Full disk encryption (FDE) vs Self encryption disk (SED)

 In full disk encryption full disks are getting encrypted. Several disk are available to do this operation .

• Veracrypt is a opensource application to encrypt the entire disk.

Many vendors makes hardware based on FDE drives. These are sometimes referred as self encrypting drives (SED).

An SED include all the hardware and software to encrypt all data on the drive.

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BIOS vs UEFI

 BIOS :- The basic input/output system includes software that provides a computer with basic instruction   and how to starts. The BIOS is often referred as firmware. It is a hardware chip and a software that           executes codes on computer. The combination of hardware and software is firmware.

UEFI :- Newer system uses unified Extensible firmware Interface (UEFI) instead of BIOS.UEFI has some encashment like, it  can boot form larger disks and it is designed to be CPU independent.