Grab one of this Seagate FireCuda 1TB internal hard drive. It's the fastest 2.5" hard drive that complies with computing and gaming. Adaptive Memory technology identifies frequently accessed data which improves boot times of those identified files and makes the life of the drive even longer and makes the drive draw less power.
The ST1000LX015 hard drive from Seagate features 1TB of storage size in a 2.5" form factor. This drive connects to your system via the SATA 6 Gb/s interface so make sure you have an available port on your compatible motherboard. Advanced features of this HDD include a N/A cache/buffer and 5400 rotational spin rate.