Running lightroom catalog on an MS-DOS drive

I need to create a cartalog that both PC and Mac users can access.
I created the catalog (LR 3.4.1) and loaded the pictures on my mac, then copied the entire folder (previews, catalog file, pictures and all) to the MS-DOS drive, but when I open the catalog, though the previews are visible, the catalog is trying to find it on the mac drive.
So I thought I'd try creating a new catalog on the external drive and reimport the pictures in-situ, but when I choose import, the import dialog shows no pictures at all, though I can see the pictures in Finder on the external drive.
Anyone got a solution to this or another way I can have a Lightroom catalog accessible from both Mac and PC?

natcarish wrote:
sorry, 'it' being the catalog. I've got the whole catalog copied to the MS-DOS drive, then double-click on the lrcat file on the external drive, but instead of sourcing the pictures on the MS-DOS drive it looks on my internal OSX drive for the data in the catalog
The external drive has a different naming than on the Mac system, which leads to missing images when you switch to the mac. There are two options to solve this:
On the windows system, move the top-level folder(s) with the originals into the folder on the external drive where the catalog resides (do this using Lightroom!!). This makes them acessible via a relative path from the catalog, which is valid both on Windows and Mac
Do a "Find missing Folder" for the top-level folders when the catalog is open on the Mac, pointing to the folders on the external drive.
But you would have to do this everay time you switch between Windows and Mac and vice-versa.
Beat

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Adobe Acrobat Reader is the reason for Adobe Acrobat (the creator) success.
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Running lightroom catalog on an MS-DOS drive

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