Update Finder Preferences to show external drives.Connect the USB device to its own power source, if possible.Check your USB connections for a snug fit or frayed cables, missing pins.If using a hub, try using a different port on your Mac for the hub or plugging your external drives directly into the Mac.Quick Tips Follow these quick tips and get your Mac to recognize and mount your external drives External Drives Very Slow after macOS Update?.Does Your MacBook Shut Down When You Plug In Your External Hard Drive?.Terminal commands not working or seeing “operation not permitted” in macOS Mojave and above?.External hard drive won’t mount in macOS High Sierra or above?.Prototype Apple products are really neat. The plastic is smooth and shiny instead of pitted like is normally found. On another note, I also have a IIcx prototype, missing product name on the front of the case, rear of case, and no serial number at all. I have a suspicion that some products might have had sub stages inside those 3 official stages. There are usually 3 stages of prototypes described, EVT, DVT, PVT. One that was done, likely people just got to “take it home” and they went to being home-used. I was told by a former Apple employee that they would take their late stage prototypes and send them to training centers across the US in advance of the launch, so that employees would know about it when customers started phoning in needing help. I have two Macintosh LC prototype machines, identified by no name on front, no serial number on the case, no FCC/copyright, the power supply is slightly different on one, and motherboard serial number is really really low (like 000004 for example).
The seller is in San Jose so a good location for a prototype to find it’s way to public hands.
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