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Another day, Apple advised me to try with a completely fresh install, so I formatted my drive, installed a brand new Sonoma. I still get the error message.
 
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Typical Apple... putting it on the customer to waste their day starting from scratch when they likely know it's a problem on their end but don't care because they don't make any money supporting third-party drives.
 
Are there any updates here, can't access my Lacie 2Big anymore... reading the same issue on multiple blogs, would getting hold of an Intel Mac be worth trying?
 
Anyone brave enough to install Sequoia and see if their Lacie drive still works?

I'm not!
I did. I installed one 6big, two 2bigs and three portable drives to my 2019 iMac. And while I do have problems with Sequoia, none of them involve my external drives.
 
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