This is an SSD drive with a 4 TB storage capacity. This model has a 2.5" form factor, which is common for SSD drives.
From SmartTeck
HPE R3R30A internal solid state drive 2.5" 3.84 TB SAS -
Athema Services
hpe msa 3.84tb sas ri sff m2 ssd r3r30a - wc01