An internal hard drive is built into the computer, while an external hard drive is connected to the computer via an external port (e.g. USB or Firewire).
The Solid State Drive (SSD) is a flash memory and normally smaller in size and storage (GB) in comparison to the Hard Disc Drive (HDD). A hybrid is a combination of a SSD and a HDD.
The physical size of the disk.
|Hard Drive Size
The amount of data that you can store in your drive, the size of the hard drive is measured in gigabytes (GB).
If the unit is powered by the USB-port alone, which is common for portable external hard drives.