I must have had two diff things happen at the same time then.
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the usbstorage module is a bit temperamental. if you point it at the sd, it is supposed to unmount the sd ad remount it so that only your pc can see it as a usb storager device until you unplug or eject hardware on your pc. then it gets remounted as a sd for you to use on the zaurus.
however, sometimes, it doesn't do it correctly and you can access the sd from both your pc and the zaurus concurrently. in this case, it it a bit flakey if you change any files, ie copy or remove files since the filesystem on the device is controlled by both your pc and the z, and thus might get out of sync.
sometimes of course, when your sd is being used, it fails to unmount and the pc won't see it as a usbstorage device...