This document discusses various types of computer storage technologies including primary storage like RAM and secondary storage like hard disks, solid state drives, optical discs, tape storage, cloud storage, and enterprise storage systems. It provides details on the components and workings of hard disks, compares different optical disc formats, and explains concepts like RAID configurations, storage area networks, and cloud storage services.

1. ‫وووو‬ ‫وووو‬ ‫وو‬‫سسسسسسس‬ ‫سسسسسسس‬‫سسسسسسس‬ ‫سسسسسسس‬
‫سسسس‬ ‫سسسس‬‫سسسس‬ ‫سسسس‬

2. ‫سسسسس‬ ‫سسسس‬ .‫س‬ ‫سسسسسسسس‬ ‫سسسسسسس‬ ‫سسسس‬ISBN: 978-9933-13-286-6‫سسسسسس‬ ‫سسسس‬ ‫سسسسسسسس‬ ‫سسسسس‬ ‫سسسس‬ ‫سسس‬ ‫س‬2017.
2

3. Secondary Storage
3

4. RAID
Blu-ray.
USB.
.

5. 
RAM
primary storage.

Secondary storage

writing:
reading:
secondary storage device
5
Storage

6. 
Media

Capacity

Storage devices

Access speed
6

7. 


7
Hard Disks

8. platter





8
Hard Disks

9. 01.

bits
pixel.
8Byte


9
Hard Disks

10. blocks

ASCIIEBCDICUnicode.
A8.
Density
10
Hard Disks
A

11. 
Tracks
sectors.
cylinder.
11
Hard Disks

12. .0 000001
head crash.

GIGABYTETerabyte

Seek Time
1020ms.(
12
Hard Disks

13. )1
)0.
Binary digit systemByte.

Bit0,1
Hard Disk.
RAM.

13
Hard Disks

14. 8bits = 1 Byte
1024Bytes = 1 Kilobyte (KB)
, ,1 048 576Bytes = 1 Megabyte (MB)
, , ,1 043 741 824Bytes = 1 Gigabyte (GB)
, , , ,1 099 511 627 776Bytes = 1 Terabyte
(TB)
14

15. .
.
.
.


15
Internal Hard Disk

16. 
.
USB
.
16
External Hard Drives



17. Disk caching





30
17
Performance Enhancements

18. )RAID) Redundant arrays of inexpensive
disks





RAID.
18
Performance Enhancements

19. File compression and file decompression

DVDCD.


WinZip.
19
Performance Enhancements

20. .
SSD) Solid-state drives

.
.
SSD
20
Solid-State Storage

21. USB Drives
USB
GB 1GB 500

Flash Memory Cards
.
.
.
21
Solid-State Storage

22. GB500.





.
22
Optical Discs

23. Compact discs (CDs)
Digital versatile discs (DVDs)
BDS) Blu-ray discs
GB 50
Read-only (ROM for read-only memory) discs
Write-once (R for recordable) discs.
Rewritable (RW for rewritable or RAM for random-access
memory) discs
.
23
Optical Discs

24. 24
Optical Discs
‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬Description
‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬
Typical Capacity
‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬‫ف‬
Format
700 MB CD
4.7 GB DVD
50 GB
Blu-ray

25. 


25
Cloud Storage

26. Maintenance-
Hardware upgrades
File sharing and collaboration
Access speed
File security
26
Cloud Storage

27. Mass storage.
Mass storage devices.

27
Mass Storage Devices

28. enterprise storage system.


File servers
Network attached storage (NAS(.
)RAID) Redundant arrays of inexpensive disks
Organizational cloud storage
28
Enterprise Storage System

29. remotedisk arraysTape librariesRAIDoptical storages(
ServersLocally attached.
SAN
SAN

SAN
29
Storage Area Network (SAN)

30. 30
Storage Area Network (SAN)

31. 


Multiple-choice.

Matching.




31

32. 




32