Q21GATE 2008MCQ

The total time to prepare a disk drive mechanism for a block of data to be read from it is

Q22GATE 2007MCQ

Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stored in a bit serial manner in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk are respectively:

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📖 Explanation

The total capacity is calculated by multiplying the number of surfaces, tracks per surface, sectors per track, and bytes per sector.
$\text{Capacity} = 16 \times 128 \times 256 \times 512 \text{ bytes} = 2^4 \times 2^7 \times 2^8 \times 2^9 \text{ bytes} = 2^{28} \text{ bytes}$
Since $1 \text{ Mbyte} = 2^{20} \text{ bytes}$ , the capacity is $2^{28} / 2^{20} = 2^8 \text{ Mbyte} = 256 \text{ Mbyte}$ .

To specify a particular sector, we need bits for the surface, track, and sector number.
Number of bits for surface = $\lceil \log_2(16) \rceil = 4$ bits.
Number of bits for track = $\lceil \log_2(128) \rceil = 7$ bits.
Number of bits for sector = $\lceil \log_2(256) \rceil = 8$ bits.
Total bits required = $4 + 7 + 8 = 19$ bits.

Q23GATE 2007MCQ

A hard disk system has the following parameters : Number of tracks = 500 Number of sectors/track = 100 Number of bytes /sector = 500 Time taken by the head to move from one track to adjacent track = 1 ms Rotation speed = 600 rpm. What is the average time taken for transferring 250 bytes from the disk ?

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Q24GATE 2007MCQ

Which of the following RAID level provides the highest Data Transfer Rate (Read/Write)

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Q25GATE 2005MCQ

A disk has 8 equidistant tracks. The diameters of the innermost and outermost tracks are 1 cm and 8 cm respectively. The innermost track has a storage capacity of 10 MB. If the disk has 20 sectors per track and is currently at the end of the $5^{th}$ sector of the inner-most track and the head can move at a speed of 10 meters/sec and it is rotating at constant angular velocity of 6000 RPM, how much time will it take to read 1 MB contiguous data starting from the sector 4 of the outer-most track?

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Q26GATE 2005MCQ

A disk has 8 equidistant tracks. The diameters of the innermost and outermost tracks are 1 cm and 8 cm respectively. The innermost track has a storage capacity of 10 MB. What is the total amount of data that can be stored on the disk if it is used with a drive that rotates it with I.Constant Linear Velocity II.Constant Angular Velocity?

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Q27GATE 2004MCQ

The storage area of a disk has the innermost diameter of 10 cm and outermost diameter of 20 cm. The maximum storage density of the disk is 1400 bits/cm. The disk rotates at a speed of 4200 RPM. The main memory of a computer has 64-bit word length and 1 $\mu s$ cycle time. If cycle stealing is used for data transfer from the disk, the percentage of memory cycles stolen for transferring one word is

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Q28GATE 2003MCQ

Using a larger block size in a fixed block size file system leads to

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Q29MCQ

Raid configurations of the disks are used to provide

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Q30MCQ

Formatting for a floppy disk refers to

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Q31MCQ

The data transfer rate of a double-density floppy disk system is about:

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