[Tutor] Hard Drive wipe

[Chad Perry]

#The function for writing random data to the disk.
def random():
    print ""
    os.system("/sbin/fdisk -l")
    print ""
    print "Please choose a device to kill.  Remember if you want to"
    print "wipe the whole drive and not just a partition, you can"
    print "remove the number appended.  Example /dev/sdc1 becomes /dev/sdc ."
    print ""
    device=raw_input("Enter device: ")
    print ""
    count=input("How many times would you like to wipe the device? ")
    print ""
    print "Writing changes to disk.  All data on %s will be lost."%(device)
    print ""
    raw_input("Press Enter to continue, or Ctrl+C to exit: ")
    print ""
    lap=1
    for i in range(count):
        print "Processing wipe count %s of %s..."%(lap, count)
        os.system(("dd if=/dev/urandom of=%s")%(device))
        lap=lap+1

I need to know how to substitute for the drive letter for the following drives.

sad-sdp
also will need to wipe data from /dev/md1

I believe that the script is sound just sub's