import os
def main():
    s=0
    if os.name == "nt":
        while True:
            if read_sector(r"\\.\physicaldrive0",s)=='':
                break
            else:
                s=s+1
            print(s)
    else:
        while True:
            if read_sector("/dev/sda",s)=='':
                break
            else:
                s=s+1
            print(s)
def read_sector(disk, sector_no=0):
    f = open(disk, 'rb')
    f.seek(sector_no * 1)
    read = f.read(1)
    return read

if __name__ == "__main__":
    main()