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I had an issue recently where my usb drive was “disconnecting” which triggered unraid to give read errors and then panicking. I had checked though and it wasn’t being regularly read or written to but still caused my whole server to crash. Changing usb drive has since fixed it, for now 😄
I’ve heard smaller, older drives are actually more reliable in the long run. USB 2.0 especially because of the lower speed causes less heat