I had the weirdest problem with my external USB hard drive – WD10000H1U-00 SN: WCAU42171237. Recently I started having wireless network problems with my Dynalink 1025W ADSL router. At some point the router just locks up and all the traffic just stops, you can browse internally but you can see packet loss. Of course I though that my router went funny because of torrent traffic and etc. but when I started testing it seemed that the torrent client didn???t affect the performance ??? means that it was bad all the time. So I though that the router is a goner and was planning to buy new. Then suddenly by chance discovered that when the computer to which is connected the hard drive is OFF the network works quite well. So I started troubleshooting the system and turning ON and OFF all the components. The first component that I removed was the wireless card ??? of coarse you would think that this may disrupt the wireless network, but no it was the same, then all web cams, mouse, keyboard and etc ??? still the same. At the end I unplugged my Western Digital My Book 1TB USB 2 HDD and the network started working.
I got shocked ???, I am IT Support Engineer and I had never seen such thing, the hard drive was causing wireless interference and was locking up the ADSL modem. To test it I got another 2 computers on the wireless network, started several torrents on each and waited to load the router, then plugged the HDD in the USB port and the traffic speed went down to 0 in 5 seconds. I did that test at least 10 times and it was absolutely the same. The HDD is 5 meters away from the ADSL router also in the past I changed 3 Wireless keyboard and mouse sets because I was quite unhappy with their poor performance. The hard drive ended up in the box and I just throw away the enclosure. I guess the board which was converting the SATA to USB was causing all that trouble.
I hope that helps to somebody else ??? never underestimate any device ??? it could cause the weirdest problem.