Reliability - Western Digital Ultrastar DC HC310 Specifications

6.4

Reliability

6.4.1 Data Integrity
When the write cache option is disabled, no customer data is lost during power loss. If the write cache option is
active or has been recently used, some data loss can occur during power loss. To prevent the loss of data at power
off, confirm the successful completion of a FLUSH CACHE (E7h) or FLUSH CACHE EXT (EAh) command.
6.4.2 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.
6.4.3 Load/Unload
The product supports a minimum of 600,000 normal load/unloads in a 40° C environment.
Load/unload is invoked by transition of the HDD's power mode. (Chapter 4.5.3 Operating Modes)
Idle <-> Unload idle
Idle <-> Low rpm idle
6.4.4 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.
6.4.5 Preventive Maintenance
None
6.4.6 Data Reliability
Probability of not recovering data is 1 in 10
LDPC on the fly/ offline data correction
 4608 bit LDPC
 This implementation recovers maximum 2500 bits single burst error by on the fly correction and maximum 3500
bits single burst error by offline correction
15
bits read.
Western Digital Hard Disk Drive OEM Specification
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