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Product Features
Auto-activate DMA — provides increased command efficiency through
automated activation of the DMA controller.
Device Configuration Overlay (DCO) — allows hiding of supported features via a
SATA feature mask.
3.2
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.
3.3
IntelliSeek
WD's unique IntelliSeek technology proactively calculates an optimum seek speed to
eliminate hasty movement of the actuator that produces noise and requires power,
which is common in other drives. With IntelliSeek, the actuator's movement is
controlled so the head reaches the next target sector just in time to read the next
piece of information, rather than rapidly accelerating and waiting for the drive
rotation to catch up. This smooth motion reduces power usage by more than 60
percent compared with standard drives, as well as quiets seek operation and lowers
vibration.
3.4
Dynamic Fly Height Control
This feature is designed to compensate for head/media separation changes due to
temperature and altitude. It adds video quality margins across temperature and
altitude changes.
3.5
Perpendicular Magnetic Recording (PMR)
In perpendicular magnetic recording (PMR), 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. In longitudinal recording, as the bits become
smaller and closer together, they experience an increasing demagnetizing field, much
like two bar magnets that are placed end-to-end repel one another. A property of the
media called coercivity must be increased to counteract the demagnetization to keep
the bits stable under thermal fluctuations; otherwise data corruption may occur over
time. Higher media coercivity has pushed the recording head write field to the limit of
known materials.
In perpendicular recording, the adjacent bits attract instead of repel (as with bar
magnets placed side by side,) creating more thermally stable bits. In addition, the
media contains a magnetically soft underlayer (SUL) beneath the recording layer. This
SUL allows a larger effective write field, thus higher coercivity media, enabling further
increases in density. Lastly, because of the vertical orientation of the bits, the PMR
recording layer tends to be thicker than that used for longitudinal recording,
providing increased signal for the read heads. All of these benefits enable WD
engineers to reliably pack more data on a given disk than is possible with
conventional longitudinal recording.
14
RELEASED 5/4/17 (WD CONFIDENTIAL)
WD Purple™ PR1200M
2679-800065-A03
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