I'm going to be installing a 250GB SSD in my MacPro, which currently has a startup volume (HDD) and a Data volume (also HDD). A simple configuration would be to replace the startup volume with the SSD and continue with the HDD as my Data volume. BUT, there are files (such as a 30GB Windows virtual machine and frequently accessed files such as Lightroom catalog) that might really benefit from being on an SSD. I know it's feasible, but would be advisable to create a DIY Fusion drive and just use one (logical) drive, or manage two separate drives (SSD and HDD) myself so that I manually put the things I'd want on the SSD there and leave the less often accessed items on the HDD? Thanks for your advice.