I think the thumbd.db are probably made by windows
You can safely delete them but they might come back
You can turn them off
http://www.annoyances.org/exec/show/article03-204
Quote:
Main reason why I want to save as much as possible - I need to learn for the future, so I know what I'm doing if something happens when my library has thousands of books.
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Best practice is AFAIK to copy entire library regularly (and to a separate device/computer every so often as well)
Hard drives do fail and I at least do something idiotic periodically
Helen