1. Secondary Storage
Thin, rigid covered with a substance that allows data to be held in the form of
The more there are, the higher the
Store data in
Data read by
Formatting creates a that maps to
ride on ” cushion of air, and can crash!
Important data should always be backed up!
Cheap, but many moving parts

2. Secondary Storage Types: External – a freestanding
Removable – inserted into a cartridge drive on the PC
Circuitry which allows the to communicate with the
EIDE – Enhanced Integrated Drive Electronics
Marketed as SATA, Fast ATA, Ultra ATA, ATA-2, ATA/100
SCSI – Faster than EIDE controllers

3. Storage -style disk with extremely high capacity
Data is written and read using
Data stored in the form of and
– Read Only Memory
- recording only once
– erasable, can record and erase data repeatedly
-style disk with extremely high capacity
Can store more and , and store in
Stores 4.7 or more GB
is used for recording only once
are reusable
can read , but not always vice versa
– next generation - 25 gigabytes

4. Memory memory with no But the electronics can Available as
Insert these into a of a camera, handheld PC, smartphone
A form that plugs into a
A finger-sized module of
Plugs into the of most PCs and Macintoshes

5. The System Unit: The Basics