Western Digital Re EX800M, Technical Reference Manual, Page: 35 / 60

EX800M Reliability
2679-771339-A05 RELEASED 8/13/13 27
4.2.2 Environmental Interference
When evaluating systems under conditions of EMI, the performance of the drive within the system
shall be considered acceptable if the drive does not generate an unrecoverable condition. This
unrecoverable condition is defined as one that:
1. Is not detected and corrected by the drive itself.
2. Is not capable of being detected from the error or fault status provided through the drive or its
interface.
3. Is not capable of being recovered by normal drives or system recovery methods with out operator
intervention.
4.3 Reliability Features Set
4.3.1 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 drive. With these enhanced data reliability features, the drive can perform more accurate
monitoring, error repair, and deliver exceptional data security.
4.3.2 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.
„
SMART HDA Temperature Attribute —The SMART HDA Temperature Attribute is
supported.
„
Ducted airflow —Provides protection to the Read/Write element from heated air.
4.3.3 Internal Environmental Protection System
This system protects the inside environment of the drive from contamination. System features include:
„
Filtration System to ensure fast clean-up times
„
Directed airflow to maximize mechanical cooling
„
Increase casting surface area to maximize cooling
„
Breather filter located at low pressure area
„
Enhanced heat dissipation
4.3.4 Defect Management
Every WD drive undergoes factory-level intelligent burn in, which thoroughly tests for and maps out
defective sectors on the media before the drive leaves the manufacturing facility. Following the factory
tests, a primary defect list is created. The list contains the cylinder, head, and sector numbers for all
defects.
* Default shipping configuration has Data Lifeguard feature disabled for power management optimization.