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Computers and Technology, 10.03.2020 00:08 calebvaughn924
16.37. Suppose that a disk unit has the following parameters: seek time s = 20 msec; rotational delay rd = 10 msec; block transfer time btt = 1 msec; block size B = 2400 bytes; interblock gap size G = 600 bytes. An EMPLOYEE file has the following fields: Ssn, 9 bytes; Last_name, 20 bytes; First_name, 20 bytes; Middle_init, 1 byte; Birth_date, 10 bytes; Address, 35 bytes; Phone, 12 bytes; Supervisor_ssn, 9 bytes; Department, 4 bytes; Job_code, 4 bytes; deletion marker, 1 byte. The EMPLOYEE file has r = 30,000 records, fixed-length format, and unspanned blocking. Write appropriate formulas and calculate the following values for the above EMPLOYEE file: a. Calculate the record size R (including the deletion marker), the blocking factor bfr, and the number of disk blocks b. b. Calculate the wasted space in each disk block because of the unspanned organization.
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16.37. Suppose that a disk unit has the following parameters: seek time s = 20 msec; rotational dela...
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