When selecting the Erase button on the top of the Disk Utility window, you should see a popup window similar to the one shown below. Note: This answer assumes the reader does not have a Fusion drive. As I was new to APFS and its partition scheme, it seemed later a better thing to have done was 'Show devices and then erase the device at the top of the hierarchy and I wonder if what I did helped created this mysterious Update volume ?Īnyway what is this volume and can it be safely deleted ? I followed Apple's instructions about erasing an APFS disk prior to installing High Sierra, but these instructions seemed incomplete in hindsight as they suggest just erasing Macintosh HD if other partitions are not available. My guess is it is created as some sort of temporary volume to do with the installation and it should not be there afterwards? I can find virtually no reference to this happening online anywhere. The volume is mounted normally and not hidden. The install seemed to go fine but a curious extra volume appeared on the Desktop after the install called 'Update' which seems to contain NVRAM and firmware related files. I erased the disk and installed High Sierra as I need to run some old software. I recently got a 2018 15 MBP with Big Sur on it. This is a spin off from another question.
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May 2023
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