The Western Digital 40GB 3.5-inch hard disk drive (Part No. 255578-001) features a 7200 RPM spindle speed and ATA-100 interface for reliable sequential data access and transfer rates typical of early-2000s enterprise storage. The 3.5-inch form factor suits tower and rack-mount server installations, NAS enclosures, and external storage arrays. ATA-100 connectivity delivers up to 100 MB/s theoretical throughput, compatible with legacy server backplanes and storage controllers that support parallel ATA standards. This drive is well-suited for archival systems, backup appliances, or replacement in existing infrastructure where modern SATA drives are unavailable or unnecessary. All units are tested and guaranteed; available via quote.
