HP P09685-B21 240GB is an SSD type hard drive which can fit 240 GB of data. This model has a 2.5" form factor.
From OnBuy
240GB SATA RI SFF RW DS SSD
Clove Technology
Hewlett Packard Enterprise P09685-B21 internal solid state drive 2.5" 240 GB Serial ATA III MLC
Athema Services
hp 240gb sata ri sff rw ds ssd **shipping new sealed spare** p09685-b2