The FCFS schedule is 143, 86, 1470, 913, 1774, 948, 1509, 1022,1750, 130. The total seek distance is 7081. The SSTF schedule is 143, 130, 86, 913, 948, 1022, 1470, 1509, 1750,1774. The total seek distance is 1745.  Assume that a disk can perform a seek to an adjacent cylinder in 1 millisecond and a full-stroke seek over all 5000 cylinders in 18 milliseconds. The total seek times for FCFS is computed to be 65.20, SSTF is 31.52,  SCAN is 62.02,  LOOK is 40.29, C-SCAN is 62.10 and C-LOOK is 40.42. Which of the algorithms is the fastest? And what is the percentage speedup of the fastest algorithm over FCFS?

Q: Describe the four areas (in order) of a 1.44 MByte diskette

A: Four areas of 1.44MB diskette are: Boot record File allocation table Root directory Data area.

Q: Assume that the head of a moving-head disc has 200 tracks numbered 0 to 199 and is currently serving…

A: The FCFS Disk Scheduling Technique is the most basic disc scheduling algorithm, and it works on a…

Q: Suppose that a disk drive rotates at 8000 RPM. It has an average Seek time of 4 milliseconds. If its…

A: Disk drive is a software to read, write or save data in disk memory. It gives memory space to store…

Q: For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional…

A: For a magnetic disk with concentric circular tracks, the seek latency is not linearly proportional…

Q: Compare the bit-map and hole-list methods for keeping track of free space on a disk with 800…

A:

Q: a. Using a writing speed of 700 Mbits/s, how long would it take to store a 40 GB raw video file on a…

A: Data compression rate, also known as compression strength, is the rate of related reduction of data…

Q: Assume two disks now perform RAID3 for bits given below 111111 0000000 Show all steps how data is…

A: RAID 3 is a Redundant Array of Independent Disks (RAID) standard that uses striping at the byte…

Q: Assume that 1000MB of data needs to be transferred to the hard disk at the rate of 200 MB /sec.…

A: We need to find the total context switch component time for the given scenario.

Q: A 2.5 Inch diameter disk has 8 platters with each platter having two data recording surfaces, each…

A:

Q: Suppose a disk rotates at 5,400 revolutions per minute and has each surface divided into 16 sectors.…

A: ANSWER TO THE GIVEN QUESTION   Hard disk rpm speed is 5400 and hard disk is divided into 16 sectors.…

Q: Consider a disk with a sector size of 512 bytes, 2000 tracks per surface, 50 sectors per track, five…

A: (1) Capacity of track = bytes/sector * sectors/track = 512 * 50 = 25K in bytes i.e. 25K Capacity of…

Q: onsider a disk with the following characteristics

A: The question is asking for the capacity of a track and the capacity of the disk based on given…

Q: 5. Consider a program that generates the following set of page references: BDBAEFBFAGEFAAFBACGF AC…

A: Page Fault: A page fault happens when a running program accesses a memory page that is mapped into…

Q: 50à 55à 65à 37à 19à 11à 100à 150     50à 55à 65à 100à150à 37à 19à11     50à 55à 65à 100à150à 37à…

A: Initially at track 50. Nearest track is 55. Then nearest track is 65. after that nearest track is…

Q: Consider a disk with following specifications: 20 surface, 1000 tracks/surface, 16 sectors/track,…

A: According to the information given:- We have to follow the instruction in order to get data transfer…

Q: For a 5,000 RPM disk, assume its average seek time is 7 msec, and it has 100 MB/sec bandwidth;…

A: To answer these questions, we will use the following formulas: Average access time = Average seek…

Q: Consider an array of six drives in which Z0 through Z4 contain data and Z5 is the parity disk.…

A: RAID or “Redundant Arrays of Independent Disks” is a technique which makes use of a combination of…

Q: Indicate the three techniques for WORM disk recording

A: To find out: Three techniques of recording WORM discs are listed below.

Q: A program repeatedly perform the 3steps process: it reads a 4KB block of data from disk, does some…

A: As program performing a repetitive process involving reading data from disk, processing it, and…

Q: Consider a disk with a sector size of 512 bytes, 2000 tracks per surface, 50 sectors per track, five…

A:

Q: 114. The total transfer time for a disk I/O operation magnetic is equal to 30 msec. Knowing that:…

A: Given: The total transfer time for a disk I/O operation magnetic is equal to 30 msec. The overall…

Q: By how much is an SSD faster than a magnetic disk?

A: SSD: The full form of SSD is Solid-State Drive. It is nothing but a huge storage device that holds…

Q: 2. Suppose that the hard disk on your personal computer rotates at 3000 revolutions a minute, that…

A:

Q: Let's say there are seven requests: 16, 24, 43, 82, 140, 170, and 190. Additionally, the disc arm is…

A: To calculate the total seek time, you will need to determine how far the disk arm must move to reach…

Q: A disk drive has 1000 cylinders, 8 tracks per cylinder, 32 sectors per track, and 512 bytes per…

A: Average time = seek time + average rotational latency+ data transfer time.  Here since data transfer…

Q: A manufacture wishes to design a hard disk with a capacity of 60 GB or more (using the standard…

A: Given data: The hard disk capacity is 60GB. Disk will allow 512 bytes. It will also allow 1024…

Q: Parallel wires are used by SAS to interact with SCSI disks. Is this correct or incorrect?

A: Introduction: Data may be sent between computers and peripheral devices using Small Computer System…

Q: disk has 1024 sectors/track and 4096 bits/sector. Assuming a rotation rate of 10,200 RPM, calculate…

A: Disk can be defined as it refers to the physical or storage device used to store and store digital…

Q: Consider a 4 inch disk with 64 double-surfaced platters rotating at 7200 rpm. It has a usable…

A: Given  Capacity = 16 gigabytes = 234 No.of cylinders = 1024 = 210 No.of platters = 64 = 26 Bytes per…

Q: ck 45 (of track 0- 255 tive direction. Assume quests have been made 240, 87. - time using C-SCAM

A:

Q: Suppose that a magnetic dick drive has the following characteristics:   Rotational speed = 20000…

A: Actually, given information Rotational speed = 20000 RPM HTH switching time = 3 ms Average TTT…

Q: 116. The total transfer time for a disk I/O operation magnetic is equal to 36 msec. Knowing that the…

A: Here is The Correct and Detailed Explanation of this Question.   The total transfer time for a disk…

Q: One disc makes 7200 revolutions per minute. There are 24 tracks on the disc and 8 sectors on each…

A: Total tracks= 24  Sectors per track=8 Number of revolutions = 7200 per minute rotation speed…

Fundamentals of Input and Output Performance

The I/O subsystem is a component of computer system design that uses buses to assist communication between the Central Processing Unit, Computer Memory/Storage, and Input and Output Devices (that is known as peripheral devices). The I/O subsystem includes disc controllers, tape drives, discs, system buses, and other devices. The I/O database application reads and writes drives using the operating system windows I/O.