Bought to replace the built-in iMac conventional hard drive. Because I did not want to disassemble the case and stopped on an external drive connected via USB. At first, MacOS Catalina failed to format the disk so that it became bootable. But when connected to a MacBookPro with Big Sur, I managed to format it so that it had a GUID assigned, and then cloned the OS to it from the old disk. Everything started up and works great.
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