 "WD Purple WD10PURX 1TB Surveillance 3.5" Internal SATA Hard Drive"
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                Overview:
The 1TB Purple Surveillance Internal Hard Drive from Western Digital is designed to withstand the stresses placed on it in a 24/7 surveillance system. With support for up to 32 high-definition surveillance cameras this 1TB hard drive can hold a large amount of data and gives you the ability to easily upgrade and expand your security system.

Built for always-on surveillance storage applications
AllFrame technology for reduced pixilation and video interruption
Designed to support up to 32 HD cameras
Caching algorithms specifically designed for security surveillance operation
1 TB capacity holds up to 200,000 digital photos, 250,000 MP3 files, and 120 hours of HD video.

Specifications:

1TB Storage Capacity
3.5 Form Factor
6 Gb/s Data Transfer Rate
64MB Cache
Surveillance Class Storage
Supports up to 32HD Surveillance Cameras

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 "Western Digital 1TB Purple SATA GB/S 5400 RPM 64MB 3.5""@en " Western 3.5": WD10PURZ "@en
   Specifications: Storage Capacity 1 TB Drive Interface SATA Drive Interface Standard SATA/600 Spindle Speed (rpm) 5400 Buffer 64 MB Wireless LAN No Drive Type Internal Drive Width 3.5" Dimensions 1" x 4" x 5.8"