you mean, when you hook up the usb, it does not show as a drive with the (remaining) capacity in the drive?
if this is what you're saying, it is how it is.
I used to pop the card, put it in a reader to connect to my pc, then put it back in and boot.
alternately, you could use an app to transfer files over http or ftp
I quickly got tired of not having the device run in full speed and put Froyo on eMMC