HP 875681-001 480GB is an SSD type hard drive which can fit 480 GB of data. The form factor is 2.5".
From SmartTeck
HPE 875681-001 internal solid state drive 2.5" 480 GB SAS -
Clove Technology
HPE 875681-001 internal solid state drive 2.5" 480 GB SAS
Athema Services
hp 480gb sas 12g sff ds sc ssd 875681-001, 480 gb, 2.5", 12 875681-00
Compadvance
HP 480Gb Sas 12G