I unintentionally created a "Volume Group" when restoring to my boot SSD (did something the wrong way I guess - highly confusing for me)

I intended for the structure to be the same as the (no longer current) external copy.

I would appreciate advice on how to correct this without losing my data and system files and what exactly transpired. I couldn't choose the root/volume level when making the restore - had to choose either the "iMac191 SSD_512MB" or "iMac191 SSD_512MB - Data" and wasn't sure which one would be restored.

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  • 2
    Looks normal to me. Does your Mac boot correctly and with all your data visible?
    – Gilby
    Commented Oct 16, 2023 at 20:57
  • I just booted from the external drive to compare the arrangement and sighed relief. It's exactly the same when booted from.
    – John
    Commented Oct 16, 2023 at 21:08

1 Answer 1


For the MacOS boot disk, this is normal. The "Volume group" for the boot disk consists of the base operating system and a "data disk". This is an intentional design to provide better protection from corruption (accidental or otherwise) in that most applications cannot write to the non-Data disk.

This design also generally allows for faster OS upgrades.

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