Thank you for helping, ironsoul.  My intent was to use one HD for OS and program files, then add a second HD (D) for my Poser scene files and Silo/modo model build files, and probably a third for archival storage (content zips, software downloads, etc)

     Yes, I am aware of the static issue;  I even have the bracelets which clamp to the chassis.

     I do intend to keep the old HDs and will put them in a quick-change external HD chassis and try to salvage what I can.  They seem to be intermittently hiccupping, rather than having a total catastrophic failure, so chances are fairly good.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5