World Wide Name (Wwn); Reliability Features Set; Data Lifeguard - Western Digital caviar blue xl500s Technical Reference Manual

Product Features
temperature. Applications include Enterprise, Laptop, Desktop and Consumer Electronics.
SCT TR reports the maximum and minimum sustained operating limits, warning level limits,
and drive damage limits. In addition to reporting the limits, SCT TR returns the current drive
temperature (a temperature history which the host can use to predict heating or cooling
trends) and the maximum temperature acheived during the lifetime of the drive as well as the
highest temperature achieved since the power was applied to the drive. Detailed information
on this capability can be found in ATA8-ACS.
3.9

World Wide Name (WWN)

It has become a critical requirement that hard drives be uniquely identified by computer
systems. This allows a drive to maintain its identity as it is transported from system to system
or placed on a network. IEEE has defined a format for serial numbers that is widely recognized
in the computing industry by adding World Wide Name (WWN) to ATA/ATAPI-7 in 2002.
The World Wide Name (WWN) defined in ATA/ATAPI-7 is a modification of the IEEE
Extended Unique Identifier 64 bit standard (EUI-64) and is comprised of three major
components: naming authority, organizationally unique identifier (OUI) and serial number.
WD's OUI is 0014EEh.
3.10

Reliability Features Set

3.10.1 Data Lifeguard™

Representing WD's ongoing commitment to data protection, Data Lifeguard includes features
that enhance the drive's ability to prevent data loss. Data Lifeguard data protection utilities
include thermal management, an environmental protection system, and embedded error
detection and repair features that automatically detect, isolate, and repair problem areas that
may develop over the extended use of the hard drive. With these enhanced data reliability
features, the drive can perform more accurate monitoring, error repair, and deliver exceptional
data security.
This self-tuning feature is performed during offline data collection scan. All user sectors on the
hard drive are scanned during times of no activity from the host. Any sector determined to be
written poorly (e.g., off-track), or that is difficult to recover (e.g., because of a developing
media defect or thermal asperity), is marked for repair. Data Lifeguard actively guards your
data, even if S.M.A.R.T. operations are disabled.
All WD drives are defect-free and low-level formatted at the factory. After prolonged use, any
drive, including a WD drive, may develop defects. If you continue receiving data errors in any
given file, use the Data Lifeguard Diagnostics utility to recover, relocate and rewrite the user
data to the nearest spare sector and maintain a secondary defect list.
CAUTION: As with all format utilities, some options in the Data Lifeguard
Download the latest versions of the Data Lifeguard Diagnostic and Data Lifeguard Tools
programs at
18
Diagnostics utility will overwrite user data.
http://support.wdc.com.
RELEASED 10/21/10 (WD CONFIDENTIAL)
XL500S
2679-701211-A06