"please let us know what kind of image are you looking to install"
I'm not looking to INSTALL any image.
The problem is during the second stage of a Windows Backup - it fails about 70-80% of the time.
The second stage of a standard Windows backup (Win7 and/or Vista) is to save/update an image of the system disk, which can be used for a bare-metal restore of a failed system disk.
The system image is a VHD that is read, compared, and updated by the backup process.
The bandwidth load during the second (system image) stage is higher than during the first (file copy) stage, which is just to copy, zip and save files marked with the archive bit.
The backup works for the first (file copy) stage of the process, but fails for the second (system image) stage.
When it fails, the target USB3 disk disappears from the windows explorer, and the only way to bring it back on-line is to unplug it from the USB port and then plug it back in, so that P&P can re-connect it.
I can take the external drive and plug it into a USB3 port of a DH67GD based system, and it works no problem.
However, plugged into a USB3 port of a DQ77MK it fails about 70-80% of the time... which is obviously means that the backup is unreliable.
If the Model of your HDD is Seagate ST3000DM001 then it is a 3 TB hdd. There is a problem in Windows Backup when performing a "system image" backup. That is, you can't have the hdd to be the storage for your backup. You can go to the Microsoft's forum and search for "system image" to further read about this problem.
Yes it is an external hdd (seagate ST3000DM001 inside a Vantec enclosure). I have the same problem that you have and learn about the Windows problem about system image backup. Here is the link in case you want to verify. File backup is not a problem but system image backup only.
Using the rear-panel USB3 ports, and providing direct power to the drive enclosure.
Windows error logs simply complains that it can't find a file - presumably because the drive has gone off-line and it can't access either the target vhd or one of the various catalog files.
So, searching *in* Event Viewer > Windows Logs > System *for* "USB" does not show anything suspicious during the time when the backup fails?