Computers and Technology
Computers and Technology, 10.09.2019 01:30, mzynique2000

Differentiate between rotational delay and seek time

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Computers and Technology, 11.09.2019 02:20, leannaadrian
Differentiate between rotational delay and seek time
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Computers and Technology, 26.10.2019 01:43, orangeicecream
The megatron 777 disk has the following characteristics: 1. there are ten surfaces, with 100,000 tracks each. 2. tracks hold an average of 1000 sectors of 1024 bytes each. 3. 20% of each track is used for gaps. 4. the disk rotates at 10,000 rpm. 5. the time it takes the head to move n tracks is 1 + 0.0002n milliseconds. answer the following questions about the megatron 777. a) what is the capacity of the disk? b) if tracks are located on the outer inch of a 3.5-inch-diameter surface, what is the average density of bits in the sectors of a track? c) what is the maximum seek time? d) what is the maximum rotational latency? e) if a block is 65,546 bytes (i.e., 64 sectors), what is the transfer time of a block? f) what is the average seek time? g) what is the average rotational latency?
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Computers and Technology, 02.11.2019 04:31, leo4687
Consider a disk with sector size of 512 bytes, 1000 tracks per surface, 50 sectors per track, five (5) double-sided platters, and average seek time of 8 msec. supposed that the disk platters rotate at 7400 rpm (revolutions per minute). supposed also that a block (page) of 2048 bytes is chosen. now, consider a file with 150,000 records of 100 bytes each that is to be stored on such a disk and that no record is allowed to span two blocks. also, no block can span two tracks. a. how many records fit onto a block? b.how many blocks are required to store the entire file? if the file is arrange "sequentially on the disk, how many cylinders are needed? c. how many records of 100 bytes each can be stored usin this disk? d. what time is required to read a file containing 100,000 records of 100 bytes each sequentially? you can make an assumption about how long it takes moving the heads from one cylinder to the next here. e. what is the time required to read a file containing 100,000 records of 100 bytes each in a random order? to read a record, the block containing the record has to be fetched from the disk. assume that each block request incurs the average seek time and rotational delay. you need also to include the transfer time for each block.
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