Found this on nForce forum
http://www.nforcershq.com/forum/viewtopic.php?t=46051&start=0
Application Note
nForce2 MCP-T/MCP
USB 1.1 Device Compatibility
DA-00822-001_v01 2
04/08/03 NVIDIA CONFIDENTIAL
USB Device Compatibility
This application note addresses the compatibility of the NVIDIA®
nForce™ MCP and the nForce2 MCP-T and MCP processors with several USB
devices in the marketplace. The devices listed below exhibit similar
USB non-compliance.
• Aztech UM9100-U USB modem
• Creative Nomad Muvo MP3 player
• Creative Nomad Jukebox Zen MP3 player
• SCM video capture device (DCS200)
• Sonic Blue Rio S30/35/50 MP3 players
• St. Johns Technology USB2 HDD
• NuSLIM SUB 2.0 Portable HDD
Detailed Description
Customers have reported that several USB devices do not function
reliably with the NVIDIA MCP processors. NVIDIA has tested them and
determined they have very large clock jitter and fail the USB1.1 eye
diagram requirements. Placing any of these devices behind a USB1.1 hub
does not resolve this issue since the hub will not reclock, but will
pass the jitter to the MCP. Depending upon the chip used in the USB
device, a workaround or fix may be available.
Proposed Solutions
Several solutions exist depending upon the specific device.
General Solution
These devices work with MCP/MCP-T if they are behind a USB2.0 hub.
Since the USB2.0 hub reclocks, the jitter is not passed through to the
MCP/MCP-T. This is a general solution for all devices mentioned in
this document.
Sigmatel-Based Devices
Devices that use the Sigmatel STMP3410 part work effectively if a
firmware update is applied. (Please see the respective websites for
updated firmware.)
These devices include:
• Creative Nomad MuVo MP3 player
• Creative Nomad Zen MP3 player
• Sonic Blue Rio S30/35/50 MP3 player
Note: These devices need to be updated in a non-nForce2 based system
or there may be device failures while flashing.
Genesys-Based Devices
Devices that use Genesys GL811 chips may exhibit a failure if a large
file is copied. When a file (usually larger than 20 MB) is copied to
the USB drive, an error is prompted during the copy transfer. This
causes the drive to disappear from the system device manager. Versions
20 and beyond are compatible and will not exhibit this failure.
These devices include:
• St. John's Technology USB2 HDD
• NuSLIM SUB 2.0 Portable HDD
Copyright
© 2003 by NVIDIA Corporation. All rights reserved
Three sites that have the info:
http://www.shuttle.com/share/fae/hq/faq/sff/qa/nForce2_MCP-T_MCP_USB1.1_AppNote.pdf
http://www.epox.de/_boarddetail/8rda+/nForce2_MCP-T_MCP_USB1.1_AppNote.pdf
http://www.elito-epox.com/_boarddetail/8rda+/nForce2_MCP-T_MCP_USB1.1_AppNote.pdf
Final solution appears to be purchase and install a "PCI USB cards
cheaper and garunteed rather than being a try this solution" per
posting by 'wonkanoby' at above forum
I'm still fighting a SanDisk Imagemate SDDR-89 USB 2.0 12-in-1 card
reader. It won't work with my Windows 2000 SP4/5 A7N8X-E Deluxe 2.0
with BIOS V.1008. Won't work means the four green lights don't turn on
and the four extra drives letters don't appear in "Control Panel".
However, it works fine with W98SE and USB 2.0 PCI card with factory
driver from 1.0 version CD. I can get several other USB 2.0 devices to
work off any of the six USB ports - two of which I have extended to
the front of the chassis.
Found another refrence at
http://www.techspot.com/vb/printthread.php?t=7934&page=2&pp=20
to NEC USB 2.0 driver at
http://www.techspot.com/redir?target=ftp://ftp.abit.com.tw/pub/download/drivers/usb2/U2v2_1_2_1.exe
They show up in Device Manager _BUT_ still same problems.
Guess I'll go by a real PCI USB 2.0 card and say forget it :-(
John O