Question 9231 – GATE 2007
January 24, 2024Question 9240 – GATE 2007
January 24, 2024Question 9235 – GATE 2007
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:
Correct Answer: A
Question 11 Explanation:
Given that the disk pack has 16 surfaces, 128 tracks per surface, 256 sectors per track and each sector size is 512 bytes.
So the disk pack capacity = 16 * 128 * 256 * 512 bytes = 256 MB
To specify a sector we need the information about surface number, track number and sector number within a track. Surface number needs 4 bits as there are 16 surfaces(24), track number needs 7 bits as there are 128 tracks(27) within a surface, within a track the sector number needs 8 bits as there are 256 sectors (28). Total number bits needed to specify a particular sector = 4+7+8 = 19 bits. Hence option A is the answer.
So the disk pack capacity = 16 * 128 * 256 * 512 bytes = 256 MB
To specify a sector we need the information about surface number, track number and sector number within a track. Surface number needs 4 bits as there are 16 surfaces(24), track number needs 7 bits as there are 128 tracks(27) within a surface, within a track the sector number needs 8 bits as there are 256 sectors (28). Total number bits needed to specify a particular sector = 4+7+8 = 19 bits. Hence option A is the answer.
256 Mbyte, 19 bits
256 Mbyte, 28 bits
512 Mbyte, 20 bits
64 Gbyte, 28 bit
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