# Solution2.pdf - Assignment 2 ECE 311 Computer Architecture...

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Assignment 2ECE 311Computer Architecture and OrganizationFall 2020Due date: Oct. 16, 2020 9:00 pmMarksQuestionMarkYour MarkQ12Q23Q34Q46Q53Q63Q74TOTAL25NoteYou should justify your answers.1 of 5
Assignment 2Q1{2 marks}Consider a hard drive (rotating disk) with 4 platters. Suppose both surfaces of platters are used forrecording.(a) How many heads does the hard drive have?(b) How many tracks are per cylinder?
Q2{3 marks}Modern high-capacity disks use a technique known asmultiple zone recording, where the set ofcylinders is partitioned into disjoint subsets known asrecording zones. Each zone consists of a contiguouscollection of cylinders.Each track in each cylinder in a zone has the same number of sectors, which isdetermined by the number of sectors that can be packed into the innermost track of the zone.What is the capacity of a hard drive with the following parameters? (write your answer in gigabytes; 1GB =109bytes)(a) number of platters = 8(b) number of bytes per sector = 512(c) number of zones = 2(d) number of cylinders per zone 1= 8,000(e) number of cylinders per zone 2= 10,000(f) number of sectors per track for zone 1 = 800(g) number of sectors per track for zone 2 = 400Assume both sides of platters are used for recording.
Q3{4 marks}Estimate the average time (inms) to access a sector on the following disk:ParameterValueRotational rate12,000 RPMTavg seek5msAverage # sectors/track500

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Tags
Hard disk drive, Cylinder head sector