In our test, we created a bootable external hard drive clone of the internal startup drive using ASR.ĭrawbacks to this external bootable drive are the required initial boot-up check on the first startup. This feature creates a Signed System Volume with exact copies of all files with valid cryptographic signatures. We found a workaround to our problems using one of Apple's utilities called Apple Software Restore (ASR). While it still works on most Intel computers, on Apple M1, we were left searching for a suitable solution for our users to have a bootable clone of their internal drive. We called this bootable external hard drive our Bootwell™ drive. In the past, we were able to create a stripped-down version of macOS and allow users to boot into it. We are not able to replicate or have a perfect workaround to this change.
At this time, Apple is the only one capable of creating a Signed System Volume. The new addition prevents any external media from being bootable without a Signed System Volume. Close to impossible on customized macOS Big Sur and Monterey given the introduction of Apple's Cryptographic Signature Technology known as a Signed System Volume. However, it has become strenuous to get a bootable clone of your internal startup drive in recent versions of macOS. There have been several ways to create a bootable external drive of your internal drive for many years on macOS.
How to create a bootable external hard drive on macOS (Big Sur, Monterey) November 30, 2021
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