Goal: Virtual disk to sync file sets with drives of different sizes

Have 3 sets of matching data: 1 set on 12GB drives, 1 set on 6GB drives, and 1 set on 2GB drives.

Would like to do a synch check by comparing file name/date/size of contents of 2-6GB to a 12GB drive and the contents of 3-2GB to a 6GB drive.

Would like to create a temp, virtual drive/folder of the 2-6GB drives (or 3-2GB drives) so I can use a synch program to do the compare.

Any thoughts?

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Asked this over in the sevenforums a couple of days ago since I plan to do this on a Win7 box, but no reply. I have vague memories of some software that could do creation of a virtual drive from multiple physical ones, but haven't been able to google it up. Almost like Library, but Library would not quite work here.

Samuria said:

The problem is on different disk files may not show the same size due to file structure.

Don't understand this. File structure is same on all drives, so intuitively File A should show same size no matter physical drive size. Not talking about physical space actually taken on the drive which I do know will be different.

I do not want an automatic sync of drives, just report of differences. Most of the time in the past, discrepancies have been caused from manually copying a file into the wrong directory.

In the past, have taken Dirs of folders, merged appropriately then put into a spreadsheet to compare. With other data, the 3 sets are on same sized drives and I have an antique utility where I can just select a drive or folder on 2 of the 3 copies and run a compare - that's what I'd like to do here. I never have all 3 copies running at the same time.

The compare software does not look at physical file size, so cluster size difference is irrelevant. I just need something that will effectively give me the combined Dirs as a drive or folder.