#include <stdio.h>

int main(void) {
    const double rpm = 7200.0;
    const double full_rotation_ms = 60000.0 / rpm;
    const double avg_seek_ms = 9.0;
    const double settle_ms = 1.0;
    printf("Hard Disk Drive Access Time Simulator\n");
    printf("=====================================\n");
    printf("RPM: %.0f, Full rotation: %.2f ms\n", rpm, full_rotation_ms);
    printf("Average seek: %.1f ms, Settle: %.1f ms\n\n", avg_seek_ms, settle_ms);
    double random_access = avg_seek_ms + settle_ms + 0.5 * full_rotation_ms;
    printf("Typical random I/O time: %.2f ms\n", random_access);
    printf("Sequential transfer much faster due to no extra seeks/rotations.\n");
    int current_track = 0;
    int target_track = 100;
    double seek_time = 0.08 * (target_track - current_track) + settle_ms;
    double rot_delay = 0.3 * full_rotation_ms;
    double total = seek_time + rot_delay;
    printf("\nExample request: from track %d to %d\n", current_track, target_track);
    printf("Seek time: %.2f ms, Rotational delay: %.2f ms, Total: %.2f ms\n", seek_time, rot_delay, total);
    return 0;
}