Thanks to Al and j.... for your comments.
I have to say that I'm still a little confused as to whether
partitioning can provide any performance boost at all. Indeed, Al's
post seems to suggest that the type of gain I had been expecting is
unlikely.
Nevertheless, I was referring in my first post to the freeware program
Partition Logic whose home page is here: http://visopsys.org/partlogic/
While I have seen a number of threads in the NG about this product, I
have yet to see any that were "singing its praises".
Has anybody got anything good to say about Partition Logic?
TIA
Paul