The storage area of a disk has innermost diameter of 10 cm and outermost diameter of 20 cm. The maximum storage density of the disk is 1400bits/cm. The disk rotates at a speed of 4200 RPM. The main memory of a computer has 64-bit word length and 1us cycle time. If cycle stealing is used for data transfer from the disk, the percentage of memory cycles stolen for transferring one word is_

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