HDD MP3 directory structure in Columbus unit?

I've loaded about 2500 MP3 files onto the HDD of my Columbus unit but I've noticed that the file structure I have used (ROOT > Fred's Music > Artist Name > Album Name > MP3 tracks) doesn't seem to be recognised properly. The Columbus unit lists the MP3's as Artist > MP3 tracks, so the albums are jumbled up and they play out of sequence rather than by album order. I can't see a way to correct this, anyone else noticed this on their unit? The only solution I can see is to reorganise the folder structure as ROOT > Fred's Music > Artist+Album Name > MP3 tracks.

Edit - The Columbus reads an SDHC card with the exact same files correctly. I'll use the SDHC card in preference to the HDD now.

Edited 24 December, 201114 yr by Fred Bloggs