Storage in Computers I/O

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Presentation transcript:

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.

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.

Physical HD . Track 5-10microns Sector A Head Head movement A piece of enlarged track

Physical HD---cont…. Collective movement .

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.

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

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)

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?