Network LAG after Attaching HDD

Hi,
Firstly apologies if I have missed someone elses post on this. If someone can point me to a similar or identical issue I would appreciate it! ;o)
OK - I received my new home hub 3.0 two days agao. All working with and an extended range on my network.
I have attached a 500GB external HDD to the USB port on hte router formatted as FAT32. I can see this drive and access it from my other PCs (which have mapped drives). Since installing however I am experiencing huge network lag. I thought I would give it a couple of days to "bed in" but its still going on! I have turned off all PCS and ensured nothing is replicating/copying (music etc) but the problem persists. Only when I turn off the drive does my network speed return to normal.
Does anyone have an idea on what could be causing this?
Responses greatly appreciated as i am scratching my head over it.

You are probably expecting too much of the home hub. The USB port is really only intended for USB memory cards.
Anything else is going to put a strain on its internal CPU, which is trying to do everything else. If you are using Windows PCs, they tend to keep polling network devices to see if there are any printers, its part of Windows UpnP.
The best solution is to use a proper NAS device with an Ethernet port.
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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