You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

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

Old drive OS can’t be read on new computer.

My 2010 iMac capped out at High Sierra and eventually became unmountable. Got newer iMac today with Big Sur. Got a docking station to use old SATA 3.5 drive from the old iMac as external drive to transfer old data to new comp, however starting comp and holding Option to list both drives results in a circle icon with diagonal slash when opening the old drive which means the Big Sur OS is not capable of working with the High Sierra? Does this make sense? Results from a search-

“If your Mac starts up to a circle with a line through it

A circle with a line through it means that your startup disk contains a Mac operating system, but it's not a macOS that your Mac can use. 

A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.”


How can I move the old data to the new comp?

iPhone 12 Pro Max

Posted on Sep 26, 2023 10:56 PM

Reply
Question marked as Top-ranking reply

Posted on Sep 28, 2023 1:57 AM

If your Mac starts up to a circle with a line through it - Apple Support



The article tells you what to do. Note the last line, and link, about contacting Apple Support

Similar questions

3 replies

Old drive OS can’t be read on new computer.

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.