Replacement for WD400AB: Drop-In Alternatives We Stock
Looking for a replacement for the WD400AB (WD400AB - Western Digital Caviar 40GB 5400RPM ATA-100 2MB Cache 3.5-inch Hard Drive)? Pro Disk Network ships Western Digital drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the WD400AB
| SKU | WD400AB |
|---|---|
| Product | WD400AB - Western Digital Caviar 40GB 5400RPM ATA-100 2MB Cache 3.5-inch Hard Drive |
| Current price | $118.63 |
| Stock status | In Stock |
| Detail page | View WD400AB › |
Drop-in replacements for WD400AB
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
WD400-ATA - Western Digital Caviar 40GB 7200RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400-ATA
Price: $153.72
WD400MW - Western Digital Caviar 40GB 5400RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400MW
Price: $116.46
WD400AB-32CMB0 - Western Digital Caviar 40GB 5400RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400AB-32CMB0
Price: $143.39
WD400AB-22CDB0 - Western Digital Caviar 40GB 5400RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400AB-22CDB0
Price: $148.12
WD400AB-00CMB0 - Western Digital Caviar 40GB 5400RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400AB-00CMB0
Price: $344.84
WD400AB-00BVA0 - Western Digital Caviar 40GB 5400RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400AB-00BVA0
Price: $395.34
Western WD102AA Western Digital WD102AA Caviar 10GB 5400RPM IDE Ultra ATA/66 (ATA-5) 2MB Cache 3.5-Inch Hard Drive
SKU: WD102AA
Price: $155.79
WD400-60DGA0 - Western Digital Caviar 40GB 7200RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400-60DGA0
Price: $92.92
WD400-22JHC0 - Western Digital Caviar 40GB 7200RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400-22JHC0
Price: $92.92
WD400-00HEA0 - Western Digital Caviar 40GB 7200RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WD400-00HEA0
Price: $100.49
39M01291 - Western Digital Caviar SE 40GB 7200RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: 39M01291
Price: $120.03
WDE400BB-00DEA0 - Western Digital Caviar SE 40GB 7200RPM ATA-100 2MB Cache 3.5-inch Hard Drive
SKU: WDE400BB-00DEA0
Price: $126.70
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.