Replacement for WD4000KD: Drop-In Alternatives We Stock
Looking for a replacement for the WD4000KD (WD4000KD - Western Digital Caviar SE16 400GB 7200RPM SATA 1.5Gb/s 16MB 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 WD4000KD
| SKU | WD4000KD |
|---|---|
| Product | WD4000KD - Western Digital Caviar SE16 400GB 7200RPM SATA 1.5Gb/s 16MB Cache 3.5-inch Hard Drive |
| Current price | $211.00 |
| Stock status | In Stock |
| Detail page | View WD4000KD › |
Drop-in replacements for WD4000KD
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.
WD4000YD - Western Digital Caviar SE 400GB 7200RPM SATA 1.5Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000YD
Price: $165.79
WD4000YR - Western Digital Caviar RE2 400GB 7200RPM SATA 1.5Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000YR
Price: $172.42
WD4000AAKS - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKS
Price: $195.63
WD4000YR-01PLB0 - Western Digital Caviar RE2 400GB 7200RPM SATA 1.5Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000YR-01PLB0
Price: $211.00
WD400YR - Western Digital Caviar RE2 400GB 7200RPM SATA 1.5Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD400YR
Price: $217.24
WD4000AAKS-00TMA0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKS-00TMA0
Price: $217.89
WD4000KD-55NSB2 - Western Digital Caviar SE16 400GB 7200RPM SATA 1.5Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000KD-55NSB2
Price: $238.93
WD4000AAKSFR - Western Digital Caviar Blue 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKSFR
Price: $278.01
WD4000AAKS-00YGA0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKS-00YGA0
Price: $291.79
WD4000YD-00KRB0 - Western Digital Caviar SE 400GB 7200RPM SATA 1.5Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000YD-00KRB0
Price: $294.37
WD4000AAKS-00A7B0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKS-00A7B0
Price: $307.59
WD4000AAKS-00C8A0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKS-00C8A0
Price: $307.71
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.