Mac mini or OS issue?

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May 21, 2012
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Rhode Island
Your Mac's Specs
M1 Mac Studio, 11" iPad Pro 3rdGen, iPhone 13 ProMax, Watch S7, 2018 15" MBP, AirPods Pro
Attached to my 2014 Mac mini, I have an external 1TB hard disk drive that I have partitioned into 5 partitions. It has partitions of Yosemite, El capitan, Internet Recovery (El Cap. also), Media, and Macintosh HD clone. The issue happens when I boot into Yosemite and then want to boot back into Sierra. When I go to System Preferences > Startup Disk, both the internal SSD with Sierra, and the external clone of Sierra do not show as available boot options.

I have to boot into El Capitan (or Internet Recovery) partition to see Sierra as an option. Does this sound right?
 

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