You can use software based encryption under Windows or Linux/UNIX computer. This is useful if you lost your hard disk or entire laptop is stolen.
Seagate debuts the world’s most secure laptop drive called Momentus 5400 FDE.2 drive with native 128-bit AES encryption. The main benefit is you will save CPU power / cycle as drive use firmware based encryption at the laptop drive level.
This is a standard ATA drive that’s encrypting all the time. It acts like a regular drive, you wouldn’t know the difference.
The Momentus is a serial ATA drive that spins at 5,400 rpm, has a 1.5Gbit/sec throughput and comes with pre-boot authentication and a secure data erasure feature, which overwrites data several times to allow repurposing of the drive. The drive comes in 80GB, 120GB and 160GB capacities. The encryption feature will add about 25% more to the cost of standard Seagate SATA drives and will retail anywhere $130 to $175 for an 80GB drive