
Hard reset
Flush Cache command
Standby command
Standby Immediate command
Sleep command
Hard reset
Flush Cache command
Standby command
Standby Immediate command
Sleep command
Confirm the command’s completion.
Equipment status
The equipment status is available to the host system any time the hard disk drive is not ready to read,
write, or seek. This status normally exists at the power-on time and will be maintained until the following
conditions are satisfied:
write, or seek. This status normally exists at the power-on time and will be maintained until the following
conditions are satisfied:
The access recalibration/tuning is complete.
The spindle speed meets the requirements for reliable operation.
The self-check of the hard disk drive is complete.
The spindle speed meets the requirements for reliable operation.
The self-check of the hard disk drive is complete.
The appropriate error status is made available to the host system if any of the following conditions occur
after the hard disk drive has become ready:
after the hard disk drive has become ready:
The spindle speed lies outside the requirements for reliable operation.
The occurrence of a Write Fault condition.
The occurrence of a Write Fault condition.
WRITE safety
The hard disk drive ensures that data is written into 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.
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
External shock
Low supply voltage
Spindle speed out of tolerance
Head open/short