usb hard disk access via samba / dlna fails after short time

[GoogleCodeExporter]

What steps will reproduce the problem?
1.samba file copy of a larger file fails after short time with disk I/O error, 
no files visible then anymore
2.same when playing a movie via dlna from the router's usb disk on an external 
rendering device, no files on device then anymore

What is the expected output? What do you see instead?
file copying or playing a movie should simply proceed ;-)

What version of the product are you using? On what operating system?
rt-n56u with 1.1.1.8e-b2 + Samsung Bluray BD-D5100 + laptop with kubuntu 
11.10/64

Please describe the problem as detailed as it's possible.
If you have connection problem, then syslog file is required. (please do attach 
it as a file)
Note that if there will be a poor problem description the issue status will be 
changed to 'Invalid'!
after initial connection of a usb hard disk (tried with 2 different ones, a 
500GB WD with ntfs, and a 1TB Samsung with ext3) everything looks fine. All 
files are visible via smb or dlna. But a few seconds after starting a larger 
file copy from that usb disk to my laptop via samba (wireless or wired), the 
copying stops with some disk I/O error, and the disk isn't accessible anymore. 
Same happens when playing a movie from that usb disk via dlna, just takes 
longer, but also the router isn't accessible on the bluray anymore afterwards. 
The general log and the dhcp leases log are completely emptied. It's not 
possible to remount the usb disk, only a reboot of the router brings it to life 
again. Normal router operations still seem to work. This effect definitely is 
new with the latest version, and it's 100% reproducible!

Original issue reported on code.google.com by wolfgang.griech@gmail.com on 19 Apr 2012 at 5:06

[GoogleCodeExporter]

I noticed that when using the closest usb port to the front panel my 4g usb 
modem gets disconnected from time to time. The same goes for my usb hdd (mybook 
4tb). When i use samba and view for example pictures from hdd, the 
application/windows explorer i use gets stuck for like 15-30 sec and then works 
again for about ten seconds and gets stuck again.

It's frustrating. When i plug in either of the devices to the farthest port 
(from front panel) everything works fine and have no problems whatsoever.

Original comment by pularim...@gmail.com on 1 Feb 2015 at 10:02

[GoogleCodeExporter]

The USB power supply obviously is too weak, you kinda confirmed it's even
worse on one port. Since I'm using a Y USB cable no more issues with the
USB hard disk.

BR Wolfgang

Original comment by wolfgang.griech@gmail.com on 1 Feb 2015 at 10:16