An HDD disk head is initially positioned over track 100 and is moving in the direction of decreasing track number. It receives requests for a number of tracks in the following order: 20, 130, 115, 186, 174, 43, 12, 61, 121. What is the average seek time in a SCAN scheduling policy? Analysis of Average Seek Time with SCAN Scheduling

Analyse of the Average Seek Time using SCAN Scheduling

Policy   The average seek time in a SCAN scheduling policy is the time required for a head of a hard drive disk (HDD) to move from the initially positions of track no. From 100 tracks to the required tracks. It is difficult to understand as the head can move back and forth between lower tracks numbers and higher numbers depending on the request. You must identify the path that the head follows in the most efficient way for both the average wait time and the seek time.  According to the SCAN scheduling policy the head must move in one direction until reaching one track. Then it should reverse the direction. The head would move from track 100, where it was initially placed, to track 20. Track 130 is next, and the process continues until the head reaches track 0. This would include the wait time and the total movement time of the head.   You can calculate the average seek times in SCAN scheduling policies by taking into account head movement and wait time.   References  Tatar, S. (2015). Seek time optimization methods for hard disk data storage requests. Automation and Computing, 21(2). DOI: 10.14355/AAC.2015.21.02.03   Ebrahim, A. (2021). A Study of Scheduling Policies on Hard Disk. International Journal of Computer Networks and Communications Security 9(2). DOI: 10.26456/ijcncs.2021.9.2.157Cont…

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