Consider a Disk /O transfer, in which 1500 bytesare to be transferred, but number of bytes on atrack is 1000, and rotation speed of disk is 1500rps but the average time required to move thedisk arm to the required track is 15 ms, thenwhat will be total access time?

Given No.of bytes to be transferred (b)=1500 bytes Rotation speed (r)=1500 Number of bytes on track…

Answered: Consider a Disk 1/O transfer, in which…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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For example, we mentioned in our explanation of the physical elements of disk performance that upgrading from 7,200rpm disks to 10,000rpm disks may result in a performance increase ranging from 10% to 50%. What might possibly cause a 10% increase in performance? Is it possible that there will be no improvement at all? Explain. (Hint: Rotational delay is not the only element that influences the performance of a hard drive.)
Suppose that a magnetic dick drive has the following characteristics: Rotational speed = 20000 RPM HTH switching time = 3 ms Average TTT seek time = 3 ms 6 platters, 1024 tracks per platter side recorded on both sides, 60 sectors per track on all tracks. Sector size = 512. The Questions are as following: What is the drive’s storage capacity? How long it will take to read the drive’s entire contents sequentially?
One disc makes 7200 revolutions per minute. There are 24 tracks on the disc and 8 sectors on each track. 2. A file saved in 2 consecutive sectors on the track and 4 consecutive sectors on track 20 will be read. The reader head of the disc is on the tenth (10) track when the reading starts. The transition time of the head from one track to another takes 10 ms. Assuming that there are 1024 bytes in each sector and the data transfer rate is equal to the rotation speed of the disk, what is the time to read one sector and read the entire file? 1,04 ms ; 274,54 ms C. 6,24 ms; 307,25 ms 8,3 ms; 180,75 ms 8,3 ms ; 298,5 ms
A manufacture wishes to design a hard disk with a capacity of 60 GB or more (using thestandard definition of 1GB = 230 bytes). If the technology used to manufacture thedisks allows 512-bytes sectors, 1024 sector/track, and 60% tracks/ platter, how many platters are required?
I need the answer as soon as possible
Suppose we have a magnetic disk with the following parameters: Average seek time = 12 ms Rotation rate = 7200 RPM Transfer rate = 48 MB/second Sector size = 512 bytes What is the average time to read a single sector?
Consider a DRAM chip of capacity 256 KB and each memory location contains 8 bits. The memory chip is organized in matrix form with equal number of rows and column for each memory location of 8 bits. This DRAM chip has a refresh interval of 64 ms, memory bus runs at 200 MHz, and the refresh cycle takes 4 clock cycle. a) Time required to refresh the DRAM chip. b) What is the minimum size of the refresh counter?
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Consider a Disk 1/O transfer, in which 1500 bytes are to be transferred, but number of bytes on a track is 1000, and rotation speed of disk is 1500 rps but the average time required to move the disk arm to the required track is 15 ms, then what will be total access time?