Mac os refresh usb devices

I don't see the external drive in Disk Utility. The System Report also does not show the drive.

force OS X to rescan for USB devices?

Is there a command I can issue via terminal or otherwise which will force the Mac to rescan the USB bus for attached devices - without rebooting? Premium Member join Toronto, ON. Perhaps you could reboot the machine, then log back into it. Depends on how the remote access software is set up. The remote access software I use GoToMyPC will allow me to reboot the Mac but I prefer to not do this if at all possible as the Mac mini is tucked away, and getting a blind man to find it and cycle power - if there's the need to do that - and to 'recognize' what he's looking via solely a verbal description can be a challenge.

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Thanks very much for your suggestions for the newbie. More Less.

Troubleshooting a USB device on a Mac

All replies Drop Down menu. Loading page content. You will need to hold these keys down simultaneously in step 4. Turn on the computer. Press and hold the Command-Option-P-R keys before the gray screen appears. Once the Mac is running and all start-up applications are done loading go ahead and connect any devices into the unresponsive USB ports and see if this fixed your problem.

When ports and other Mac components tend to be glitchy or unresponsive we need to reset the chips that are basically in charge of these actions.

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Now restart you Mac and hold these keys down as the Mac starts-up. When this is done your Mac will restart again on its own and once you hear the start-up chime a second time go ahead and let go of the keys.

Why are the USB ports not working on my Mac?

Once the Mac is loaded and running check the USB ports and see if they are working properly. Start by ensuring that no applications are running and if they are go ahead shut them down.

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Now put your Mac to sleep then wake it back up. Next restart your Mac and once it has completely restarted and running again you need to turn right around and shut it down. Reinsert the battery and turn your Mac back on. Once everything is running and loaded up go ahead and test your USB ports again.