A disk has the following specification: - Number of bytes per sector = 512 - Num

Question

A disk has the following specification:

- Number of bytes per sector = 512

- Number of sectors per track = 512 (new)

- Number of platters = 12, each platter with 2 surfaces

- Number of cylinders = 8,192

- Spindle speed = 10,000 rpm

- Average seek time = 10 milliseconds

- One cluster has 8 sectors. (new)

New info:

A file has 75,000 fixed-length data records. Each record has 256 bytes.

What is the transfer time for one cluster in milliseconds?

a. 0.077 millisecond
b. 0.094 millisecond
c. 0.127 millisecond
d. 0.089 millisecond
e. 0.188 millisecond

Explanation / Answer

Ans is b

Transfer time=(number of sectors to be read/no of sectors per track)*(60000/rpm)

=(8/512)*(60000/10000)

=0.09375

=0.094

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