This question already has an answer here:
Note: While I agree that this question basically is a duplicate of the above question, I feel @alienth's answer (below) is more concise, so I suggest you take a look at it before going to the other question.
I periodically backup/image/clone my entire ubuntu system drive to another drive with:
dd if=/dev/sda of=/media/disk1/backup.iso
It works great when I need to restore the drive after an experiment, drive failure, etc.
However I'd now like to mount a partition from within that .iso (i.e. what would have been /dev/sda1 when I was dd'ing the drive). If I'd backed up with:
dd if=/dev/sda1 of=/media/disk1/backup.iso
then the .iso would be easily mountable using ubuntu's mount volume utility. But the utility doesn't work for an iso of the entire drive. Is there a way to just mount sda1 from the original iso?