Very simple fix to the E-200.
Try plugging the Drive into a Windows 8.1 PC through USB.
You'll need a USB to SATA connector from an external HDD Kit available everywhere.
A message will show up saying the drive has errors on it.
Wait a moment then go to the drive itself.
There are 5 partitions, right click and click repair on all 5 partitions.
It should repair them.
This has worked on all drives I have worked on with the E-200.
Plug it back in to the Xbox and you're done.
Hope this helps, it's worked 100% of the time for us.
Kevin @ kcxboxrepair.com