After restoring my Mojave backup, after restarting my screen stays black for about 40 seconds before the apple appears. This was strange, so I rebooted with the option key held and now see both Macintosh HD and Macintosh HD2.
Booting into either gets me to the same place, so there’s really just one disk. (I moved a file from Downloads to Desktop in one and it was in Desktop in the other.)
Could the unusually long black screen on startup be caused by the Mac trying to figure out which one it should start from? I’m concerned that if I don’t fix this now, there could be trouble ahead.
Here’s how I got to this point:
Before upgrading to Catalina, I did a full backup with SuperDuper. I then found a few issues with Photoshop printing and my display calibration gear, so decided to go back to Mojave and wait a few months.
SuperDuper instructions said to:
- Open Disk Utility
- Choose “Show All Devices” from the View menu
- Select the destination drive hardware (above the container and volume)
- Click Erase
- Choose “GUID” partitioning, “APFS” formatting and name appropriately
- Click Erase
- Then restore with SuperDuper
I worked with SuperDuper support on some problems with doing this, and was finally told to erase the drive using “diskutil resetFusion” in Terminal.
This worked and let me restore, and all is working fine except for this Macintosh HD2 that has appeared. I booted into Recovery Mode and Disk Util shows this:
The top Macintosh HD is a Logical Volume Group
The indented one under it is a Logical Partition.
Here’s how it looks when I’m not in Recovery mode:
What should I do?