# Computer Fundamentals Questions and Answers – Magnetic Disks

This set of Computer Fundamentals Multiple Choice Questions & Answers (MCQs) focuses on “Magnetic Disks”.

1. ________________ is used for writing/reading of data to/from a magnetic ribbon.
a) Magnetic disk
b) Magnetic tape
c) Magnetic frames
d) Magnetic Ribbon

Explanation: The magnetic tape ribbon is used for the same. It has read/write heads for reading/writing of data on the tape. When processing is complete, the tape is removed from the tape drive for off-line storage.

2. Magnetic disk is a sequential access device.
a) True
b) False

Explanation: It is a direct access secondary storage device. In case of direct access devices, the storage location may be selected and accessed at random.

3. The disk’s surface is divided into a number of invisible concentric circles called:
a) Drives
b) Tracks
c) Slits
d) References

Explanation: The concentric circles are called as tracks. The tracks are numbered consecutively from outermost to innermost starting from zero. The number of tracks on a disk may be as few as 40 on small-capacity disks to several thousand on large capacity disks.

4. The number of sectors per track on a magnetic disk ________
a) less than 5
b) 10 or more
c) 8 or more
d) less than 7

Explanation: Each track of a disk is subdivided into sectors. There are 8 or more sectors per track. Disk drives are designed to read/write only whole sectors at a time.

5. Generally there are __________bytes in a sector.
a) 64
b) 128
c) 256
d) 512

Explanation: Each track of a disc is divided into sectors. A sector typically contains 512 bytes. Disk drives are designed to read/write only whole sectors at a time.

6. Which of the following is not a part of disk address?
a) Sector size
b) Sector number
c) Track number
d) Surface number

Explanation: Disk address represents the physical location of the record on the disk. It is comprised of the sector number, track number, and surface number (when double-sided disks are used).

7. What does CHS stand for?
a) Cylinder-high-sector
d) Concentric-high-sector

Explanation: CHS stands for cylinder-head-sector. The scheme is called CHS addressing. The same is also referred to as disk geometry.

8. The interval between the instant a computer makes a request for the transfer of data from a disk system to the primary storage and the instance this operation is completed is called _________
a) Disk arrival time
b) Disk access time
c) Drive utilization time
d) Disk utilization time

Explanation: The interval is referred to as the disk arrival time. It depends on several parameters. Generally, a computer makes a request and the operation is served.

9. Disk access time does not depends on which of the following factors __________
a) Seek time
b) Latency
c) Transfer rate
d) Arrival rate

Explanation: The disk access time depends on the seek time, latency and transfer rate. Wherein, seek time is the time required to position the read/write head over the desired track.

10. The time required to spin the desired sector under the read/write head, once the read/write head is positioned on the desired track.
a) Seek time
b) Arrival rate
c) Latency
d) Transfer rate

Explanation: It is called latency. It is one of the factors on which the disk access time depends. Disk access time is the interval between the instant a request is made and the instance operation is completed.

Sanfoundry Global Education & Learning Series – Computer Fundamentals.

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