Why are my raster datasets invalid when I move them to a new folder?

[EllenWildig]

I'm trying to display .ers tiles, but every time I try to pull them into the map and error message appear saying invalid raster dataset and they fail to display. I have the same files stored in another folder and these work fine. I tried to copy the working files in, to replace those which won't, however once transferred into the same folder, these won't work either. As far as I can tell the auxiliary files aren't corrupted so I have no idea what's causing it. There are also .tif files on the same folder which work fine.

Anyone experienced similar problems or know how to fix this?

Thanks

[NeilAyres]

Have a look at the data using Catalog and the normal file explorer first.

Is the path to the data that doesn't work complicated? Got spaces in it? on a remote server? etc

I am trying to recall how the *.ers file works. Is it a pointer to another file which contains the actual imagery?

Look at the properties page in Catalog, and see the files involved using the file explorer.