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It seems a scary option to try casually :-/ > Never try to rescue a r/w mounted partition. The resulting copy may be useless. It is best that the device or par

• aidenn0 5y ago
  Yes, if you make a raw copy of a disk you are also concurrently writing to, you won't have a snapshot of the disk. Nothing surprising there, right? [edit] Also that section isn't talking about damaging the original disk, but rather ending up with a useless copy. If you have a malfunctioning device then using it in any way may cause further malfunctions, but in general running something like ddrescue isn't going to destroy something that wasn't already about to self-destruct anyways.