Storage devices used in cmp13to14
-
Upload
myrajendra -
Category
Documents
-
view
374 -
download
0
Transcript of Storage devices used in cmp13to14
![Page 1: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/1.jpg)
http://improvec.blogspot.in/ 1
Storage devices used in computers
![Page 2: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/2.jpg)
http://improvec.blogspot.in/ 2
Objective:
On completion of this period, you would be On completion of this period, you would be able to know:able to know:
The storage devices used in computers.The storage devices used in computers.
![Page 3: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/3.jpg)
http://improvec.blogspot.in/ 3
Recap:
Why Cache Memory is used ?
Cache Memory is used to increase the speed of the computer.
![Page 4: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/4.jpg)
http://improvec.blogspot.in/ 4
Prerequisites:
What is storage media?
The physical components or materials on which data is stored called storage media.
![Page 5: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/5.jpg)
http://improvec.blogspot.in/ 5
What are storage devices ?
The hardware components that write data to, and read it from, storage media are called storage devices.
Example: floppy disk
![Page 6: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/6.jpg)
http://improvec.blogspot.in/ 6
Categories of storage technology
The two main categories of storage technology used today are
Magnetic storage
Optical storage
![Page 7: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/7.jpg)
http://improvec.blogspot.in/ 7
Magnetic storage
The primary types of magnetic storage are as follows:
Diskettes
Hard disks (both fixed and removable)
![Page 8: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/8.jpg)
http://improvec.blogspot.in/ 8
Magnetic storage (contd...)
High capacity floppy disks
Disk cartridges
Magnetic tape
![Page 9: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/9.jpg)
http://improvec.blogspot.in/ 9
Magnetic storage (Contd...)
Magnetic storage devices work by polarizing tiny pieces of iron on the magnetic medium.
Read/write heads contain electromagnets that create magnetic charges on the medium.
![Page 10: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/10.jpg)
http://improvec.blogspot.in/ 10
Diskettes
Diskette drives, also known as floppy disk drives, read & write to diskettes.
Diskettes are used most often to transfer files between computers
as a means for distributing softwareas a backup medium.
![Page 11: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/11.jpg)
http://improvec.blogspot.in/ 11
Diskettes (contd)
Diskettes are available in two sizes : 5.25 inch and 3.5 inch.
The 5.25 inch diskette is rarely used today.
![Page 12: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/12.jpg)
http://improvec.blogspot.in/ 12
Hard disks
Hard disk can store more data than diskettes because of
their higher density media
faster rotational speed and
the tiny distance between the read/write head & the disk surface.
![Page 13: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/13.jpg)
http://improvec.blogspot.in/ 13
High capacity floppy disk
High capacity floppy disk are becoming a popular add- on for many computers.
They offer capacities up to 250MB and the same portability as standard floppy disks.
![Page 14: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/14.jpg)
http://improvec.blogspot.in/ 14
Disk cartridges
A disk in plastic case that is inserted into or removed from the drive. The disk and the case are often called disk cartridge.
Disk cartridges are like small removable hard disks and can store up to 2GB.
![Page 15: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/15.jpg)
http://improvec.blogspot.in/ 15
Magnetic tape
Magnetic tape system offer slow data access.
Because of their large capacities and low cost, they are a popular backup medium.
![Page 16: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/16.jpg)
http://improvec.blogspot.in/ 16
Optical storage
The primary types of optical storage are as follows:
Compact Disk Read-Only Memory (CD - ROM).
Digital Video Disk Read-Only Memory (DVD - ROM).
![Page 17: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/17.jpg)
http://improvec.blogspot.in/ 17
Optical storage (contd)
CD - Recordable (CD-R) .
CD - Rewritable (CD - RW).
Photo CD.
![Page 18: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/18.jpg)
http://improvec.blogspot.in/ 18
CD-ROM
CD-ROM uses the same technology as a music CD does; a laser reads lands and pits on the surface of the disk.
Standard CD-ROM disks can store up to 650 MB.
Once data is written to the disk, it cannot be changed.
![Page 19: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/19.jpg)
http://improvec.blogspot.in/ 19
Digital Video Disk Read-Only Memory (DVD-ROM).
DVD-ROM technology is a variation on standard CD-ROM.
DVD-ROM is a high density medium capable of storing a full length movie on a single disk
DVD-ROM offers capacities up to 17 GB.
![Page 20: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/20.jpg)
http://improvec.blogspot.in/ 20
CD - Recordable (CD-R) .
CD-Recordable drive can be attached to a computer as a regular peripheral device.
CD-R allows you to create your own CD-ROM disks that can be read by any CD-ROM drive.
![Page 21: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/21.jpg)
http://improvec.blogspot.in/ 21
CD - Recordable (CD-R) (contd).
After the information has been written into a part of the CD, that information cannot be changed.
With most CD-R drives, however, you can continue to record information to other parts of the disk until it is full.
![Page 22: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/22.jpg)
http://improvec.blogspot.in/ 22
CD - Rewritable (CD-RW).
CD-Rewritable drives , however, users can write and overwrite data onto compact disks.
![Page 23: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/23.jpg)
http://improvec.blogspot.in/ 23
Photo CD
One popular form of recordable CD is Photo CD.
Developed for storing digitized photographic images on a CD
Many film developing devices now have photo CD drives that can store your photos and put them on a CD.
![Page 24: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/24.jpg)
http://improvec.blogspot.in/ 24
Photo CD (contd..)
With a photo CD, you can continue to add images until the disk is full.
Written images cannot be erased or changed.
![Page 25: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/25.jpg)
http://improvec.blogspot.in/ 25
Summary:
In this class, you have learnt about
different storage devices used in computers.
![Page 26: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/26.jpg)
http://improvec.blogspot.in/ 26
Frequently Asked Questions
1. List the storage devices.?
2. Explain the primary magnetic storage devices used in computers?
3. Explain the primary optical storage devices?
![Page 27: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/27.jpg)
http://improvec.blogspot.in/ 27
Quiz:
1. Storage device which offer slow data access.a. Magnetic tape
b. diskettesAnswer: a
![Page 28: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/28.jpg)
http://improvec.blogspot.in/ 28
Contd..
2. CD developed for storing digitized photographic images is a. CD-R
b. Photo CDAnswer: b
![Page 29: Storage devices used in cmp13to14](https://reader036.fdocuments.in/reader036/viewer/2022070604/543b41e28d7f725c6a8b5db6/html5/thumbnails/29.jpg)
http://improvec.blogspot.in/ 29
Contd..
3. The high density medium capable of storing a full length movie on a single disk isa. DVD-ROMb. CD-RW
Answer: a