Part No: WD400LB-55DNA0 - Western Digital Caviar 40GB 7200RPM ATA-100 2MB Cache 3.5-inch Hard Disk Drive
Westren Digital

Part No: WD400LB-55DNA0 - Western Digital Caviar 40GB 7200RPM ATA-100 2MB Cache 3.5-inch Hard Disk Drive

MPN: WD400LB-55DNA0
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Western Digital Caviar 40GB 3.5-inch hard disk drive (part number WD400LB-55DNA0) featuring 7200 RPM spindle speed, ATA-100 (IDE/PATA) interface, and 2MB cache. This drive supports sustained throughput typical of early-2000s desktop and workstation applications where capacity and reliability were primary considerations. Compatible with legacy systems using standard 40-pin IDE connectors and appropriate power delivery. Suitable for archival reference, testing environments, or systems where modern capacity is not required. Form factor and interface specifications limit use to systems predating Serial ATA adoption.

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