Replacement for WDC6400AARS: Drop-In Alternatives We Stock
Looking for a replacement for the WDC6400AARS (WDC6400AARS - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 64MB 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 WDC6400AARS
| SKU | WDC6400AARS |
|---|---|
| Product | WDC6400AARS - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 64MB Cache 3.5-inch Hard Drive |
| Current price | $279.55 |
| Stock status | In Stock |
| Detail page | View WDC6400AARS › |
Drop-in replacements for WDC6400AARS
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.
WD6400AADS-11M2B1 - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: WD6400AADS-11M2B1
Price: $222.49
WD6400AARS - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: WD6400AARS
Price: $276.07
WD6400AADS - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: WD6400AADS
Price: $318.32
WD6400AACS-00M3B0 - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD6400AACS-00M3B0
Price: $351.99
WD6400AACS-00G8B1 - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD6400AACS-00G8B1
Price: $367.29
WD6400AADS-00M2B0 - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: WD6400AADS-00M2B0
Price: $417.54
WD6400AACS - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD6400AACS
Price: $429.83
WD6400AACS-00G8B0 - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD6400AACS-00G8B0
Price: $444.57
WD6400AACS-00D6B1 - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD6400AACS-00D6B1
Price: $478.42
WD6400AARS-00Y5B1 - Western Digital Caviar Green 640GB 5400RPM SATA 3Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: WD6400AARS-00Y5B1
Price: $546.53
WD6400AAVS - Western Digital Caviar Green 640GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD6400AAVS
Price: $235.79
WD6400AAVS-00G9B0 - Western Digital Caviar Green 640GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: WD6400AAVS-00G9B0
Price: $473.68
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.