According to published estimates² the Large Synoptic Survey Telescope (LSST) will generate 1.281 petabytes of uncompressed astronomical observation data per year. If all this data is stored on hard drives having a capacity of 4.0TB each, how many of these hard drives will be required to hold eight years worth of data generated by the LSST? (Note: You may NOT use your calculator for this exercise.) show all your working and steps .