Western Digital Purple PR1200M Technical Reference Manual page 12

Description and Features
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.
Femto Slider — These drives incorporate the femto slider form factor in which the
read/write head is mounted on the small, lightweight femto slider which 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 — A feature that allows the system to control whether the drive
will spin up immediately or wait until the interface is fully ready (this feature may not
be available in all configurations).
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.
2 RELEASED 5/4/17 (WD CONFIDENTIAL)
WD Purple™ PR1200M
2679-800065-A03