I am on osx.
I did put in the trash my old system files that I had keep in backup (on an external drive) when I have swith to mac osx... you know... just in case...

No that I don't need them anymore, I have put these files in the trash. They are still there because every time I empty the trash, everything delete but these files... probably because they are seen as system files...

HOW CAN I DELETE THEM ??

PS : And by the way, on osx, is there a way to acurate the speed of the drive. On os9 we were doing scan disk and optimising disk... Sometihing like this on osx ??