Western Digital Raptor WD1500ADFD User manual

Enterprise Hard Drives

•Lightning Fast – 10,000 RPM spin speed, 4.6 ms average

read seek time, and 16 MB cache for superlative performance.

•Unrivaled Reliability – 1.2 million hours MTBF at 24x7 100%

duty cycle, make this the world’s most reliable SATA drive.

•Enterprise-class SATA – World's fastest SATA drive random

I/O performance beats SCSI in most benchmarks.

Built for enterprise environments to match SCSI reliability and

performance, WD Raptor 10,000 RPM SATA hard drives provide

simplified connectivity at significantly less cost than parallel SCSI

drives. With up to 150 GB capacity, 16 MB cache, NCQ and Rotary

Acceleration Feed Forward (RAFF™) for state-of-the-art vibration

tolerance, WD Raptor offers the best combination of reliability,

high capacity, and performance for enterprise applications. Ideal for

servers, network attached storage, scientific computing, video

surveillance, enterprise backup and digital video.

WD Raptor

SATA Hard Drives

1.2 Million Hours MTBF

World’s Fastest SATA Drive

5-year Limited Warranty

World’s fastest and most

reliable SATA drive.

"Enterprise Disk Drives" Company of the Year

VARBusiness ARC 2006

Enterprise Hard Drives

WD Raptor

SATA Hard Drives

Western Digital, WD, the WD logo, Put Your Life On It, and WD Raptor are registered trademarks; and RAFF is a trademark of Western Digital Technologies, Inc.

Other marks may be mentioned herein that belong to other companies. Picture shown may vary from actual product. Product specifications subject to change without

environment.

Key Specifications

Interface: SATA

Form Factor: 3.5-inch

Spin Speed: 10,000 RPM

Cache: 16 MB

Access Time: 4.6 ms

Warranty: 5 years

Capacities

36 GB, 74 GB, 150 GB

Model Numbers

WD360ADFD, WD740ADFD,

WD1500ADFD

Frequently Asked Questions

What about SATA II – is this a SATA II drive?

SATA II is an industry specification to define those things necessary

for compatibility. SATA II has a number of optional features: NCQ,

SATA 3 Gb/s, port multiplier, port selector, asynchronous signal

recovery, soft settings preservation. All of these features are optional.

Instead of labeling a drive as “SATA II,” WD clearly and simply states

drive features. WD Raptor offers 36 to 150 GB, 10,000 RPM, 16 MB

cache, 1.5 Gb/s SATA, and SATA II NCQ. It’s important to understand

that hard drive performance is dependent on rotational speed and

seek time, not wire speed. The 10,000 RPM WD Raptor (at 1.5

Gb/s) outperforms ALL other SATA II (3 Gb/s) drives available today.

Does the WD Raptor offer queuing?

WD Raptor includes SATA II NCQ. Benchmark testing shows that

SATA II NCQ improves random I/O workload performance.

How does enterprise SATA compare to SCSI?

Enterprise SATA is proven. Problems related to reliability, performance,

and SATA RAID compatibility, have been resolved. Enterprise SATA

addresses all major enterprise requirements. SATA is in the

mainstream today because it brings SCSI-like performance and

reliability at a lower cost.

Is this drive compatible with SAS systems?

Yes, the WD Raptor drive is compatible with SAS systems, including

features such as hot plugability and NCQ.

Will SAS replace Enterprise SATA?

SAS systems are compatible with SATA hard drives. For the first

time, IT buyers can implement a single storage infrastructure that

offers both flexibility and scalability. Its ability to uniquely serve the

high-performance needs of the enterprise with SAS drives and also

the high-capacity needs with enterprise-class SATA storage allows it

to scale flexibly as enterprise needs change. This flexibility, combined

with efficiencies provided by combinations of SAS and SATA drives

that have common components (cables, connectors, enclosures and

backplanes) will allow the enterprise to meet new demand without

substantially growing existing IT budgets.

2178-001026-A05 Dec 2006

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