Using 80min CDR as 74 Min?

[tonyb]

I have an HP CDWriter which recognises 80min CDRs but will only write 78mins and a bit. When using the backup programme it thinks it can write a full 80 mins of data but bombs out at 78mins and a bit. I know I can buy 74 min CDRs but these are now a lot more expensive! (I did buy some 80s by mistake!).

Is there any way of writing something to the 80min CDRs to make the CD Writer think they are 74 mins or have used the latter 6mins of the disk?

Any help would be appreciated.

Tonyb