External (USB) Hard drive errors when plugging in Ipod mini

I just got an Ipod mini from a friend.
I installed the newest version of Itunes and also updated the Ipod mini software.
The problem I have had since the beginning is still there. When I plug in the Ipod, it gives me errors on my external hard drive saying "Write delay error", etc. It only happens when I plug in my Ipod. I also can't access the Ext. HD once the ipod is connected. Once I disconnect the Ipod and cycle the ext. HD then the Ext. HD starts working again. Everything is fine until I try to plug the Ipod mini into the USB again.
Also for reference the Ext. HD is on the back USB plugs and the Ipod I have in the front.
Please help!! My music is on my Ext. Hard drive and so I need it in order to transfer the music to my Ipod

hiya!
sometimes power drain through one USB 2.0 port can affect ipod connections on a different port.
do you have an electronics retailer with a good money-back guarantee nearby? if so, it might be worth experimenting with seeing if you get better recognition (while both are plugged in) by using a good quality powered USB hub.
love, b

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