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3. Primary Memory Secondary Memory

5. Introduce by IBM in 1956
Still used today.
Magnetic Disk
5,400 RPM 7,200 RPM 10,000 RPM
Typically used in
desktops.
Typically used in
laptops.
High-end hard
drive

6. Data travels in a
serial path,
which means
data travel one
bit at a time
Sata drives have
transfer speeds
of 6 Gbits/s

8. SSD have no Moving Parts.
Use Flash Memory chips to
store data.
Data Transfer is very Fast
M.2
NVME – Non Volatile Memory Express

10. 500 GB. Contain
data that would
frequently access.
2 TB. Contain data that
would infrequently
access.

11. 100TB. But it is
expensive

12. SSHD – Solid State Hybrid
Drive
Combine the uses of
magnetic disk and flash
memory
Store large data or
infrequently use data
Store data for frequently
use
The firmware in the drive
will learn and decide by
itself, where to store the
data.

14. Defragment
Defragmentation reduces the amount of fragmented files on a
hard drive
It reorganizes related data files and puts them in the same
physical location

15. Data is divided into multiple chunks of data that are stored on the
hard drive.

17. RAID
Storage is another very important part of fault tolerance
• No data loss prevention
• RAID – Redundant Array of independent Disk
Types of Raid
• Raid 0
• Raid 1
• Raid 5
• Raid 10

18. • Not Fault tolerance

19. • Is fault tolerance