Hi Squashman and Salmon Trout - thanks for your kind help. Here are more specifics. The drives would both be large external USB drives. I would at least like to search by name (it would be even more ideal to be able to search by name, size, date....but name and size would be sufficient). I have many drives with various media files (many many thousands) on them. I am trying to consolidate the files on to one 3TB drive. I simply need to be able to do a search to see what files are on Drive E for example, but that are not on Drive F. Then I want to be able to copy those files on Drive E, as a group, onto Drive F. That will be a step in the process of consolidating my 500,000+ media files. The Unix route sounds complex, but I will try anything. I just need detailed instructions.Thanks again.