Secondary Storage


Q21.

Which of the following RAID level provides the highest Data Transfer Rate (Read/Write)
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Q22.

Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stores 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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Q23.

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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Q24.

Which RAID level gives block level striping with double distributed parity?
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Q25.

An application loads 100 libraries at startup. Loading each library requires exactly one disk access. The seek time of the disk to a random location is given as 10ms. Rotational speed of disk is 6000rpm. If all 100 libraries are loaded from random locations on the disk, how long does it take to load all libraries? (The time to transfer data from the disk block once the head has been positioned at the start of the block may be neglected)
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Q26.

A hard disk has 63 sectors per track, 10 platters each with 2 recording surfaces and 1000 cylinders. The address of a sector is given as a triple (c,h,s), where c is the cylinder number, h is the surface number and s is the sector number. Thus, the 0^{th} sector is addressed as (0,0,0), the 1^{st} sector as (0,0,1), and so on The address (400, 16, 29) corresponds to sector number:
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Q27.

SATA is the abbreviation of
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Q28.

Raid configurations of the disks are used to provide
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Q29.

A hard disk has 63 sectors per track, 10 platters each with 2 recording surfaces and 1000 cylinders. The address of a sector is given as a triple (c,h,s), where c is the cylinder number, h is the surface number and s is the sector number. Thus, the 0^{th} sector is addressed as (0,0,0), the 1^{st} sector as (0,0,1), and so on The address of the 1039^{th} sector is
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