This is an SSD drive with a 1 TB storage capacity. This model has a 2.5" form factor, the most common for SSD drives.
From OnBuy
Transcend SSD230S 1024 GB Serial ATA III 2.5"
Conrad Electronic
Transcend 230S 1 TB 2.5 (6.35 cm) internal SSD SATA 6 Gbps Retail TS1TSSD230S