Which Fan for overheating hard disks

[Lordy]

On the inside front is another panel which forms the front wall of the
tower, to which the bays are hung. This proves to be metal by touch. I
believe if we take away the inch thick front plastic portion entirely,
what's exposed will be the upright side of the metal box, the upper part
of which has punctured pieces which we remove to install CD-ROMs.

Its that inner metal bit that *may* have holes for a large fan - esp. if
there is a gap/hole underneath your case to let air in ...

*If* it does - then thats an ideal position for a fan and it will help suck
cool air into the case and blow it over your HDs too! More beneficial than
buying HD coolers etc.