Files/folders from external HDD missing.

Ive just tried Volumio on an ASUS netbook X86 with no installation issues. Everything works quite well (Thank you!) except when I select
my WD Passport external HDD, the library acquires only 20% of the files. The drive has two main Folders: one for flac and one for HDflac.
The library winds up populated with only folders (albums) starting with “B” through “L” from just the flac folder. This is only about 600 files or so.
Any ideas whats amiss? Thanks.