Secondary storage can be divided into: (1) magnetic medium; (2) optical medium; & (3) flash memory.
Magnetic Medium:
It is a non-volatile. It can be any type of storage medium that utilizes magnetic patterns to represent information. The devices use disks that are coated with magnetically sensitive material. The examples of magnetic storage are:
(a) magnetic disk such as: (1) a floppy disk, used for off-line storage; (2) hard disk, used for secondary storage.
(b) magnetic tape; including video cassette, audio storage reel-to-reel tape & others.
Optical Medium:
It is a non-volatile storage that holds content in digital form that are written and read by a laser. These media include various types of CDs and DVDs.
These following forms are often commonly used:
(a) CD, CD-ROM, and DVD: Read only storage, used for distribution of digital information such as music, video and computer programs.
(b) CD-R: Write once storage, the data cannot be erased or written over once it is saved.
(c) CD-RW, DVD-RW, and DVD-RAM: Slow to write but fast reading storage; it allows data that have been saved to be erased and rewritten.
The disk capacity is more compared to magnetic media. Durability is another feature of optical media. They are able to last for up to seven times as long as traditional storage media.
Flash Memory:
It is a solid-state, non-volatile, rewritable memory that functions like RAM and a hard disk drive combined. Flash memory store bits of electronic data in memory cells just like DRAM. It works like a hard disk drive that when the power is turned off, the data remains in the memory. Flash memory cards & flash memory sticks are examples of flash memory.
Flash memory cards are also used with digital cellular phones, MP3 players, digital video cameras and other portable digital devices.
Flash memory is also called USB drives, thumb drives, pen drives or flash drives. The advantages: it offers fast reading access times, durable & requires low voltage. It is light & small.
It is a non-volatile. It can be any type of storage medium that utilizes magnetic patterns to represent information. The devices use disks that are coated with magnetically sensitive material. The examples of magnetic storage are:
(a) magnetic disk such as: (1) a floppy disk, used for off-line storage; (2) hard disk, used for secondary storage.
(b) magnetic tape; including video cassette, audio storage reel-to-reel tape & others.
Optical Medium:
It is a non-volatile storage that holds content in digital form that are written and read by a laser. These media include various types of CDs and DVDs.
These following forms are often commonly used:
(a) CD, CD-ROM, and DVD: Read only storage, used for distribution of digital information such as music, video and computer programs.
(b) CD-R: Write once storage, the data cannot be erased or written over once it is saved.
(c) CD-RW, DVD-RW, and DVD-RAM: Slow to write but fast reading storage; it allows data that have been saved to be erased and rewritten.
The disk capacity is more compared to magnetic media. Durability is another feature of optical media. They are able to last for up to seven times as long as traditional storage media.
Flash Memory:
It is a solid-state, non-volatile, rewritable memory that functions like RAM and a hard disk drive combined. Flash memory store bits of electronic data in memory cells just like DRAM. It works like a hard disk drive that when the power is turned off, the data remains in the memory. Flash memory cards & flash memory sticks are examples of flash memory.
Flash memory cards are also used with digital cellular phones, MP3 players, digital video cameras and other portable digital devices.
Flash memory is also called USB drives, thumb drives, pen drives or flash drives. The advantages: it offers fast reading access times, durable & requires low voltage. It is light & small.
The disadvantage: it is more expensive than the magnetic disk of the same capacity.
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