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copied!<p>There is no way to know if a file move or copy will guaranteed succeed or not.</p> <p>But you can check quite a few things to see if it will fail:</p> <ul> <li>Check for disk space at the destination location (you need at least the size of your file)</li> <li>Check for a file that already exists at the destination location</li> <li>Do a file open, requesting read access on the source file to make sure 1) you have permissions to it, 2) it is not in use.</li> <li>You can read the entire source file to make sure there are no locks inside the file. </li> <li>A trick used by windows explorer when copying files (or moving across volumes) is to first create a blank file, then to extend the file to the full size. Only after the file is fully allocated, then writes start to happen into the file. </li> <li>Allocating a file the size of the data you want to copy over will also tell you if there is a filesystem quote in place as well that has been reached. </li> <li>If a file is in use, and you want to go this far, you could use Volume Shadow Copy (VSS).</li> </ul> <p><strong>More on file locking:</strong></p> <p>Please see my answer here for much more information on <a href="https://stackoverflow.com/questions/575328/fcntl-lockf-which-is-better-to-use-for-file-locking/575349#575349">file locking & permissions in linux</a>.</p> <p>Please see my answer here for much more information on <a href="https://stackoverflow.com/questions/203837/can-i-simply-read-a-file-that-is-in-use/203839#203839">file locking & permissions in Windows</a>.</p>

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