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<span id="Using-ddrescue-safely"></span><h2 class="chapter">3 Using ddrescue safely</h2>
<span id="index-using-ddrescue-safely"></span>
<p>Ddrescue is like any other power tool. You need to understand what it
does, and you need to understand some things about the machines it does
those things to, in order to use it safely.
</p>
<p>Never try to rescue a r/w mounted partition. The resulting copy may be
useless. It is best that the device or partition to be rescued is not
mounted at all, not even read-only.
</p>
<p>Never try to repair a file system on a drive with I/O errors; you will
probably lose even more data.
</p>
<p>If you use a device or a partition as destination, any data stored there
will be overwritten.
</p>
<p>Some systems may change device names on reboot (e.g. udev enabled
systems). If you reboot, check the device names before restarting
ddrescue.
</p>
<p>If you interrupt the rescue and then reboot, any partially copied
partitions should be hidden before allowing them to be touched by any
operating system that tries to mount and "fix" the partitions it sees.
</p>
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