for 8th graders of the pioneer iddle school of sfax pupils

1. Other Data StorageOther Data Storage
devicesdevices
88thth
Level – Added PartLevel – Added Part

2. Time lineTime line
1951 1956 1969 1988 1995 2000 20061994

3. Magnetic tapesMagnetic tapes
Magnetic tape was first used to record computer data in 1951 on the
Eckert-Mauchly UNIVAC I compagny.
The highest capacity tape media are generally on the same order as the
largest available disk drives (about 1 TB in 2007).

4. Some magnetic tapesSome magnetic tapes
From left to right: DDS-4 tape (20 GB), 112m Data8 tape (2.5 GB), QIC DC-6250
tape (250 MB), and a 3.5" floppy disk (1.44 MB).

5. Hard DiskHard Disk
 Invented byInvented by IBMIBM in 1954 and introduced inin 1954 and introduced in
computers incomputers in 19561956..

6. TechnologyTechnology

7. Six hard drives with 8″, 5.25″,Six hard drives with 8″, 5.25″,
3.5″3.5″,, 2.5″2.5″, 1.8″ and 1″ disks, 1.8″ and 1″ disks

8. External hard diskExternal hard disk

9. Floppy Disks:Floppy Disks:
Invented by IBM,
•1969 (1971):
floppy disks in 8-inch
(200 mm),
•1976:
5¼-inch (133.35 mm),
•1982:
3½-inch (90 mm).
Was the most popular storage device from the mid-1970s to the late 1990s

10. 8-inch, 5¼-inch and 3½-inch8-inch, 5¼-inch and 3½-inch
Floppy disk drivesFloppy disk drives

11. Floppy Disk Drive 8 inchFloppy Disk Drive 8 inch

12. Some Disk formats and their capacitiesSome Disk formats and their capacities
Floppy Disk formatFloppy Disk format Year introducedYear introduced capacitycapacity
8-inch - IBM8-inch - IBM 19711971 80 KB80 KB
8-inch Memorex8-inch Memorex 19721972 175 KB175 KB
8-inch - IBM8-inch - IBM 19771977 1.2 MB1.2 MB
5¼-inch Shugart5¼-inch Shugart 19761976 90 KB90 KB
5¼-inch Apple5¼-inch Apple 19801980 140 KB140 KB
5¼-inch HD5¼-inch HD 19821982 1.2 MB1.2 MB
3½-inch - HP3½-inch - HP 19821982 280 KB280 KB
3-inch DD3-inch DD 19841984 720 KB720 KB
3½-inch HD3½-inch HD 19871987 1.44 MB1.44 MB
3½-inch ED3½-inch ED 19871987 2.88 MB …2.88 MB …

13. If you have no Floppy diskIf you have no Floppy disk
drivedrive
=> use=> use Usb floppy diskUsb floppy disk
drivedrive

14. Floppy disk -> SavingFloppy disk -> Saving
iconicon

15. The Zip disk mediaThe Zip disk media
 The Zip drive is a medium-capacity removable diskThe Zip drive is a medium-capacity removable disk
storage system, introduced by Iomega in latestorage system, introduced by Iomega in late 1994.1994.
- Zip 100 MB
- Zip 250 MB
- Zip 750 MB

16. CD-RCD-R
A CD-R (Compact Disc-Recordable) is a variation of the
Compact Disc invented by Philips and Sony in 1988.

17. CDs CapacitiesCDs Capacities
Physical size
Audio
Capacity
CD-ROM Data
Capacity
Note
12 cm 74–99 min 650–870 MB Standard size
8 cm 21–24 min 185–210 MB Mini-CD size

18. SpeedSpeed
Drive speed Data rate Write time for 80 minute/700 MB CD-R
1X 150 KB/s 80 minutes
4X 600 KB/s 20 minutes
8X 1200 KB/s 10 minutes
12X 1800 KB/s 6.7 minutes
32X 4800 KB/s 2.5 minutes
52X 7800 KB/s 1.5 minutes

19. PackagingPackaging

20.  DVD founded inDVD founded in 19951995 by many companies.by many companies.
Its main uses areIts main uses are videovideo andand datadata storage.storage.

21. DVDs CapacitiesDVDs Capacities
Designation Sides Layers
Total
Diameter Capacity
(cm) (GB) (GiB)
DVD-1 SS SL 1 1 8 1.46 1.36
DVD-2 SS DL 1 2 8 2.66 2.47
DVD-3 DS SL 2 2 8 2.92 2.72
DVD-4 DS DL 2 4 8 5.32 4.95
DVD-5 SS SL 1 1 12 4.70 4.38
DVD-9 SS DL 1 2 12 8.54 7.95
DVD-10 DS SL 2 2 12 9.40 8.75
DVD-14 DS DL/SL 2 3 12 13.24 12.33
DVD-18 DS DL 2 4 12 17.08 15.90

22. DVD drive speedsDVD drive speeds
Drive speed
Data rate ~Write time (min)
(Mbit/s) (MB/s) (MiB/s) SL DL
1× 10.80 1.35 1.29 61 107
2× 21.60 2.70 2.57 31 54
2.4× 25.92 3.24 3.09 25 45
2.6× 28.08 3.51 3.35 23 41
4× 43.20 5.40 5.15 15 27
6× 64.80 8.10 7.72 10 18
8× 86.40 10.80 10.30 8 13
10× 108.00 13.50 12.87 6 11
12× 129.60 16.20 15.45 5 9
16× 172.80 21.60 20.60 4 7
18× 194.40 24.30 23.17 3 6
20× 216.00 27.00 25.75 3 5
22× 237.60 29.70 28.32 3 5
24× 259.20 32.40 30.90 3 4

23. Flash memoryFlash memory

24. Flash DiskFlash Disk
((USB Flash DriveUSB Flash Drive ))
 Trek Technology and IBMTrek Technology and IBM began selling the first USBbegan selling the first USB
flash drivesflash drives (8 MB)(8 MB) commercially incommercially in 2000.2000. it’s flashit’s flash
memory device that connects to a computer's USBmemory device that connects to a computer's USB
port.port.
 They are typically small, lightweight, removable andThey are typically small, lightweight, removable and
rewritable. Storage capacities can range fromrewritable. Storage capacities can range from 16 MB16 MB
toto 256 GB.256 GB.

25. Blu-ray VS HD DVDBlu-ray VS HD DVD
2006-20082006-2008

26.  Blu-ray Disc (also known as Blu-ray or BD)Blu-ray Disc (also known as Blu-ray or BD)
Its main uses are for storing high-definitionIts main uses are for storing high-definition
video, PlayStation 3 games, and other data.video, PlayStation 3 games, and other data.
 The 1The 1stst
Blu-ray disc was created byBlu-ray disc was created by SonySony
and other companies in 2005, then arrivesand other companies in 2005, then arrives
to markets at midto markets at mid 20062006..

27. Blu-rays CapacitiesBlu-rays Capacities
Type
Physical
size
Single layer
capacity
Dual layer
capacity
Standard disc size 12 cm
25 GB
(23 866 MB)
50 GB
(47 732 MB)
Mini disc size 8 cm
7.8 GB
(7 430 MB)
15.6 GB
(14 860 MB)
In January 2007, Hitachi showcased a 100 GB Blu-ray Disc
In December 2008, Pioneer Corporation unveiled a 400 GB Blu-ray Disc
Ongoing development is under way to create a 1 TB Blu-ray Disc
as soon as 2013.

28. Recording speedRecording speed
Drive speed
Data rate
Write time for Blu-ray Disc
(minutes)
Mbit/s MB/s Single-Layer Dual-Layer
1× 36 4.5 90 180
2× 72 9 45 90
4× 144 18 23 45
6× 216 27 15 30
8× 288 36 12 23
12× 432 54 8 15

29. Byte ?Byte ?
Binary data consists of just two values, 0 and 1.
The term 'bit' comes from 'binary digit'

30. Why 1024 (2Why 1024 (21010
) ?) ?
Since computer memory is designed with binary logic,
multiples are expressed in powers of 2, rather than 10.
1024 number has no special significance to computers, but
is important to humans because we make use of powers of 10.
Symbol Prefix SI Meaning Binary meaning
k kilo 103
=1000 210
= 1024
M mega 106
220
G giga 109
230
T tera 1012
240
P peta 1015
250
E exa 1018
260
Z zetta 1021
270
Y Yotta 1024
280