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AdmrlLocke Level 1 (0 points)

My iMac suddenly can't read the backup hard drive I've been using for Time Machine.  I tried unplugging the cord that connects the HD to the iMac and plugging it back in, but I still get "The disk you inserted was not readable by this computer" below which are buttons for Initialize, Ignore and Eject.  I was using a cord that went from larger square plug to larger square plug.  So then I tried one that went from smaller square plug to what I think is USB (thin rectangular plug) of the sort that connects the keyboard and mouse. It's the type that my printers and scanners use to connect to the iMac.  I did NOT just upgrade the OS or anything.  The external HD is an OWC Mercury Elite All Pro. It's worked fine since I got the iMac 4 years ago. What else can I try before just trying to initialize and

iMac, Mac OS X (10.6.8), HP Deskjet 2540, OWC Mercury Elite
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