Capacity 3 TB Interface SATA Transfer Rate up to 180MB/s Form Factor 3.5 in Cache Size 256 MB Disk Speed (RPM) 5400rpm Compatibility WD Red NAS Hard Drives are designed specifically for NAS systems that have 1 to 8 drive bays in both 3.5-inch and 2.5-inch form factors.
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This is an approximate conversion table to help you find your size.