This is an SSD drive with a 960 GB storage capacity. The form factor is 2.5" which is standard for SSD drives.
From Quzo
960G Ssdnow Dc500m 2.5In Ssd
EE Store
Kingston 960GB DC500M 2.5 SATA 6Gb/s SSD
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Kingston 960GB DC500M SSD 2.5 Inch 7mm, SATA 3.0 (6Gb/s), 555MB/s R, 520MB/s W