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Plugging in a 2nd External Harddrive Locks up my Computer

So, just like the title says, I have two external harddrives. One is a WD 500GB, and the other is a 250GB (not sure the brand). I've got an Dell Inspiron 600M, Windows XP SP2. Since I tend to be long winded, I'm going to try and bullet my situation:

-I have 2 external harddrives
-Either harddrive plugged into my USB by itself runs fine
-If the 500GB is plugged in and I try to plug in the 250GB, the computer freezes up, and responds very slowly (if at all to any mouse or keyboard inputs).
-The 250GB takes a very long time to load (only when it's being plugged in while the 500GB is plugged in as well
-If I turn off the 250GB after I have plugged it in, and the computer is frozen, the computer returns to normal.

What could be causing this kind of behavior? Is there something about my computer and handling two external harddrives at the same time? Any help is appreciated, thanks.

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Something I would try is...

In reply to: Plugging in a 2nd External Harddrive Locks up my Computer

Beg or borrow an USB 2.0 hub. Try various combinations with that.

Bob

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Huh, whaddya know

In reply to: Something I would try is...

Wow, I took out my USB Hub that I had brought with me, plugged the externals into it, and now they work perfectly. I'm fairly certain that the USB ports on my computer are both 2.0, so I'm curious why routing them through a Hub fixed the issue. Why should it matter where the externals are connected like that?

Even if no one is able to answer that, thanks for the info and solution (I was beginning to worry the external I just bought, the 250 one, was bad).

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(NT) Powered Hub??

In reply to: Huh, whaddya know

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USB JITTER CORRECTION.

In reply to: Huh, whaddya know

There are articles about this and it involves jitter correction on the USB data clocking. Not much to write about here, but you did ask.

Bob

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