Yes. Inside a windows command prompt, change your directory to the location of your Android SDK ADB program (generally located in the "tools" folder of the Android SDK.) Connect your phone to the computer via USB.
Next, type these commands:
adb shell
echo /dev/block/mmcblk0 > /sys/devices/platform/usb_mass_storage/lun0/file
In recovery mode, this will enable the USB, and will allow you to access your SD card.
You may also want to read this thread, there are more qualified people on XDA that can answer your questions than in this forum:
http://forum.xda-developers.com/showthread.php?t=498026
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