The most important thing is to get Photoshop up and running at a
speed which doesn't have me wondering the number of angels on a
pinhead thing. Admittedly my former system wasn't really up to
Photoshop but I want mega increases in every aspect of it -
processing images, finding them, opening them - everything!
Partitioning a single physical hard drive will not help particularly much -
again - one read or one write command to the single physical device at any
given time.. So even if your pictures are on the D drive (partition 2) of
the one physical hard drive you have, whenever it is using swap to tell
photoshop what to do next on the C partition, it has to wait to access the D
partition.
Two hard drives.. One for OS/Applications - partition it how you want..
Put your photoshop image files and photoshop scratch directory on the OTHER
hard drive.
