EASYSAFETY

RM 150SEN 10

SEN

2020SENSEN

EASYSAFETY

SECONDARY STORAGE

• (or called storage media) is a physical

material on which a computer keeps data,

instructions and information

Examples of storage media: Floppy Disks, Hard Disk, CDs DVDs and USB

Flash Drives.

STORAGE DEVICE• is the computer hardware that records and

retrieves item to and from storage media.

Writing is the process of transferring data,

instructions and information from memory to

a storage medium.

Reading is the process of transferring these

item from a storage medium into memory.

Capacity is the number of byte

(characters) a storage medium can hold.

For example, a typical floppy disk can store up

to 1.44 MB of data and typical hard disk has 80

GB of storage capacity.

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TERMS

Transfer rate is the speed with which data,

instructions, and information transfer to and

from a device.

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Access time measure the amount of time

to locate an item on a storage medium and a

mount of time to deliver an item from memory

to the processor.

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CHARACTERISTICS Of Secondary Storage

2. Bigger Capacity

3. Slower Speed

1. Non-volatile

4. Less Expensive

ACTIVITY 1

Please form 4 group consist of 3 or 4 persons

Discuss the difference of secondary storage

and primary storage

TYPES OF SECONDARY STORAGE

1. Magnetic Disks

2. Optical Disks

3. Flash Memory

Non-Volatile

Meaning

- Item on a storage medium remain

intact even when power is removed

from the computer.

Bigger Capacity

- Storage medium is practical for all

storage requirement.

- They have big capacity than memory.

Slower Speed

- The access time of storage device is

slow compare to memory.

- Secondary storage has slower transfer

rates.

- Memory access item in nanoseconds,

storage device access items in

milliseconds.

Less Expensive

- Secondary storage is relatively less

expensive than memory.

- Secondary storage is less expensive but

slower than memory, memory is faster

than storage but expensive.