Description And Features; General Description; Product Features - Western Digital Re EX800M Technical Reference Manual

EX800M
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ESCRIPTION AND
1.1

General Description

WD Re datacenter hard drives offer up to 4 TB capacities and are available with SAS or SATA
interface. With the highest error tolerance and MTBF of any capacity-optimized drive, WD Re delivers
the durability and 24x7x365 reliability required in tightly packed vibration prone multi-drive systems.
The combination of high-capacity, peak performance and robust design make WD Re drives ideal for
heavy workload environments, cloud storage, RAID arrays, external storage arrays, data warehousing
and mining applications.
1.2

Product Features

Optional Self Encrypting Drive (SED) — Utilizing an AES 256 bit encryption engine for Crypto
erase capability, WD supports both industry standard commands of the Sanitize Feature Set and
also the Security Feature Set which utilizes the Secure Erase Unit (SEU) enhanced mode bit.
Serial ATA (SATA) — Serial ATA (SATA) is the next generation bus interface for hard drives. It is
designed to replace Parallel ATA, and has many advantages including increased transfer rate,
improved signal integrity, enhanced data protection, and hot plug support.
Time-Limited Error Recovery (TLER) — TLER prevents hard drive error recovery fallout by
limiting the time the drive spends in error recovery, providing increased performance, improved
availability, and lower total cost of ownership in RAID arrays.
Rotary Acceleration Feed Forward (RAFF) — These drives employ RAFF technology to maintain
hard drive performance in high vibration environments through adaptive compensation of the
servo system.
Perpendicular Magnetic Recording (PMR) — With PMR technology the magnetization of each
data bit is aligned vertically to the spinning disk, rather than longitudinally as has been the case in
hard drive technology for decades. This enables more data on a given disk than is possible with
conventional longitudinal recording, and provides a platform for future expansion of hard drive
densities.
IntelliSeek™ — Key product feature that calculates optimum seek speeds to lower power
consumption, noise, and vibration.
StableTrac™ — The motor shaft is secured at both ends to reduce system-induced vibration and
stabilize platters for accurate tracking, during read and write operations.
Native Command Queuing (NCQ) — Performance of a random I/O workload can be improved
through intelligent re-ordering of the I/O requests so they read/write to and from the nearest
available sectors and minimize the need for additional disk revolutions or head actuator
movement. This improvement can be achieved though Native Command Queing (NCQ) , which
is supported by these hard drives.
Pre-emptive Wear Leveling (PWL) — This WD feature provides a solution for protecting the
recording media against mechanical wear. In cases where the drive is so busy with incoming
commands that it is forced to stay in a same cylinder position for a long time, the PWL control
engine initiates forced seeks so that disk lubricant maintains an even distribution and does not
become depleted. This feature ensures reliability for applications that perform a high incidence of
read/write operations at the same physical location on the disk.
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SED drives may require TCG-compliant host or controller support. SED drives may not be available in all countries
2679-771339-A05
F
EATURES
RELEASED 8/13/13

Description and Features

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