1. In The Name Of Allah UINT 8 Storage Davies

2. Storage devices Rules for CD-ROM and floppy disk care. 1- Hold a CD-ROM by the edges. 2- Keep the optical/silver side of a CD-ROM clean. 3- Don’t smoke when you use your CD-ROM drive. 4- Don’t put floppy disks near a magnet.

3. 5- Keep disks away from the sun and excessive heat. 6- Write the contents on floppy disks. 7-Don’t Put extra labels on floppy disks. 8-Don’t Remove by force a disk stuck in the drive. 9- Don’t Remove a disk when the drive light is on.

4. Hard disk drive Hard disk drive Gab between disks disks Drive motor Read \ write heads Head motor Sealed case

5. 1- What stor of things can damage a hard disk ? 2- How big is the gab between the read/write heads and the disk? 3 - How can we portect a disk drive from damage?

6. Most computer use floppy disks. Floppies conform to a standard and you can use them to carry data from one place to another.They are also very cheep, but they are slow and have limited capacity.

7. Almost all desktop computers have hard disks. They are fast and can store much greater amounts of data then floppies,but they are fixed inside the computer and you cannot use them to transfer data.

8. You can move data from place to place using removable hard disks. They are almost as fast as fixed hard disks and have high capacities but they are relatively expensive.They do not all conform to one standard and they are not very common.

9. CD-ROM disks are very common and conform to a standard.They are removable and can hold large amounts of data.They are also cheap to make.However, they are usually read – only.You cannot change the information on them. They are also slow compared to hard disks.

10. Magneto-optical disk are like CD-ROMs But you can writ data on to them.They are removable,have large capacities, and last for a long time, but they are expensive and do not all conform to one standard. For this reason they are not very common.

11. Magnetic tape is a cheap medium. You can use it to store very large amounts of data but it dose not allow random access. Every time you read or write a piece of data, you start at the beginning of the tape. Tape drives are slow. Therefore, it is only suitable for doing backups.

12. Limited capacity,slow Very cheap PortableStandard Floppy disk Not portable, fixed can not use to turn seferdata Fast, larg, capacity cantransfere data Fixed hard disk Expensive,not standard, not common. Fast, large capacity cantransfer data Removable hard disk Read only,can't chaing informitions. slow Chaep,fast, portable, common, larg capacity CD-ROM disk Axpensive,not standard,not common. Removable, can be written,large capacity. Magneto-optical disk Slow, no random access. Chaep,large capacity.. Magnetic tape Medium AdvantagesDisadvantages

13. Summary of storage devices. Floppies are very cheap, but they are slow and have a limited capacity. Hard disks are fast and Can store large amounts of data but they are fixed inside the computer, so you cannot use them to transfer data. You can transfer data with removable hard disks, but they are expensive CD- ROM Disks can hold quite large amounts of data. however., they are usually read – only so you cannot change the information on them.

14. Magneto – optical disks are like CD-ROMs but you can write data on to them. They are removable and have large capacities but they are expensive and do not conform to a standard. For this reason they are not very common. Magnetic tape is cheap and has a large capacity, but it does not allow random access and drives are slow. Therefore it is only suitable for backups.