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Description and Features
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Pre-emptive Wear Leveling (PWL) —This WD feature provides a solution for pro-
tecting 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 posi-
tion 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 fea-
ture ensures reliability for applications that perform a high incidence of read/
write operations at the same physical location on the disk.
S.M.A.R.T. Command Transport (SCT) — The SCT Command Transport feature set
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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/
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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, organiza-
tionally unique identifier (OUI) and serial number. WD's OUI is 0014EEh.
Reliability Features Set-Data Lifeguard™ — Representing WD's ongoing commit-
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ment to data protection, Data Lifeguard includes features that enhance the drives
ability to prevent data loss. Data Lifeguard data protection utilities include ther-
mal management, an environmental protection system, and embedded error
detection and repair features that automatically detect, isolate, and repair prob-
lem areas that may develop over the extended use of the hard drive. With these
enhanced data reliability features, the drive can perform more accurate monitor-
ing, error repair, and deliver exceptional data security.
Hot Plug Support — SATA supports hot plugging (also known as "hot swapping"),
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the ability to swap out a failed hard drive without having to power down the sys-
tem or reboot. This capability contributes to both data availability and service-
ability 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
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activity LED output which is ON during command execution and OFF otherwise.
Fluid Dynamic Bearings (FDB) — Bearing design that incorporates a layer of high-
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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 acous-
tics.
Staggered Spin-Up — SATA 3 Gb/s feature that allows the system to control
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whether the drive will spin up immediately or wait until the interface is fully ready
(available for specific OEM configurations).
CacheFlow™ —WD's unique, multi-generation caching algorithm evaluates the
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way data is read from and written to the drive and adapts "on-the-fly" to the opti-
mum read and write caching methods. CacheFlow minimizes disk seek operations
and overheads due to rotational latency. CacheFlow supports sequential and ran-
dom 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 collec-
tively write them to the hard disk.
48-bit Logical Block Addressing (LBA) — WD SATA drives support both 48-bit
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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.
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RELEASED 5/3/17 (WD CONFIDENTIAL)
WD Purple PR1334M
2679-800084-A04
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