Podcast
Questions and Answers
What is the term for the SCAN algorithm used in operating systems to manage disk I/O?
What is the term for the SCAN algorithm used in operating systems to manage disk I/O?
Which type of device transfers data in and out as a stream of bytes with no block structure?
Which type of device transfers data in and out as a stream of bytes with no block structure?
What is the purpose of Smoothing in I/O management?
What is the purpose of Smoothing in I/O management?
What is the term for the set of sectors on a disk that are directly above or below each other?
What is the term for the set of sectors on a disk that are directly above or below each other?
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What is the main advantage of using Interrupt-driven I/O?
What is the main advantage of using Interrupt-driven I/O?
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What is the purpose of the DMA module in I/O operations?
What is the purpose of the DMA module in I/O operations?
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What is the total number of bytes per track in a disk with 63 sectors per track and 512 bytes per sector?
What is the total number of bytes per track in a disk with 63 sectors per track and 512 bytes per sector?
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How many cylinders are needed to store 50,000 records of 256 bytes each, given the disk characteristics provided?
How many cylinders are needed to store 50,000 records of 256 bytes each, given the disk characteristics provided?
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What is the main advantage of using Disk Striping?
What is the main advantage of using Disk Striping?
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What is the category of external devices suitable for communicating with the computer user?
What is the category of external devices suitable for communicating with the computer user?
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Study Notes
Disk Capacity Calculation
- Sector capacity is calculated by dividing the sector size by the record size.
- Track capacity is the product of sector capacity and the number of sectors per track.
- Cylinder capacity is the product of track capacity and the number of tracks per cylinder.
- Drive capacity is the product of cylinder capacity and the number of cylinders needed.
Calculating Disk Space
- To store 300,000 128-byte logical records, the required disk space is 41.25 MB.
- To store 300,000 120-byte logical records, the required disk space is 41 MB.
I/O Operations
- The processor sends a set of information to the DMA module to initiate a read or write operation.
- In interrupt-driven I/O, the processor issues the I/O command, and there are two possibilities: the processor waits for the operation to complete or the processor continues executing other tasks.
Objectives of I/O Facility Design
- Two paramount objectives of designing the I/O facility are: (brief explanation needed)
Disk Characteristics
- A disk with 512 bytes/sector, 96 sectors/track, 110 tracks/surface, and 8 usable surfaces has a surface capacity of 42,240 records.
Cylinder Calculation
- To store 50,000 fixed-length records of 256 bytes each, the required number of cylinders can be calculated.
Multiple Choice
- The correct answer for the category of external devices suitable for communicating with the computer user is D. human readable.
- The correct answer for the type of data transferred by a stream-oriented device is D. data.
- The correct answer for the component that need not spend time waiting for an I/O operation to be performed in Interrupt-driven I/O is A. processor.
- The correct answer for the technique that smooths out peaks in I/O demand is C. Smoothing.
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Description
Calculate the storage capacity of a disk drive and determine the number of cylinders required to store a certain number of logical records. Test your understanding of disk storage concepts and formulas.
