








🔴 Power Your NAS with Reliability & Capacity That Never Sleeps
The WD Red 4TB NAS Internal Hard Drive (WD40EFAX) is purpose-built for NAS systems up to 8 bays, delivering 4TB of reliable storage at 5400 RPM. With NASware firmware and a robust 180 TB/year workload rating, it’s optimized for continuous 24/7 operation in small and home office environments. Energy-efficient and backed by a 3-year warranty, it’s the trusted choice for professionals demanding dependable, high-capacity NAS storage.







| Brand | Western Digital |
| Product Dimensions | 2.62 x 14.71 x 10.16 cm; 560 g |
| Item model number | WD40EFAX |
| Manufacturer | Western Digital |
| Series | DISQUE DUR WD RED 4TO 64MO CACHE SATAIII *WD40EFAX* (NAS STORAGE) 1036 |
| Colour | Red |
| Form Factor | 2.5 in3.5 in |
| Standing screen display size | 24 Inches |
| Hard Drive Size | 4 TB |
| Hard Disk Description | Mechanical Hard Disk |
| Hard Drive Interface | eSATA |
| Wattage | 4.8 watts |
| Hardware Platform | Mac, PC |
| Are Batteries Included | No |
| Lithium Battery Energy Content | 2 Kilowatt Hours |
| Lithium Battery Packaging | Batteries packed with equipment |
| Lithium Battery Weight | 2 Grams |
| Number Of Lithium Ion Cells | 5 |
| Number of Lithium Metal Cells | 5 |
| Item Weight | 560 g |
| Guaranteed software updates until | unknown |
Trustpilot
4 days ago
3 weeks ago