Want to highlight a helpful answer? Upvote!

Did someone help you, or did an answer or User Tip resolve your issue? Upvote by selecting the upvote arrow. Your feedback helps others! Learn more about when to upvote >

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Globalksp Author

Level 1

23 points

Mac HD [Big Sur] not showing in Catalina Installer via Recovery or Bootable USB Drive

Created a bootable installer drive on an external Samsung T7 drive connected via Thunderbolt 3 cable. Partitioned the drives with 3 OS installers: Mojave, Catalina, Big Sur.

Machine (2019 Maxed out MBP) currently has Big Sur installed.

The bootable SSD shows up in startup drives and the Catalina install process proceeds correctly until prompted to "select the disk where you want to install MacOS". The only drives listed are the drive/partitions on the external SSD. The internal Mac HD is not an option.

Thoughts?

Thanks!

Posted on Oct 10, 2021 1:07 PM

Best reply

Barney-15E

Level 10

112,926 points

Posted on Oct 10, 2021 1:52 PM

Erase it first, or add an APFS Volume.

View in context

Mac HD [Big Sur] not showing in Catalina Installer via Recovery or Bootable USB Drive

Similar questions