If it’s not formatted in APFS, then you have almost certainly identified your issue. Boy, did I feel silly finding this out.
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What format did the drive use? HFS+?
I honestly promptly forgot, but it looks like they come as ExFat. It’s a 4tb Sandisk Extreme Pro ssd.
ExFAT does make sense, since it’s the only filesystem which supports read and write on all major OS. Sadly it’s also pretty basic, and thus not the first choice on any OS - except for USB sticks.
I generally recommend formatting any new storage media before using it. Just to make sure it’s properly formatted to work with my machine, and the manufacturer didn’t mess up their implementation for some reason.
