This is a mechanical HDD drive with a 2 TB storage capacity. The form factor of this hard drive is 2.5".
From Amazon
Transcend 2TB StoreJet 25M3 USB 3.1 Portable Hard Drive Rugged, Anti-Shock Resistant, Compact and Lightweight with Lightning-Fast Speeds and a One Touch Backup Button (Iron Grey) TS2TSJ25M3
CCL Computers AMD
Transcend StoreJet 25M3 2TB Mobile External Hard Drive in Grey
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