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Message: <blockquote data-quote="aroy" data-source="post: 470470" data-attributes="member: 16090">When the file numbers roll over, they are written to a different sub directory.I use windows copy command to transfer the files from my camera to the PC, and have yet to find any file missing or over written. This is the safest method, as you are not dependent on any software for identifying, transferring and cataloging the files.One thing that I have learnt over the last 30+ years with computers, is, that unless you have archived the files (created copies), do not delete the files. If you have not saved data you will loose it fast. With the SD/CF cards reasonably priced, it is safer all round to have extra cards, especially if you shoot a lot in a short span. Write (RAW+jpeg) to both the cards and change them once they fill up. Then when you have processed them at leisure and archived them, format then for reuse.</blockquote>