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

Assignment 2
ECE 311
Computer Architecture and Organization
Fall 2020
Due date: Oct. 16, 2020 9:00 pm
Marks
Question Mark Your Mark
Q1 2
Q2 3
Q3 4
Q4 6
Q5 3
Q6 3
Q7 4
TOTAL 25
Note
You should justify your answers.
1 of 5

Assignment 2
Q1 { 2 marks } Consider a hard drive (rotating disk) with 4 platters. Suppose both surfaces of platters are used for
recording.
(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 as multiple zone recording , where the set of
cylinders is partitioned into disjoint subsets known as recording zones . Each zone consists of a contiguous
collection of cylinders. Each track in each cylinder in a zone has the same number of sectors, which is
determined 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 =
10
9
bytes)
(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 = 400
Assume both sides of platters are used for recording.
Q3 { 4 marks } Estimate the average time (in ms ) to access a sector on the following disk:
Parameter Value
Rotational rate 12,000 RPM
T
avg seek
5 ms
Average # sectors/track 500