Replacement for WD4000AAKS-00A7B0: Drop-In Alternatives We Stock
Looking for a replacement for the WD4000AAKS-00A7B0 (WD4000AAKS-00A7B0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/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 WD4000AAKS-00A7B0
| SKU | WD4000AAKS-00A7B0 |
|---|---|
| Product | WD4000AAKS-00A7B0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive |
| Current price | $307.59 |
| Stock status | In Stock |
| Detail page | View WD4000AAKS-00A7B0 › |
Drop-in replacements for WD4000AAKS-00A7B0
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.
WD4000AAKS - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKS
Price: $195.63
WD4000AAKS-00TMA0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKS-00TMA0
Price: $217.89
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
WD4000AAKS-00C8A0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000AAKS-00C8A0
Price: $307.71
WD4000YS-09MPB0 - Western Digital Caviar RE 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000YS-09MPB0
Price: $380.33
WD4000KS-00MNB0 - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000KS-00MNB0
Price: $405.54
WD4000KS - Western Digital Caviar SE16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000KS
Price: $405.54
WD4000KSRTL - Western Digital Caviar SE-16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000KSRTL
Price: $594.88
WD4000KS-00MUB0 - Western Digital Caviar SE-16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000KS-00MUB0
Price: $595.74
WD4000KS-19MNB0 - Western Digital Caviar SE-16 400GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD4000KS-19MNB0
Price: $595.74
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.