When attempting to upgrade my iMac from Snow Leopard to Mavericks, I receive the message "This disk is used for Time Machine Backups" when I try to select the lone available hard drive.

When attempting to upgrade my iMac from Snow Leopard to Mavericks, I receive the message "This disk is used for Time Machine Backups" when I try to select the lone available hard drive.  I have ensured that Time Machine is turned off.  Upon some Google research, some who reported this problem were told to delete the folder backup.backupdb, but I do not have this folder on my Mac.  Any suggestions?

The folder would be at the root of your hard drive. Double-click Macintosh HD and look there.
If it isn’t there, I’m not sure what it is seeing.

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