This hard drive from Dell has room for 2,400 GB of data. People tend to have very specific needs when buying computer compontents, but this could potentially work well for you.
From Quzo
DELL 400-AVHE internal hard drive 2.5" 2.4 TB SAS
Clove Technology
DELL 400-AVHE internal hard drive 2.5" 2400 GB SAS
Compadvance
DELL Hard Drive Encrypted 2.4