Plugging WD MyPassport 0748 on either USB hangs the router

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Plug WD MyPassport 0748 into USB port
2. Access admin interface
3. CPU Load jumps to 75-100% and interface becomes unresponsive
4. Unplug drive and router CPU drops to 0-20%
5. I chkdsk the drive on my PC and then replug into the router; same problem
6. I tried plugging into the other USB port - same problem
7. I down-revved to the standard ASUS firmware and the problem goes away

What is the expected output? What do you see instead?
See above

What version of the product are you using? On what operating system?
RT-N56U with RT-N56U_3.4.3.7-069 custom firmware

Please describe the problem as detailed as it's possible.
See above

If you have connection problem, then syslog file is required. (please do
attach it as a file)
- If you need this, will need instructions on how to receive it

Note that if there will be a poor problem description the issue status will
be changed to 'Invalid'!

Original issue reported on code.google.com by jdpu...@gmail.com on 18 Nov 2013 at 9:46

[GoogleCodeExporter]

Do you use miniDLNA?

Original comment by Dr.Sydorenko.O on 19 Nov 2013 at 1:53

[GoogleCodeExporter]

No, I have not loaded and do not use any extra features like dlna or aria. At 
one point I had the "Auto check filesystem on USB storage plug? " option set to 
Yes, but I turned that to No, rebooted the router and still have the same 
hanging problem when I plug the USB drive.

Original comment by jdpu...@gmail.com on 19 Nov 2013 at 2:25