Can no longer access USB external hard drive

Hi - I am running OS X 10.8.4 on my iMac (21.5-inch, Late 2009), and have been using a La Cie USB  external hard drive for several years for my Time Machine backups without issues.  All of a sudden yesterday, the external hard drive disappeared from Finder and my Desktop,  and as a result, no more Time Machine backups  I rebooted both the external hard drive and iMac several times  and changed the USB cable but with no success.  Disk Utility and Time Machine cannot see the external hard drive but it does appear under System Information => USB (see below).  I connected it to my Windows 8 laptop. The Windows laptop can see the external hard drive under Disk Management as an uninitialized disk.  But I will not allow me to initialize it and therefore cannot acces it.
  Product ID:          0x0951
  Vendor ID:          0x059f  (LaCie)
  Version:           0.00
  Serial Number:          152D203380B6
  Speed:          Up to 480 Mb/sec
  Manufacturer:          LaCie
  Location ID:          0x24300000 / 4
  Current Available (mA):          500
  Current Required (mA):          2
Any help to restore the external hard drive would be appreciated.
Ron

Thank you for your quick response.  Disk Utility does not see the hard drive.  Windows 8 does see it under Device Manager and says that it is working propoerly but it will not allow me to initialize it.   As indicated  to Lin Davis,  I'll buy a new external hard drive.

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