World Wide Name (Wwn); Reliability Features Set; Data Lifeguard; Thermal Management - Western Digital Purple PR1200M Technical Reference Manual

WD Purple™ PR1200M

3.13 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.

3.14 Reliability Features Set

3.14.1 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 Diagnostics
utility will overwrite user data.
Download the latest versions of the Data Lifeguard Diagnostic and Data Lifeguard
Tools programs at

3.14.2 Thermal Management

The drive is designed with Thermal Management features for high reliability.
State-of-the-art mechanical design — Mechanical design is optimized to reduce

the drive's temperature. State-of-the-art thermal dissipation and windage design
is employed.
Closed loop servo management — Thermal management monitors the drive

temperature and can control servo operations to maintain a stable operating
temperature under high temperature conditions. This is a closed loop servo and
thermal control system.
S.M.A.R.T. HDA Temperature Attribute — The S.M.A.R.T. HDA Temperature

Attribute is supported. The S.M.A.R.T. temperature value is reported within ±3°C
of the base casting temperature.
2679-800065-A03
support.wdc.com.
RELEASED 5/4/17 (WD CONFIDENTIAL)
Product Features
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