SSDNow A400 SA400M8 480GB is an SSD type hard drive which can fit 480 GB of data. This model has an M.2 form factor.
From Amazon
Kingston A400 SSD Internal Solid State Drive M.2 2280 SATA Rev 3.0, 480GB - SA400M8/4800G
EE Store
Kingston A400 480GB M.2 2280 SSD
OnBuy
Kingston Technology A400 M.2 480 GB Serial ATA III 3D NAND