Hi station_two.
Thanks for your message. The first two SSD drives are inadequate for what? For anything at all? Or for scratch and caches? Even the 120GB 6G SSD is big enough to serve as my startup drive with OS, apps, home folder, etc. with room to spare. Which leaves all 240GB of the other 6G SSD free for scratch and caches. ALso available for scratch and caches is whatever's left open on the 960gb Accelsior SSD (not being used by DNGs and TIFFs). I know that 240GB on its own is not enough to handle some scratch space needs, but It's rare that I do panoramic stitching; I usually have open at one time only one 36MP file with somewhere between one and six layers. I'm not claiming that what I have on my fastest drives is anywhere near enough space for scratch; rather, I'm asking for advice on how best to use the drives I do have. I should make clear that I have several TB of free hard drive space, connected via eSATA, that can serve as additional sources of scratch space.