Target disk mode for edit and save?

I have about 40 GB worth of photoshop files on a white Macbook 2009 running Lion and I need to delete layer 1 from each file. Is it safe to start the Macbook in target disk mode, mount it on my MDD G4 (running 10.4.11) and then run a PhotoShop batch on the G4 which deletes layer 1 and saves to original location? I don't have room to move the files to the G4 and my older version of Photoshop won't run on the Macbook.

Sure, "in theory" there should be no problems at all!
However, risking the ONLY copy of your data doing a non-reversable change is just a generic "bad idea"!
Always working on copies is a general good practice.
Always!

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    <hr>
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