Storage Devices

1. zip disc . 750MB

2. floppy disc . l.44MB

3. removable media magnetic discs.

4. jaz disc . 2GB

5. WHY magnetic

5.1. magnetic storage stores data in tiny magnetic dots.

6. optical diveses

7. DVD rom 4.7GB

7.1. DVD-ROMs are used in the same way as CD-ROMs (see above) but, since they can hold more data, they are also used to store high-quality video. Read-Only Memory.

8. Blu-ray 25/50 GB

8.1. Blu-Ray discs are used in the same way as DVD-ROMs (see above) but, since they can hold more data, they are also used to store very high-quality, high-definition (HD) video. the best one yet with most space and best speed.

9. HD DVD 15GB

9.1. HD-DVD discs are used in the same way as DVD-ROMs (see above) but, since they can hold more data, they are also used to store very high-quality, high-definition (HD) video.

10. DVD ram 4.7GB

10.1. DVD-Random Access Memory (DVD-RAM) discs are a type of re-writable DVD. They often come in a floppy-disc style case (to protect the disc).

10.2. DVD-RAM discs have a similar capacity to a normal DVD, holding 4.7GB of data. DVD-RAM discs are random-access devices. DVD-RAM discs are used in many camcorders (video recording cameras).

10.3. The discs are much higher quality than normal DVD-RWs and can reliably store data for up to 30 years. This means that they are often used for video and data back-up and archiving.

11. Solid State

12. USB memory sticks

12.1. non-volatile, random-access Each of these small devices has some flash memory connected to a USB interface. Plug it into your computer and it appears as a drive. You can then add files, erase files, etc. You can use it to move any type of file between computers.

13. smart cards

13.1. Many credit cards (e.g. ‘chip-and-pin’ cards), door entry cards, satellite TV cards, etc. have replaced the very limited storage of the magnetic strip (the dark strip on the back of older cards) with flash memory. This is more reliable and has a much larger storage capacity. Cards with flash memory are called smart cards.

14. Solid State

14.1. An integrated circuit (IC) on a printed circuit board. This is called a solid state circuit because all of the electrical action in the circuit occurs within solid materials.

15. Solid state Drive

16. hard drives . 1

16.1. hard drives had large storage capacity they are ram. they have fast access speeds data is stored on either glass or metal discs

17. fixed hard drive .2

17.1. a hard drive built into the case and almost all have them

18. portable hard drive. 3

19. CD rom 800 MB

19.1. CD-ROMs are used to distribute all sorts of data: software (e.g. office applications or games), music, electronic books (e.g. an encyclopaedia with sound and video.)

20. CD.r DVD.r

20.1. CD-Recordable (CD-R) and DVD-recordable (DVD-R) discs can have data burnt onto them, but not erased. You can keep adding data until the disc is full, but you cannot remove any data or re-use a full disc.

20.2. Recordable

21. CD.rw DVD.rw

21.1. CD-ReWritable (CD-RW) and DVD-ReWritable (DVD-RW) discs, unlike CD-Rs and DVD-Rs, can have data burnt onto them and also erased so that the discs can be re-used.

21.2. ReWritable

22. memory cards

22.1. Many of our digital devices (cameras, mobile phones, MP3 players, etc.) require compact, non-volatile data storage. Flash memory cards provide this and come in a variety of shapes and sizes. One of the most common formats used by digital cameras is the SD Card. The cards store the digital images taken by the camera. Mobile phones contain a Subscriber Identity Module (SIM) card that contains the phone’s number, the phonebook numbers, text messages, etc. Many phones also have extra memory cards to store music, video, photos, etc. (e.g Tiny Micro-SD cards).

23. back up

23.1. A backup simply means making one or more copies of your data. For example, if you have a folder of photos stored on the hard-drive of your laptop, you might back them up by copying them to a CD-R