shortest seek time first

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shortest seek time first

Postby mathalor » Sun Dec 07, 2008 10:30 pm

Page No: 194 Q.n.9 gate 2007(IT) Linked question

The head of a hard disk serves requests following the shortest seek time first policy.The head is initially positioned at track number 180.

Q1.which of the request sets will cause the head to change its direction after servicing every request assuming that the head does not change direction if there is a tie is SSTF and all the requests arrive before the servicing starts?
A)11,139,170,178,181,184,201,265
B) 10,138,170,178,181,185,201,265
C)10,139,169,178,181,184,201,265
D)10,138,170,178,181,185,200,265

for this the correct option is B,
This one i have got....but regarding 2nd part I am not getting the question!!!!!!!!


Q2. what is the maximum cardinality of the request set,so that the head changes its direction after serving every request if the total of tracks are 2048 and the head can start from any track?
A)9
B)10
C)11
D)12

Can anyone explain me what it is asking for???...and what is correct option...???????
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Re: shortest seek time first

Postby bhupeshchawda » Fri Dec 12, 2008 9:00 pm

Hi,
This should help: viewtopic.php?f=27&t=2340 :)
Regards,
Bhupesh
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Re: shortest seek time first

Postby mathalor » Sun Dec 14, 2008 7:56 pm

thanks Bhupesh
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Re: shortest seek time first

Postby vijaydaultani » Wed Jun 08, 2011 11:57 am

bhupeshchawda wrote:Hi,
This should help: http://www.gatementor.com/viewtopic.php?f=27&t=2340 :)



THis link is not wrking
?
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Re: shortest seek time first

Postby sreejithkp » Mon Jul 15, 2013 10:13 am

How did u get the answer for first question ? Cud u pls help?

sreejith...
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