IronWolf 125 ZA500NM1A002SSD 500GB is an SSD type hard drive which can fit 500 GB of data. The form factor of this SSD is 2.5".
From Ecprof
ZA500NM1A002 - IRONWOLF 125 SSD 500GB RETAIL
Clove Technology
Seagate IronWolf 125 2.5" 500 GB Serial ATA III 3D TLC