I've got a bunch of Mac disk images (.dmg files) that are 100 GB or larger. I'm currently on an iMac with a few hundred gigabytes of free space, but I'm going to be moving to a Mac laptop with 128 GB storage.
So, I'm wondering, would that be a problem when I have less than 100 GB of free space on my computer, but I'm opening a disk image larger than 100 GB? My guess would be no, but is ANY space on the internal drive used at all when mounting an image?
How exactly does mounting an image work, does it just change the way the operating system sees the files as one file (the disk image) rather than the actual files within the disk image, until it is mounted? Therefore, no internal space is necessary for the mount operation?
Follow-up question: Is it any slower to read from a DMG on an external drive than it is to read from any other files on the same external drive? Basically, is there any performance hit from having files in a DMG?