Secondary Memory : Secondary Memory or Secondary Storage is
the static memory capable of storing large amount of data without losing with
time or when powered off. Secondary memory or Secondary storage that is
non-volatile is not accessed by CPU directly. It is generally cost effective as
compared to Primary Memory. Below mentioned are some commonly/generally/officially
available forms of Secondary Memory :
1.
Flash
Memory, 2. Optical Discs 3. Magnetic Disks and 4. Magnetic Tape
- Flash Memory : This is the most recent form of storage device added to the secondary storage devices. This is static form of memory storage supporting read, write, update, delete at comparatively fast speed and are very compact in size. Flash Drives, Memory cards etc. are the examples of this type of storage devices.
- Optical Disc : The data is read and written with the help of lasers on this type of storage device forms. This form of storage devices are capable of storing data many times more than previously available compact and portable magnetic storage forms. Example of this form of memory storage devices is CD-ROM etc.
- Magnetic Disk : Magnetic disc is generally of circular shape magnetisable material capable of holding the charge on both sides. Examples of Magnetic disks are : Hard disk, floppy disk etc.
