The HDD is a Hybrid hard drive found on PCs, and it is located in the drive bay, which is connected to the motherboard of PCs via an Advanced Technology Attachment. The primary function of the HHD is to keep stored data while the PC is powered down. While the SSD or Solid State Drive is a non-volatile type of storage device found in PCs, the SSD replaces the HDD traditional drive; though it performs the exact basic function, it is faster when compared to the traditional hard disk drive.