1. Backing up of data
1.1. is
1.1.1. Refers to the copying of files/data to a different medium (Disk, tape, flash drive, etc.) in case of a problem with the main secondary storage device.
1.1.1.1. why?
1.1.1.1.1. To safeguard against loss of data due to the failure of the original secondary storage device
1.1.1.1.2. To safeguard against damage caused by hackers.
1.1.1.1.3. In the case the files need to be used elsewhere. This protects the originals against possible corruption or loss.
2. Primary storage
2.1. is
2.1.1. Is the storage provided by memory in a computer system.
2.1.1.1. could be
2.1.1.1.1. RAM
2.1.1.1.2. ROM
3. Types of Access
3.1. Serial Access
3.1.1. is
3.1.1.1. It is primarily used in magnetic tape systems and is a very slow form of data Access
3.2. Direct Access
3.2.1. is
3.2.1.1. Is used with magnetic disks, optical media and solid state media. It is used in applications where data Access speed is vital
4. Secondary storage media.
4.1. is
4.1.1. Is storage provided by peripheral devices other than memory
4.2. can be
4.2.1. Magnetic
4.2.1.1. is
4.2.1.1.1. HDD
4.2.1.1.2. Portable hard disk drives
4.2.1.1.3. Magnetic tapes
4.2.2. Optical
4.2.2.1. is
4.2.2.1.1. Laser light is used to read data and to write data on the Surface of a disk
4.2.3. Solid state
4.2.3.1. is
4.2.3.1.1. SSD
4.2.3.1.2. Pen drives
4.2.3.1.3. Flash memory cards
4.3. measures in
4.3.1. KB: Kilobyte
4.3.2. MB: Megabyte
4.3.3. GB: Gigabyte
4.3.4. TB: Terabyte