Reliability - Hitachi CinemaStar P7K500 Specifications

5.6

Reliability

5.6.1 Data integrity
No more than one sector is lost at Power loss condition during the write operation when the write cache
option is disabled. If the write cache option is active, the data in write cache will be lost. To prevent the loss
of customer data, it is recommended that the last write access before power off be issued after setting the
write cache off.
5.6.2 Cable noise interference
To avoid any degradation of performance throughput or error rate when the interface cable is routed on top
or comes in contact with the HDA assembly, the drive must be grounded electrically to the system frame by
four screws. The common mode noise or voltage level difference between the system frame and power
cable ground or AT interface cable ground should be in the allowable level specified in the power
requirement section.
5.6.3 Start/stop cycles
The drive withstands a minimum of 50,000 start/stop cycles in a 40° C environment and a minimum of
10,000 start/stop cycles in extreme temperature or humidity within the operating range. .
5.6.4 Preventive maintenance
None
5.6.5 Data reliability
Probability of not recovering data is 1 in 10
ECC On The Fly correction
1 Symbol : 10 bits
No Interleave
34 symbol ECC
This implementation always recovers 16 symbol random erros and a 330-bit continuous burst error
5.6.6 Required Power-Off Sequence
The required BIOS sequence for removing power from the drive is as follows:
Step 1: Issue one of the following commands.
Standby
Standby immediate
Sleep
Note: Do not use the Flush Cache command for the power off sequence because this command does
not invoke Unload
Step 2: Wait until the Command Complete status is returned. In a typical case 350 ms are required for
the command to finish completion; however, the BIOS time out value needs to be 30 seconds
considering error recovery time. Refer to section 11.0 "Timings," on page 266.
Step 3: Terminate power to HDD.
HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
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