The Power of One. Barracuda Desktop HDD :4TB5900Rpm64Mo CacheSATA 6Gb/s, SAS 6Gb/s Specifications : Form Factor 3.5" Interface Options SATA 6Gb/s, SAS 6Gb/s Performance 5900 Spindle Speed (RPM) Cache (MB) 64 Transfer Rate, Max Ext (MB/s) 600 Sustained Data Rate OD 180 MB/s Average Data Rate, Read/Write (MB/s) 146 Dimensions 10.2 x 14.7 x 2.6 mm Weight (g) Approx. 610g Warranty 3 years