J River duplicate music files, where are they?

Your PC treats partitions the same way as it does drives. So, if you have 1 hard drive with 2 partitions, your computer will treat them as 2 separate drives. Either you have partitions on one, or both of your hard drives that you may not be aware of, or one of your applications created a virtual drive for some reason.

I'm guessing that in your case, the extra/virtual partition is used for meta data (Tags), and not for the actual music files themselves.

With a PC, your D:\ should be a recovery partition on your
Primary hard drive or a CD/ DVD drive. A click on My Computer or This PC may give more clues. Open D: then minimize that window, open E: then restore the D: window and click on a couple of songs from each window and see if they play.

Jsd52756, you might want to post this question on jriver's Interact, its user forum. http://yabb.jriver.com/interact/index.php It is a very active group.

I'm confused about your E drive. JRiver MC does not make duplicate copies of your music files, but reads them from whatever location you designate. Its library does not work like iTunes.

I could not find any sign of an E:/ drive anywhere. 90% of the time I listen to 100 rendom songs in playlist. When I enter play 100 random songs 1/2 of them are on the E:\ drive the other 1/2 are on my externat D: drive. All songe are duplicated. Don't know what I did, but I would sure like to undo my doing...
-John