With 8,000 GB of storage, this is a good HDD drive if you need a larger storage unit. This model has a 3.5" form factor.
From Amazon
WD Blue 8TB 3.5" Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, 256MB Cache, 2 Year Warranty
Overclockers
WD 8TB Blue HDD 5640rpm 256MB Cache Internal Hard Drive (WD80EAAZ)