mac os big sur update cannot read external hard disc?

Ignore that last comment. I was not familiar with the layout of the Disk Utility Window.

You need to "Show all Devices" and select the Device to Erase/Reformat.

I have not had to erase/reformat a disk in 10years; only repartition.

Hey derek03,

It sounds like you're having an issue using external drives with your Mac. We can understand wanting to get that resolved. We want to help.

We'd recommend reviewing the information in this article: Use external storage devices with Mac

Thanks!

I just got an M1 Mini which was updated to 11.2.3 almost as soon as I started it.

I am now trying to format a new 1 TB external drive, but I am not being offered GUID partition map format.

The normal HFS (journaled) will not allow me to portion the drive!