2. Fixed Hard Disk
• Used to store the
operating system and
applications software.
• Typical storage spaces
are 250 gigabytes.
3. Advantages and disadvantages
Advantages:
Very easy to update and delete files.
Huge capacities.
Fast read/write times.
Disadvantages:
Not portable as they are designed to be fixed.
Can be damaged easily.
4. Portable hard disk
• Used to transfer data , files and
software.
• Typical storage spaces up to 250
gigabytes.
5. Advantages and disadvantages
Advantages:
Fast read/write times.
Huge capacities
Small and light.
Disadvantages:
More expensive.
Small size makes them easy to misplace or have stolen.
If the device is dropped it can still become damaged.
6. Floppy disk
• Can still be used
where very small
files need to be
transferred/stored.
• Storage: 1.44MB
7. Advantages and disadvantages
Advantages:
Cost very little to buy.
Can be write protected easily.
Very small , light and easy to carry.
Disadvantages
Very low storage capacity
Very few modern computers have floppy disc drives
Slow data transfer rate.
8. Magnetic
• Used when extremely
large amounts of data
need to be backed up.
• Storage: 185TB
9. Advantages and disadvantages
Advantages:
Less expensive
Very robust
Very large storage capacities
Disadvantages:
Very slow
Needs another tape to update data.