Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD – 5400 RPM, SATA 6 Gb/s, 64 MB Cache, 3.5″ – WD40PURZ

• 4TB Storage Capacity
• 3.5″ Form Factor
• SATA III 6 Gb/s Interface
• 64MB Cache
• 5400 rpm Rotational Speed
• 300,000 Load/Unload Cycles
• Surveillance Class Storage
• Supports 64 HD Surveillance Cameras
• 1 Million Hours MTBF
• Windows and Mac Compatible

The 4TB Purple 5400 rpm SATA III 3.5″ Internal Surveillance HDD Retail Kit from Western Digital is a 3.5″ SATA drive with a data transfer rate of 6 Gb/s that is designed to withstand the stresses placed on it in a 24/7 surveillance system. With support for up to 64 high-definition surveillance cameras, this 4TB hard drive can hold a large amount of data and gives you the ability to easily upgrade and expand your security system.

A 64MB cache helps to ensure uninterrupted data transfers and the drive’s 300,000 load/unload cycles, combined with its 1 million hours MTBF helps ensure the drive will have a strong operational life. This drive is compatible with both Windows and Macintosh operating systems and includes mounting screws.