Simple Tool to Detect Bad Disks by Filling with Random Data

 The number of hard disk produced in the last five years is huge. Of course,
 this is the same number of hard disks that will most probably fail in the next
 five years, possibly with catastrophic consequences for the particular user or
 business.
 .
 The simple tool disk-filltest can help, together with S.M.A.R.T. monitoring, to
 check disks periodically and thus be forewarned about coming failures. The
 function of disk-filltest is simple:
  * Write files random-######## to the current directory until the disk is full.
  * Read the files again and verify the pseudo-random sequence written.
  * Any write or read error will be reported, either by the operating system or
    by checking the pseudo-random sequence.
  * Optionally, delete the random files after a successful run.