Description And Features; General Description; Product Features - Western Digital Purple PR1200M Technical Reference Manual

WD Purple™ PR1200M
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ESCRIPTION AND
1.1

General Description

WD Purple Surveillance Storage is built for 24/7 always-on surveillance in high
definition security systems that utilize higher hard drive bay counts and up to 64
cameras. Exclusive AllFrame 4K™ technology works with ATA streaming to reduce
error pixilation and video interruptions that occur when desktop hard drives are
incorrectly used as storage in security systems.
1.2

Product Features

Serial ATA (SATA) — Serial ATA (SATA) is the industry standard 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.
AllFrame 4K™ Technology — All WD Purple™ drives are equipped with AllFrame
4K™ technology, which improves ATA streaming to help reduce frame loss, improve
overall video playback, and increase the number of hard drive bays supported within
a NVR. Help make your surveillance solution future-ready knowing that WD Purple™
drives are ready for ultra high definition cameras.
IntelliSeek™ — Calculates optimum seek speeds to lower power consumption, noise,
and vibration.
Dynamic Fly Height Control — Designed to compensate for head/media separation
changes due to temperature and altitude. This feature adds video quality margins
across temperature and altitude changes.
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.
NoTouch™ Ramp Load Technology — The recording head never touches the disk
media ensuring significantly less wear to the recording head and media as well as
better drive protection in transit.
Dual Stage Actuator Technology — A head positioning system with dual-stage
actuators that improves positioning accuracy over the data track(s). The primary
stage provides course displacement; the secondary stage uses piezoelectric motion
to fine tune the head positioning to a higher degree of precision.
Advanced Format (AF) — Technology adopted by WD and other drive manufacturers
as one of multiple ways to continue growing hard drive capacities. AF is a more
efficient media format that enables increased areal densities.
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 Queuing (NCQ), which is supported by these hard drives.
Preemptive 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
2679-800065-A03
F
EATURES
RELEASED 5/4/17 (WD CONFIDENTIAL)

Description and Features

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