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					Originally Posted by theducks  We are not talking corruption at the filesystem level (what RAID fights).
 Calibre does many file and database entries that MUST remain in lockstep.
 Also 2 simultaneous users might cause a clash as the write is from a memory version (and the other has no way of knowing things changed).
 Calibre is not a true Client - server app.  There are no File - record lock type interactions.
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 Ah, it's not a true server/client.  That helps to make more sense.  Thankyou for the clarification! 

 Appreciate it.