What did you end up doing? I'm facing the same problem with the greyed out disk1s7 and an Update partition as well.
dkdkdk
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
From
Cupertino, CA, United States