LabVIEW SignalExpress stops recording after 20 hours

Hi,
I'm recording 8 channel voltage using SignalExpress 2010 with USB 6221 board. I have an 8-channel recording step, a 4-channel ToAscii step and another 4-channel ToAscii step. The ToAscii goes to a USB external hard drive. I've been trying to record for 72 hours straight. I've tried 3 computers with the following results:
Windows XP - 4GB- Core 2 Duo: Computer is unresponsive after 48 hours. Have to force restart
Windows XP - 4GB- Core 2 Duo. Records for 20 hours then SignalExpress stops writing to disk. The traces on SignalExpress stop changing. But the External hard drive is still spinning.
Windows 7 - SI 2009: Same as the 2nd situation except after one hour.
I need it to be stable for 72 hours.

Hello
There,
It
seems like you are encountering a bandwidth limitation and maybe over-utilizing
the USB bus network. A good way to relieve some of the bandwidth usage is
to reduce the amount of communication/transfers on the USB network. With
that said, can you use an internal hard drive instead of a USB external drive?
Try to specify the ASCII/LVM file in a local disk instead of an external
disk. Regarding acquisition, what are the sampling rates for the analog
input channels? Sampling at a considerably fast rate will cause your
system to crash if the USB bus cannot handle offloading the information in time.
You can reduce bandwidth by reducing the sampling rate of your
acquisition. Note that the maximum transfer rate for USB 2.0 is about 480
MB/s and can fluctuate depending on various factors. I would reference
the following link below to further troubleshoot:
USB DAQ
Bandwidth Considerations and Troubleshooting
http://zone.ni.com/devzone/cda/tut/p/id/9732
USB
Specification
http://www.usb.org/developers/docs/
I hope this helps.
Regards,
Roman Sandoval | National Instruments | RF Systems Engineer

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