External harddrive error - not ejected properly

I bought a new 1.5TB Seagate Free Agent (ST315005FDM201-RK) drive and connected it to my iMac running Snow Leopard. I'm using it as a Time Machine drive
Every few minutes I get the "Drive not ejected properly" error dialog. The drive is still accessable - I think it reconnects itself.
But literally, every couple of minutes I get the error. Any ideas?

i too bought this HDD. Actually i bought two. One for my lady and one for me. i had purchased a seagate 2.5" portable and it did this too. i just bought a better cable for it and that fixed the problem. but on this 1tb im having the same problem only this time, a better cable isnt doing the trick... funny, both are connected to my 17" Macbook Pro OS X 10.6.2, but hers doesnt drop like mine does. So i too would like a solution, but ill give a few bits of info to see if anyone one else can help us. Hers is MS DOS formatted so she can share with her work computer... could that be a reason her doesnt randomly disconnect? Also, when its in constant use(rendering, or transferring large data) it never drops out. and last, mine has 2 partitions, both formatted the same, but there are two partitions... could that maybe be a cause? thanks for any help!

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    Jim586 wrote:
    Hi.
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    It's connected using the supplied USB 2 cable.
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