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Storage in Computers I/O

Storage in Computers I/O. Magnetic disks: A magnetic disk consists of one or more aluminum platters with a magnetizable coating. 1. Originally, as much as 50 cm in diameter. Now, 3 – 12 cm. In notebook pc’s or cameras, they can be as small as1-2cm in diameter.

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Storage in Computers I/O

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  1. Storage in Computers I/O • Magnetic disks: • A magnetic disk consists of one or more aluminum platters with a magnetizable coating. • 1. Originally, as much as 50 cm in diameter. • Now, 3 – 12 cm. In notebook pc’s or • cameras, they can be as small as1-2cm in • diameter.

  2. Magnetic Disks ---Cont… • 2. Capacity 5-20MB only a dozen years • ago. Now, they can be as large as 100GB. • *** Compare: An ordinary computer science textbook contains about 1 million bytes. 100GB can store 100,000 such books, basically, a whole library can be put into one disk. • 3. Fast and reliable. 3600-100,000turns/s • 7,200turns/s is typical.

  3. Physical HD Track 5-10microns Sector • . A Head Head movement 0.1 – 0.2 Microns A piece of enlarged track

  4. Physical HD---cont…. Collective movement • .

  5. Floppy and Tape Drives • They are shrink their roles in PC and soon will be totally disappear. • Currently, 3 ½ “ floppy still a convenient tool for personal use, especially for students. • Tape drive can hold more information. However, the speed has been a major issue.

  6. CD – ROM, DVD-ROM, DVD-RAM • Because of the capacity, reliability and durability, they have become more and more popular. • Which includes CD-R and CD-RW

  7. The NEW technologies are coming • There are a lot of research going on in information storage technologies. • 1. Optical 3-D storage • 2. Use spin-up and spin-down of atoms. • 3. Magnetic RAM (IBM)

  8. Homework • 1. How many books a 4.7GB DVD-ROM can store? (Assuming that each book has an average of 1 million characters) • 2. Compare between HD and CD-RW, can we replace HD with CD-RW? • 3. If you have the choice of the future storage devices and storage media, what kind of properties you like them to have?

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