Bricked external Hard Drive, Can't Force Unmount or Erase

I have manage to brick a 1TB Western Digital USB 3 drive. I have all my data backed up, so I just need to reformat and repartition it. No big deal typically, however it appears I've done something terrible to this particular drive. Here are the things I've tried and how they've failed:
* Use Disk Utility to erase drive (multiple formats selected)
     * Disk Erase failed - Couldn't unmount disk
* Force unmount using terminal command "sudo diskutil unmountDisk force /dev/disk3
     *Failed - unable to unmount disk
* Restart in safe mode and attempt to force unmount disk using same terminal command
     *Failed - unable to unmount disk
* Restart in recovery, launch terminal, attempt to force unmount disk using same terminal command
     * Failed - unable to unmount disk
* While in recovery terminal, attempt to erase disk using "diskutil eraseVolume JHFS+ NewDisk /dev/disk3"
     * Failed - couldn't unmount disk
* While in recover terminal, attempted to erase individual partitions using "diskutil eraseVolume JHFS+ NewDisk disk3s2"
     * Failed -Different error this time!!! - Couldn't open disk
Apparently, the entirety of the internet is out of ideas at this point, or at least no one has ever had this level of trouble before now. Any help anyone is willing to offer is much appreciated. If I have to take the hard drive apart and move some dip switches - whatever. At this point I just want to solve this on principle, as the drive has no physical damage, just a jacked up partition that is, apparently, un-erasable. I'm losing my mind a little bit, because I can't think of good reason for why this could happen. Thanks in advance

Have you tried DiskWarrior? A few years ago it worked for me and they keep it updated.

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Perfect 1TB for $68
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Message was edited by: teoni

Invalid B-tree node size
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Disk Utility cannot repair that error.
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Bricked external Hard Drive, Can't Force Unmount or Erase

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