Western Digital, HDD WD Red Plus WD40EFZZ 4TB/8.9/600 Sata III 128MB (D) (CMR

• NAS & RAID optimized: WD Red Plus is specifically designed for NAS enclosures with up to 8 drive bays — ideal if you're running a small to medium NAS or building a RAID system.
• Reliability & Continuous Operation: Thanks to NASware firmware and rugged design, it is designed for continuous operation (24/7) — important for NAS servers that run constantly.
• Compatibility & Energy Efficiency: WD promotes extensive compatibility testing for many NAS systems, and the disk is designed to run energy efficiently and generate less heat — benefits for multi-plate closed NAS enclosures.
• Performance for home/SMB/power users: It is well suited for home offices, small businesses or users who use NAS as multimedia servers, backup solutions or shared storage.
• NOTES: This disk is not designed like a typical desktop HDD — it is optimized for NAS/RAID and continuous operation. Desktop drives could be less reliable in NAS environments. Make sure your NAS enclosure or NAS system is compatible with SATA 6 Gbps and 3.5" hard drives. Although it is not a top speed monster at 5400rpm, it offers great value for NAS purposes with 4TB and 180MB/s transfer rate.

The WD Red Plus WD40EFZZ is an internal 3.5-inch HDD with 4TB capacity, intended for use in network attached storage (NAS) systems, i.e. home or corporate network storage. It is part of the Western Digital WD Red Plus product line — specifically designed for small and medium business NAS environments or demanding home NAS. This HDD is optimized for continuous operation and is especially aimed at users who want to store, backup or share large amounts of data on the net—such as media libraries, backups or shared data pools.

UK Delivery:

• Free delivery on all orders of £10 or more.
• £1.49 delivery fee on orders below £10.
• UK orders are shipped via Royal Mail 2nd Class.

International Delivery:

• Flat rate delivery charges vary by country.

Dispatch and Delivery Times:

• All orders are shipped from our warehouse in Northampton, UK within 48 hours of receipt during working hours.
• UK mainland orders typically arrive within 3-5 working days via Royal Mail 2nd Class.
• International estimated delivery times:
• Europe & Channel Islands: 7 to 10 working days
• USA: 7 to 15 working days
• Rest of the World: 9 to 21 working days

View our full delivery infomation here.