ShirtPocket clone doesn't show up as a bootable volume
I have several copies on different storage media that work fine as bootable backups. These are made with identical SD options. ONE copy, to ONE particular partition on ONE particular drive (as it turns out, a WD rotating hard drive) seems to copy successfully, but then it simply doesn't show up as a bootable volume in "Startup Disks", or when I try to do an external startup using Startup Options. I repeat the copy over and over and, same deal each time. No problem with an identical partition on the same drive. What's up with that?
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