DISK CACHING
It is a small amount of memory present on a hard drive used to cache reads and writers to the hard disk,and it is the most important type of cache on the PC.

FILE COMPRESSION
Is commonly used when sending a file from one computer to another over a connection that has limited band with. it makes the file smaller and therefor the sending of the file is faster.


FILE DECOMPRESSION
Is when you use tools to make a file  takes up less space

INTERNET HARD DRIVE
Offers a mean of accessing your computer files ( pictures, documents, music, videos) from any computer as long as that computer has access to the internet.


OPTICAL DISK DRIVE
Is a disk drive that uses laser light or electromagnetic waves near the light spectrum as part of the process of reading or writing data.


SOLID STATE STORAGE
Is a data storage device that uses solid state memory to store persistent data with the intention of providing access in the same manner as a hard disk drive