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When we do mount -o loop filename.iso /path/to/mountdir, is twice the memory required to store the files? If no resources are used, can I mount hundreds of ISOs at a time? As in, is it like a softlink to original files or a copy of files in ISO?

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It's just a mount point and it means that it is a window to see your files. The mount point is a connection point which connect the system to a resource..so it doesn't consume any resources, but the directory that you connect to the mount point will become unused for the system until it holds the mounted device, even if it has data inside.

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Some (kernel internal) resources are consumed, so you can't do this with thousands of images with impunity. –  vonbrand Apr 1 '13 at 14:08
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