How to unmount a disk that thinks it's in use?

Disk Utility will not Erase a backup hard drive disk b/c "Couldn't Unmount Disk." I've been trying to Erase a backup hard drive b/c it mistakenly thinks it's full, and in another discussion I was told to run Erase in Disk Utility. No space on backup hard drive?
However, each time I try to eject disk, which is what I assume unmount means, I get error message, "The volume can’t be ejected because it’s currently in use." I get this whether I try to eject in Finder or Disk Utility. However, the disk is not in use. It has only a few files, none of which are open. No aps.
Is this a way to force an unmount, similar to a forced quit?
I have a guess as what iMac might think in still "in use: the few files on the backup disk now have alias listed in burn folder. I had earlier thought I'd save those files by burning to a CD disk. Turned out my CD disk wasn't big enough. So, I rejected the idea. Ejected disk, but burn folder remained, and no matter how I try, I can't delete or trash it. I can't remove the 5 folders on it, individually or all together. The burn folder is one of the most stubborn things I've ever come across. Could this be why I can't unmount disk and thus can't erase the disk?
Any other way to unmount or to Erase the disk?
Thanks

Hint:
when you delete files on an external disk, they will stay in the local .trash bin on that disk, and not free up the space on the disk. You have to empty the trash bin on your mac (with the external disk still connected) to free up this hidden trash bin on the external disk.
Lex

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