This Is The World’s Largest Hard Disk Drive (HDD). Seagate launched the Exos 20+ hard disk drive (HDD) in December 2020. The HDD utilises HAMR and MACH2 technologies to offer 20 terabytes (TB) of storage. Typically, home computers utilise hard drives ranging from 1TB to 4 TB. Businesses and data centres may use significantly larger hard drives. It’s an impressive development from Seagate. The company recently launched 18TB hard drives to the market as well. Lately, companies have released larger and larger hard drives with improved performance. Solid state drives (SSDs) continue to grow in popularity, but the HDD remains a competitive alternative, especially for larger capacities.