Captivate Micro SD memory card: Not readable?

May 4, 2011
I current have 2GB micro SD memory card.
I have been using this card on 2.1/2.2 STOCK ROM and older version of MIUI,
But on 1.7.8 beta MIUI, I get the following (picture) message and can't see the SD card folder on File Manager- HELP~!

-SD card inserted:

-SD card not inserted: