From above, I found this mention of USB controllers sharing devices and crashing under high stress.
Windows XP will BSOD with a STOP 0x0000001E in Usbhub.sys when the USB bandwidth consumption exceeds 100 percent? 17-Sep-02
If you connect a
USB device to the same
USB host controller that you are using to stream
video or audio, the USB devices are re-enumerated on the bus, causing bandwidth consumption to exceed 100 percent. This high stress causes the driver to fail.
To workaround this behavior, use any one of the following methods:
- Connect the new
USB device to a different USB host controller than the one you are using for
streaming video or audio.
- Stop the stream , connect the device, and start the stream.
- Connect the new USB device before you start streaming USB video or audio.
Link:
http://www.jsifaq.com/SF/Tips/Tip.aspx?id=5733
Then also noticed that PHD FAQ says this...
Q) Last nite my entire system crashed with the dreaded Blue Screen appearing. I rebooted and every thing was fine, however i did turn off the enable server, just in case that was causing some kind of conflict.
A) BSODs BTW, can only really be caused by something operating at a low-level, like a system / kernel level driver. PHD itself operates in the user space and so can’t directly cause a BSOD. PHD can call a camera driver that can cause a BSOD, however.
Seems this may be the cause of the BSOD,... Im going to try using both cameras connected individually to the laptop.
Which then leaves me to 1 last Usb port connected to usb hub (GPUSB, DSUSB, usb-to-serial adaptor? )