I just upgraded my operating system on my MacBook Air and now my laptop won't detect my Toshiba 1T external hard drive

I just upgraded my operating system on my MacBook Air and now my laptop won't detect my Toshiba 1T external hard drive, how to solve this problem?

Try some of the troubleshooting steps outlined below:
Troubleshooting an external hard drive
> Unplug the hard drive, wait a few seconds, and then plug it back in
> Restart the computer
> Unplug any other peripherals from the computer
> Plug it into a different USB port
If none of those steps work, see if it is recognized in Disk Utility.
Checking a disk with Disk Utility
To check a disk using Disk Utility, launch the Disk Utility application in any of the following ways:
> Type the first few letters of its name into Spotlight. Select it from the results.
> Go Launchpad > Utilities > Disk Utility
> Go Applications > Utilities > Disk Utility
Once Disk Utility is opened, check to see if your external HD appears on the sidebar. If it doesn't appear at first, try the troubleshooting steps above again while leaving Disk Utility open, each time checking to see if the external HD appears.
Austin

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