For the last year or so I've been using a 256gig SSD on a PCI card as the boot drive, but kept my 600+ gigs of user files on a much larger internal SATA drive. This has worked well enough, however it's starting to cause difficulties with some apps, since OS X now blocks certain processes viewed as cross origin, even though it's on the same computer and clearly linked. The solution it seems is to move my essential user data onto the SSD and have the system recognise that as the source of the user data. A lot of the files I have under my user could be stored on other drives, such as accounts and work info etc. I also understand iMovie for example can happily access data from other drives, so all I really want is the essential user data needed to run the system on that SSD. Is this simply a case of dragging my user's Library folder from the SATA over to the SSD and then choosing that as the user inside system preferences, followed by a restart? This would appear to be roughly 50 gigs on top of the existing 90 gigs used by the SSD, but that still leaves me with 100 gigs of space.