MPN WD84PURZ Capacity 8 TB Cache Size 128 MB Interface SATA Form Factor 3.5 Inch Disk Speed (RPM) 5640rpm Compatibility WD PurpleTM surveillance storage is built to handle up to 64 cameras per drive and is designed for 24/7, always on, high-definition surveillance security systems with more than eight bays.
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This is an approximate conversion table to help you find your size.