Windows 7 64 bit USB external hard drives lose its connection and stops working.

This is a very serious error for users of WIN 7 64 bit only.
I have read hundreds of posts about this problem an not a word about it from MS.
We have tested this problem on four different computers and three different external hard drives using Win 7 Ultimate.
Even tried the RTM version.
If you connect "Any brand" external USB hard drive to "Any brand of computer" using Win 7 (64 bit only) and try to copy a large file like a movie from the internal drive to the external USB drive it loses the connection to the USB.
We even reverted back to Vista 64 bit on two computers for testing but Vista 64 works fine.
This occurs on all computers with different USB drives.
We have tried all the suggestions posted and none work.
It seems from all the posts that other USB devices are also having similar problems with the 64 bit.
Below is a more about this problem.
http://windows7tipsonline.com/USB_Problem.htm
If anyone knows how to resolve this please post a reply here.
Thanks

The link only refers to USB problems with nVidia chips, so it's not a universal problem. I have Win 7 x64 RTM installed and I just transfered 2 4GB DVD files and 1 18GB backup file from my internal SATA drive to my external USB drive
with no problems - no time-out!
<text>Since nVidia chipsets seem to be the culprit, nVidia and the motherboard manufacturers need to be told about the problem so that nVidia can correct the problem and not
Microsoft. If it's a nVidia chipset driver/software problem,
Microsoft is not going to fix anything since it's not a universal problem.</text>
I think this answer is a smoke screen, here's why. The issue of a USB HDD losing its connection AND not being recognized on a booting Win 7 x64 in any of its incarnations is a Microsoft issue, not nVidia. I have three PCs (actually 4 but one is in storage so
doesn't count) to see firsthand what happens with this issue. One, is a maxed out Toshiba with Windows Pro x64. Every now and then, it asks to format any number of my USB drives. I have Seagates, Iomegas, Western Digitals, and an OLD Maxtor. The Toshiba OS
will from time to time claim the Iomega and WD drives need formatting or have a wrong parameter etc. It doesn't do this with the Seagates or Maxtor. does the Tosh have nVidia chipsets? Yes. OK, now I attach these dives to my Dell Inspiron run by Windows Vista
Home Basic and intel Graphic Chip. The HDDs fire up right away. OK, I stick them into the ASUS G75VW-RS72, a DTR notebook on Windows 7 Ultimate x64. The machine has nVidia chipsets. Sometimes the HDDs fire up right away (Maxtor is never a problem), sometimes
they don't. What do I do? Unplug, replug-sometimes works sometimes not. Turn off the computer, turn it back on-sometimes works sometimes not. Unplug and put into another USB port-sometimes works sometimes not. Unplug and leave unplugged for anywhere
from 10 seconds to half an hour-sometimes works sometimes not. Switched to different external enlosure or the same or different brand-sometimes works sometimes not. Remove the HDD and put into a NetStar portable dock with its own power supply(http://www.vantecusa.com/en/product/view_detail/295).
Result? The computers NEVER, not EVER, even ONCE demonstrated an issue with the drive. Other times, I remove the HDD and employ a converter (http://www.sabrent.com/category/hard-drive-enclosures/USB-DSC5/). Result? The computers NEVER, not EVER, even ONCE
demonstrated an issue with the drive. So I think the evidence suggests Windows is finicky and Microsoft is passing the buck on this.

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