This hard drive from Transcend has room for 1 TB of data. The form factor of this hard drive is 2.5".
From Amazon
Transcend 1 TB USB Type-C, 3.1 Gen 1 Portable Hard Drive - StoreJet TS1TSJ25C3S
Compadvance
TRANSCEND ^1Tb Storejet2.5
OnBuy.com
Transcend StoreJet 25C3S 1TB 2,5 USB 3.1 Gen 1