I find it far more easier to let the *producers* take care of the cataloging and indexing of the PDF's ! With 70.000 PDF's how do you know that you are actualy looking at the most reasent version each time you need it ? Without looking it up at the producers site anyway ? If you actualy look at 10 PDF's a day, 365 days/year, you'll need close to 20 years to read them all. I'll bett that at least *some* of the PDF's will be outdated by then :-) And about the Microchip CD's, don't they have some kind of search tool to read them ? Can't that tool be copied to your harddisk together with the PDF's ? Jan-Erik. Jochen Feldhaar wrote: > I have about 70000 PDFs on my PC (23GBytes, yeah!),... -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics