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CS351HW1-Fall2009.Sol

CS351HW1-Fall2009.Sol - S a l i m S a r m u r a t H W 1 |1...

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S a l i m S a r ı m u r a t H W # 1 | 1 CS351, Fall 2009, HW1 Solutions S1. Storage Type Capacity Speed of Access Cost RAM 1GB – 4 GB 50ns – 60 ns 0.04 $/MB Hard Disc 100GB – 1 TB 5.55 ms 0.09 $/GB Floppy Disc 1.44 MB 100 ms 0.18 $/MB CD ROM 650 MB – 750 MB 70 ms 0.28 $/GB DVD 4.7GB 110 ms 0.17 $/GB Blu Ray Optical Media 25GB 10 ms 0.18 $/GB Magnetic Tapes 1TB 5 6 ms 1 $/GB S2. a) 5400 rpm b) 7200 rpm Period of Revolution = 5400 1 minutes = 60 5400 1 × seconds = 1 0 , 0 seconds = 1 . 11 milliseconds Average Rotational Delay = 2 1 . 11 milliseconds = 5 . 5 milliseconds Period of Revolution = 7200 1 minutes = 60 7200 1 × seconds = 3 008 . 0 seconds = 3 . 8 milliseconds Average Rotational Delay = 2 3 . 8 milliseconds = 6 1 . 4 milliseconds S3. a) Both tracks have the same amount of recording capacity because btt (block transfer time) for every track should be the same on a disk. b) Since the recording capacities are the same and T1 has smaller radius than T2 , the recording density (bits/inch) of T1 is greater than T2 ’s recording density.
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