> In ibconfig, add as many separate lines as you have directories defined,

in the order that you want them used:

> tmp_directory 6000000 "d:\fbtemp"
> tmp_directory 12000000 "f:\fbtemp"
> tmp_directory 4000000 "w:\aladdin"

I thought that if you didn't include hte last \ it barfed, am I wrong?
i.e. "w:\aladdin" -> "w:\aladdin\"
plus they must be less than 2GB in size, otherwise a 2GB sort would break.

just my 2c

JAC