Replacement for WD40EMRX: Drop-In Alternatives We Stock
Looking for a replacement for the WD40EMRX (WD40EMRX - Western Digital 4TB 5400PRM SATA 6Gb/s 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 WD40EMRX
| SKU | WD40EMRX |
|---|---|
| Product | WD40EMRX - Western Digital 4TB 5400PRM SATA 6Gb/s 3.5-inch Hard Drive |
| Current price | $259.50 |
| Stock status | In Stock |
| Detail page | View WD40EMRX › |
Drop-in replacements for WD40EMRX
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.
Western WD4005FFBX Western Digital WD4005FFBX Red Pro 4TB 7200RPM SATA 6Gb/s 256MB Cache 3.5-Inch Hard Drive
SKU: WD4005FFBX
Price: $284.21
Western WD4006FZBX Western Digital WD4006FZBX Black 4TB 7200RPM 6Gb/s SATA 256MB Cache 3.5-Inch Hard Drive
SKU: WD4006FZBX
Price: $366.32
Western WDS400T3B0A-00C7K0 Western Digital WDS400T3B0A-00C7K0 4TB SATA 6Gb/s 2.5-Inch Solid State Drive
SKU: WDS400T3B0A-00C7K0
Price: $1,854.74
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 WDS400T3B0A Western Digital WDS400T3B0A Blue SA510 4TB Triple-Level Cell 6Gb/s SATA SFF 2.5-Inch Solid State Drive
SKU: WDS400T3B0A
Price: $2,155.79
WD40E31X - Western Digital Blue 4TB 5400RPM Multi-Level-Cell SATA 6Gb/s 64MB Cache 8GB NAND Solid State Drive 3.5-inch Hybrid Hard Drive
SKU: WD40E31X
Price: $1,004.46
WD42PURZ - Western Digital Purple 4TB CMR SATA 6Gb/s 256MB Cache 3.5-inch Surveillance Hard Drive
SKU: WD42PURZ
Price: $150.32
WD4001FFSX - Western Digital Red Pro 4TB 7200RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: WD4001FFSX
Price: $210.53
WD40PURZ - Western Digital Purple 4TB 5400RPM SATA 6Gb/s 64MB Cache 3.5-inch Surveillance Hard Drive
SKU: WD40PURZ
Price: $221.05
WD4003FZEX - Western Digital Black 4TB 7200RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: WD4003FZEX
Price: $233.68
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.