Review Index:

Western Digital Raptor X 150 GB SATA HDD Review

Subject: Storage
Manufacturer: Western Digital

Introduction and Specifications

In the world of enthusiast PCs, no other hard drive captured the hearts of users quite like the Raptor.  Starting with its first iteration at 36 GB and followed later by the 74 GB model, Raptors have clearly had the performance lead since their introduction.  Any computer user that wanted the fastest storage in their system knew they needed at least one Raptor hard drive.  The industry knew it too, as every system we received in for reviews from AMD, NVIDIA and others featured the Raptor to showcase the best possible user experience.

Unfortunately, many users think that the 74 GB model has sat on top of that throne for too long, and we all eagerly await an update from Western Digital.  That update is finally here as the Raptor X is widely available offering added capacity, higher platter density and a special twist for modders.  

Specifications (from

Performance Specifications
Rotational Speed 10,000 RPM (nominal)
Buffer Size 16 MB
Average Latency 2.99 ms (nominal)
Contact Start/Stop Cycles 20,000 minimum

Seek Times
Read Seek Time 4.6 ms
Write Seek Time 5.2 ms (average)
Track-To-Track Seek Time 0.4 ms (average)
Full Stroke Seek 10.2 ms (average)

Transfer Rates
Buffer To Host (Serial ATA) 1.5 Gb/s (Max)
Buffer To Disk 84 MB/s (Sustained)

Recommended Configuration Parameters
Number of Heads (Physical) 4

Physical Specifications
Formatted Capacity 150,039 MB
Capacity 150 GB
Interface SATA 150 MB/s
Actuator Type Rotary Voice Coil
Number of Platters 2
Bytes Per Sector 512
User Sectors Per Drive 293,046,768
Servo Type Embedded

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