To initialise the Hitachi HDR253 hard disk drive
MENU >> Setup >> Recordings >> Format disk (the default PIN is 0000)
When you format the disk you will lose all your recordings. However, this has already occured and is probably due to a disk index corruption rather than a fault with the hardware.
The Hitach HDR253 is a T825 model made by a company called vestel. For additional trouble shooting also see the digihome forum at digital spy
http://forums.digitalspy.co.uk/forumdisplay.php?f=171
NS
January 2013