I had been using my C1000 with PdaXrom Beta3 for about two month, and about one week ago I find this problem.
After each suspend, the SD card will be umounted. But it is not a clean umount, the system still thinks the SD card is mounted so I can not just mount it on. And when trying to umount, it gives me messages saying device busy. The only way to get around this is to use the MB applet to eject and reinsert the card, or sometimes I have to exit X, eject the card and insert it again to make sure it is mounted.
This is getting more and more annoy. Not only the files and programs stored on card become inaccesible before trying to remount the card. If I turn on the swap file on the card and suspend, the next poweron will hang the system and force me to restart.
The SD card is divided into 2 partition: a ext2 dev/mmcda2 on /mnt/card and fat-16 dev/mmcda1 on /mnt/card-fat16. And is a lexar 1G sd card.
If more information is needed, please let me know. Any advise is apperciated.