The WD400JB-00FSA0 is a Western Digital Caviar SE 40GB hard disk drive designed for legacy desktop and server environments. This 3.5-inch form factor drive operates at 7200 RPM with an 8MB cache and connects via ATA-100 (PATA) interface, delivering sustained throughput suitable for older workstations and small business servers from the early 2000s era. The drive is compatible with systems supporting standard IDE/PATA connections and is typically used in refurbished desktop deployments, archival storage, or as replacement components for aging office equipment that cannot accommodate modern SATA or SAS drives.
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