Western Digital Re EX800M Technical Reference Manual page 10

Description and Features EX800M
MicroFemto Slider — These drives incorporate the next generation of femto slider form factor in
which the read/write head is mounted on the small, lightweight microfemto slider that allows the
head to move more quickly from track to track on the disk.
S.M.A.R.T. Command Transport (SCT) — The SCT Command Transport feature set provides a
method for a host to send commands and data to a device and for a device to send data and status
to a host using log pages.
World Wide Name (WWN) — 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.
Reliability Features Set-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.
Hot Plug Support — SATA supports hot plugging (also known as "hot swapping"), the ability to
swap out a failed hard drive without having to power down the system or reboot. This capability
contributes to both data availability and serviceability without any associated downtime, making it
a critical feature for extending SATA into enterprise applications.
Active LED Status — The drive supports external LED requirements. It provides an activity LED
output which is ON during command execution and OFF otherwise.
Fluid Dynamic Bearings (FDB) — Bearing design that incorporates a layer of high-viscosity
lubricant instead of ball bearings in the hard drive spindle motor. As an alternative to conventional
ball bearing technology, FDB designs provide increased non-operational shock resistance, speed
control, and improved acoustics.
Staggered Spin-Up — Next generation SATA 6 Gb/s feature that allows the system to control
whether the drive will spin up immediately or wait until the interface is fully ready.
CacheFlow™ —WD's unique, multi-generation caching algorithm evaluates the way data is read
from and written to the drive and adapts "on-the-fly" to the optimum read and write caching
methods. CacheFlow minimizes disk seek operations and overheads due to rotational latency.
CacheFlow supports sequential and random write cache. With write cache and other CacheFlow
features, the user can cache both read and write data. The cache can hold multiple writes and
collectively write them to the hard disk.
48-bit Logical Block Addressing (LBA) — WD SATA drives support both 48-bit and 28-bit LBA
and CHS-based addressing. LBA is included in advanced BIOS and operating system device
drivers and ensures high capacity disk integration.
Power Management — The drive supports the ATA and SATA power management command
set, allowing the host to reduce the power consumption of the drive by issuing a variety of power
management commands.
Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) — S.M.A.R.T. enables a
drive's internal status to be monitored through diagnostic commands at the host level and during
offline activities. S.M.A.R.T. devices employ data analysis algorithms that are used to predict the
likelihood of some near-term degradation or fault conditions. When used with a S.M.A.R.T.
application, the drive can alert the host system of a negative reliability status condition. The host
system can then warn the user of the impending risk of data loss and recommend an appropriate
action.
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