Are you talking about a virdis 'drive' as a virtual drive on your pc's hard drive, or an actual hardware external drive you connect to your vs?
Are you saying that you've done a defrag of this hard drive using windows defrag (or some 3rd party windows defrag) tool?
I'm thinking that if windows doesn't write files to that hard drive in the process, that the vs would have no issue with it - if you're asking.
But if you haven't tried it yet, it might be advisable to make a copy of the virdis virtual drive(s) and store it/them on another hard drive first, just to be sure in case the vs doesn't like the result.
Loc: Galveston, Texas, USA
Unless a VirDIS HDD file has been utilized as a 'true' hard drive (which, of course, it IS as far as the Roland is concerned) and its contents 'worked on' frequently by the Roland user, there should be NO reason to defrag such a file. If such an HDD file has just been used to copy over Songs/Projects, then NO fragmentation has taken place at that point.
From a Windows viewpoint, of course, the HDD file is just that - a regular file and not a candidate for defragging.