42D0637 Technical Specifications
Manufacturer IBM
Product Type Internal Hard Drive
Form Factor 2.5-inch
Capacity 300GB
Data Transfer Rate : 6Gbps
Cache 64 MB
Spindle Speed 10000 RPM
Drive Interface Type SAS 6.0 Gbps
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42D0637 IBM 42D0638 42D0639 300 GB 10K RPM 2.5″ SAS Hard Drive
$175
Manufacturer IBM
Product Type Internal Hard Drive
Form Factor 2.5-inch
Capacity 300GB
Data Transfer Rate : 6Gbps
Cache 64 MB
Spindle Speed 10000 RPM
Drive Interface Type SAS 6.0 Gbps

The Western Digital WD2500BHTZ is a high‑performance 250 GB internal hard disk drive from Western Digital’s legendary VelociRaptor family, engineered for users who need faster access and responsiveness than traditional 7200 RPM drives can provide. Unlike standard desktop HDDs, the VelociRaptor spins at a blistering 10 000 RPM and features a SATA III 6 Gb/s interface, allowing it to deliver sustained data throughput and quicker read/write access that benefits workstations, creative applications and performance‑oriented systems.
Whether installed in a desktop chassis or integrated into a high‑performance storage array, the delivers a notable combination of rotational speed, cache efficiency and sustained throughput that makes it a strong choice for applications where traditional HDDs fall short.

The range of scores (95th – 5th percentile) for the Hitachi HTS543225A7A384 250GB is 29.9%. This is a relatively narrow range which indicates that the Hitachi HTS543225A7A384 250GB performs reasonably consistently under varying real world conditions.

Quiet – In a notebook drive, silence is golden. WD’s exclusive WhisperDrive™ combines state-of-the-art seeking algorithms to yield one of the quietest 2.5-inch hard drives on the market. These algorithms also optimize the way a drive seeks for data, which significantly improves power consumption. So now silence (and longer battery life) is golden.
Reliable and Rugged – WD’s ShockGuard™ technology protects the drive mechanics and platter surfaces from shocks. WD’s SecurePark ™ parks the recording heads off the disk surface during spin up, spin down and when the drive is off. This ensures the recording head never touches the disk surface resulting in improved long term reliability due to less head wear, and improved non-operational shock tolerance.

The range of scores (95th – 5th percentile) for the WD Blue 2.5″ 320GB (2009) is 27.9%. This is a relatively narrow range which indicates that the WD Blue 2.5″ 320GB (2009) performs reasonably consistently under varying real world conditions.
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