A python program (for windows) that plays tones based on disk activity

disktone.py

import time
import psutil
import winsound

last_disk_time = None
last_time = None

while (True):
    curr_time = time.time()
    counters = psutil.disk_io_counters()
    read_time = counters.read_time
    write_time = counters.write_time
    curr_disk_time = read_time + write_time

    if last_disk_time is not None:
        ddisk = curr_disk_time - last_disk_time
        dtime = curr_time - last_time
        disk_rate = ddisk / dtime
        diff = 500 + round(disk_rate / 3000)

        print('{0: > 010n}, {1}'.format(round(disk_rate), diff))
        if diff > 550:
            winsound.Beep(diff, 200)
        else:
            time.sleep(0.2)

    last_disk_time = curr_disk_time
    last_time = curr_time

    time.sleep(0.05)

Hi Brian
Can you please explain how did you choose these constants - 500, 3000, 550, 200 in your code above?