 * Added more well known keys to the extended key file.
   (extended-std.keys file will be updated automatically.)
 * Bugfix: Ignore saved default sector range for the
   factory format function. Thanks to David "baudav" Baumann.
 * Bugfix/Workaround: Try to write block twice, if needed.
   Thanks to "btwang0512".
 * Some minor code cleanup.
