Dave, I don't have experiences with HD recording units, but if you can attach the scsidevices of the Roland to an scsi chain I would hook it on your PC. I know Fran has a setup like that, so you could ask him how he did that, as your scsi card and your Roland will both wanna have control over the HD units. There's a way to solve it, but I cannot recall this by head.
Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76