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Jan 6, 2015 10:13 AM in response to Garymickby Nubz N.,Hello Garymick,
One of the reasons for the hard drive not being seen is it is not getting enough power. Is it self powered? Does it mount directly connected to the computer?
Apple Computers and Displays: Powering peripherals through USB - Apple Support
Troubleshooting
If you have a peripheral (such as a hard drive, audio device, or camera) that is acting unexpectedly—such as not turning on or not being recognized by the computer—the peripheral may require more power than is available. If you have a USB peripheral or a chain of devices, such as a joystick plugged into a keyboard, which requires more than the available power try one of these options:
- Use a USB hub that comes with a power adapter.
- Check that the peripheral offers the ability to connect to more than one USB port at once.
- Find out if the peripheral comes with a power adapter.
- If you cannot confirm your device's use with a hub, connect the device directly to the Apple computer.
Best,
Nubz
