3813430 120GB is an SSD type hard drive which can fit 120 GB of data. The form factor is 2.5" which is standard for SSD drives.
From OnBuy
Hard Drive INTENSO 3813430 2.5" SSD 120 GB 7 mm Sata III
The product is available from £10.52 at international stores.
Conrad Electronic
Intenso High Performance 120 GB 2.5 (6.35 cm) internal SSD SATA 6 Gbps Retail 3813430