I think that this has been discussed in the past and the conclusion, if I remember correctly, was that the formatting of the drive is proprietary and that it isn’t possible to do. Pity.
It has been discussed but not conclusively. I haven't had time to dig into it further, but I don't believe it's a ground-up custom filesystem as that's a huge undertaking. Chances are it's something suited to embedded usage for whatever the underlying operating system is. QNX? A more modern Linux flavor?
A clean slate would probably not suit the instrument's needs. You'd have to recreate whatever was on the original drives which includes the full factory sample set - and that starts to get into thorny territory with 8DIO's licensing of these samples, which could well be why Sequential hasn't had anything to say on the subject.