Invalid Checksum when trying to use Seagate Backup Drive

Hi,
I'm trying to use a Seagate Backup Plus Drive with my Mac.  It was originally used with a Windows machine.  It does have the Seagate Dashboard Installer.dmg file.  When I try to install it, it gives me an "invalid checksum" error.
I've also opened it in Disk Utility and attempted to reformat it into the Mac OS Extended (journaled) format, but it says it could not unmount the disk.  I cannot see that it has any opened files that would be causing this problem.  Any suggestions?
Thanks!

If you think your Mac is having hardware problems, I'd run the diagnostics that came with your Mac.  If the diagnostics came on a separate disc, run them by holding down the "C" key while booting with that disc in the drive.  If you only have one "system restore" disc, hold down the "D" key while booting with that disc in the drive.

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