If they are being recognized in the system, but not showing up, you may have to disconnect them and remount them in Terminal.įirst, see if they are listed. If nothing happens here (with both devices) then you have ruled out your USB devices. When you attach your USB devices, have Console running and watch to see if the device is detected and whether an error is generated. However, in Console, you can see that it is detected and an error is generated: For example, I inserted a Windows (FAT16) formatted USB flash drive that doesn't mount and doesn't show on my desktop. To verify that your USB port is detecting devices, open "Console" (Applications > Utilities > Console).
When your Mac wakes up again, the drive may not have come out of its slumber. There can be a number of reasons why your Macbook Pro won't recognize a drive.įor instance, if you have a drive mounted and your system goes to sleep, it will also power down the USB port, putting your drive to sleep.
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