Ouch, do you really need that many Volumes?
Is it correct to assume you have one Volume for each VM? Are these Bootcamp VMs?
1. If these are Bootcamp VMs the problem is probably in how Parallels enumerates disks and slices which might change between boots, Parallels, unfortunately, doesn't uniquely and permanently identify a drive and might see a different order each time.
Create a support request directly with Parallels Support stating these facts.
2 .If they aren't Bootcamp VMs but virtual disks they can be all in the same Volume.
Anyway, I think the problem is in disk enumeration in Parallels.
Last edited: Dec 14, 2011