Motorola flipout cannot access SD card while USB connected

I have a Motorola flipout with Android 2.1. and the USB my driver is the following: http://developer.motorola.com/docstools/USB_开发者_开发知识库Drivers/Handset_USB_Driver_64/

Whenever I connect the USB cord to the cellphone I can access the SD card from the computer and I no longer can access it from the cellphone. That means that any software on the phone that needs to access the SD card can't do so, therefore I can't debug anything that needs file access. Is there any way to connect the USB cord yet at the same time not mount the SD card file system onto the computer filesystem?

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The SD card can only be mounted by one device at a time. It sounds like the default setting upon USB connection is to basically mount the SD card to your computer so it can browse/edit the files. Use blindstuff's method to disable USB storage mode. your phone will still be connected via USB allowing you to use adb to debug applications.

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Blindstuff called it. The reason you cannot is because the SD card is in use by the computer (depending on how you've connected of course). While the SD card is in use by the computer, it's not available to the device.

I strongly suspect that's an artifact of SD cards, not Android (or iPhone, or anything else).