Q4: Disk controllers map logical blocks to physical locations on the disk. Suppose that a 10MB file consisting of 1024-byte logical blocks is stored on a disk drive with the following characteristics: Rotational rate: Average seek time: Average sectors/track: Surfaces: Sector size: 12,000 RPM 8ms 1024 8 1024 bytes Suppose that a program reads all the blocks of this file sequentially, and that the time to position the head over the first block is the average seek time plus the average rotational latency. 4a) What is the best case for mapping logical blocks to disk sectors? Estimate the time required to read the file in this best-case scenario. 4b) Suppose that the logical blocks are mapped randomly to disk sectors. Estimate the time required to read the file in this scenario

Computer Networking: A Top-Down Approach (7th Edition)
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Q4: Disk controllers map logical blocks to physical locations on the disk.
Suppose that a 10MB file consisting of 1024-byte logical blocks is stored on a disk drive with the following
characteristics:
Rotational rate:
Average seek time:
Average sectors/track:
Surfaces:
Sector size:
12,000 RPM
8ms
1024
8
1024 bytes
Suppose that a program reads all the blocks of this file sequentially, and that the time to position the head over the
first block is the average seek time plus the average rotational latency.
4a) What is the best case for mapping logical blocks to disk sectors? Estimate the time required to read the file in this
best-case scenario.
4b) Suppose that the logical blocks are mapped randomly to disk sectors. Estimate the time required to read the file
in this scenario
Transcribed Image Text:Q4: Disk controllers map logical blocks to physical locations on the disk. Suppose that a 10MB file consisting of 1024-byte logical blocks is stored on a disk drive with the following characteristics: Rotational rate: Average seek time: Average sectors/track: Surfaces: Sector size: 12,000 RPM 8ms 1024 8 1024 bytes Suppose that a program reads all the blocks of this file sequentially, and that the time to position the head over the first block is the average seek time plus the average rotational latency. 4a) What is the best case for mapping logical blocks to disk sectors? Estimate the time required to read the file in this best-case scenario. 4b) Suppose that the logical blocks are mapped randomly to disk sectors. Estimate the time required to read the file in this scenario
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