Replacement for WD4003FFBX: Drop-In Alternatives We Stock
Looking for a replacement for the WD4003FFBX (WD4003FFBX - Western Digital Red Pro NAS 4TB 7200RPM SATA 6Gbps 256MB 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 WD4003FFBX
| SKU | WD4003FFBX |
|---|---|
| Product | WD4003FFBX - Western Digital Red Pro NAS 4TB 7200RPM SATA 6Gbps 256MB Cache 3.5-inch Hard Drive |
| Current price | $382.59 |
| Stock status | In Stock |
| Detail page | View WD4003FFBX › |
Drop-in replacements for WD4003FFBX
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.
WD4003FFBX-68MU3N0 - Western Digital Red Pro NAS 4TB 7200RPM SATA 6Gbps 256MB Cache 3.5-inch Hard Drive
SKU: WD4003FFBX-68MU3N0
Price: $380.04
Western WDS400T2R0A-68CKB0 Western Digital WDS400T2R0A-68CKB0 Red SA500 4TB SATA 6Gb/s 2.5-inch NAS Internal Solid State Drive
SKU: WDS400T2R0A-68CKB0
Price: $1,984.21
Western WD8005FFBX Western Digital WD8005FFBX Red Pro 8TB 7200RPM SATA 6Gb/s 256MB Cache NAS Hard Drive
SKU: WD8005FFBX
Price: $703.95
Western WD260KFGX Western Digital WD260KFGX Red Pro 26TB 7200RPM SATA 6Gb/s 512MB Cache CMR 3.5-inch NAS Hard Drive
SKU: WD260KFGX
Price: $1,631.58
WD40EFZX - Western Digital Red Plus NAS 4TB 5400RPM SATA 6Gb/s 128MB Cache 3.5-inch Hard Drive
SKU: WD40EFZX
Price: $294.74
WD40EFAX - Western Digital Red NAS 4TB 5400RPM SATA 6Gb/s 256MB Cache 3.5-inch Hard Drive
SKU: WD40EFAX
Price: $318.32
WDS400T1R0A - Western Digital Red SA500 4TB NAS Triple-Level Cell SATA 6Gb/s 3D NAND 2.5-inch Solid State Drive
SKU: WDS400T1R0A
Price: $1,008.00
WD102KFBX-68M95N0 - Western Digital Red Pro NAS 10TB 7200RPM SATA 6Gb/s 256MB Cache 3.5-inch Hard Drive
SKU: WD102KFBX-68M95N0
Price: $712.64
WD102KFBX - Western Digital Red Pro NAS 10TB 7200RPM SATA 6Gb/s 256MB Cache 3.5-inch Hard Drive
SKU: WD102KFBX
Price: $712.64
WD101KFBX - Western Digital Red Pro NAS 10TB 7200RPM SATA 6Gb/s 256MB Cache 3.5-inch Hard Drive
SKU: WD101KFBX
Price: $732.43
WD121KFBX-68EF5N0 - Western Digital Red Pro NAS 12TB 7200RPM SATA 6Gb/s 256MB Cache 3.5-inch Internal Hard Drive
SKU: WD121KFBX-68EF5N0
Price: $752.24
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.