There are files on both D:, which is my external drive, and E:, which is the SD card.
The files on D: are the originals that I recently downloaded, now mostly in .flac format. There are 398 of these, last I checked. They have never been added to my library. However, the folders PHC1of 3, etc no longer exist. Everything has been merged into A Prairie Home Companion, organized in folders by individual date.
The files on E: are all MP3s, some converted from the files on D: (but not everything on D: is on E:) and others I acquired elsewhere. There are 620 of these, organized in folders by year. These are the ones that i was trying to organize originally, And now can't find in the library. It is definitely still E:.