This SSD hard drive has a 4,000 GB storage capacity and works faster than an HDD drive. The form factor is 2.5", which is standard for SSD drives.
From Amazon
Transcend 4TB SATA III 6Gb/s interne 2.5” SSD (HDD) für Aufrüstung von Desktop-PCs, Laptops, Notebooks und Spielekonsolen TS4TSSD230S
Conrad Electronic
Transcend 230S 4 TB 2.5 (6.35 cm) internal SSD SATA 6 Gbps Retail TS4TSSD230S