HT201250 I get an error message: "Could not unmount disc" when trying to set up a new external backup drive

Trying to back up my mac to update the OS. Just bought a new external drive, and when launching thru time machine I get the "could not unmount disc" error. The .dmg (macinstall) quit's unexpectedly too, so I can't launch it either way.

Hi, what format is it? If already Mac format, likely Spotlight is holding it open, if not you need to format it...
How to format your disks...
http://www.kenstone.net/fcp_homepage/partitioning_tiger.html
(To Install OSX on an IntelMac the Drive it needs the GUID Partitioning scheme mentioned at the bottom.)
Thanks to Pondini, Formatting, Partitioning, Verifying, and Repairing Disks...
http://Pondini.org/OSX/DU.html

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Hello, romac12.
Thank you for visiting Apple Support Communities.
I have experienced this issue before. If there have been any changes to your cellular account such as adding a line, plan change or upgrade, more than likely there is a provisioning issue on the carrier end. However, I would recommend going through the troubleshooting steps in the article below. If the issue persists, see step 9.
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http://support.apple.com/kb/ts3780
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HT201250 I get an error message: "Could not unmount disc" when trying to set up a new external backup drive

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