If you meens - how to run emulator from Eclipse with attached storage card - then follow to this steps:
1. run Eclipse IDE
2. Find Run menu Item -> Run(or/and Debug) Configuration -> Android Application -> Target (tab) in Additional Emulator Command Line Options write -sdcard <fullpath to your sdcard file> (for example -sdcard "D:Android Enviromentsd_card.img")
3. Run/Debug you application with new launched emulator
Warning: This change will be available for selected project that change maded.
I hope it's help.
Best wishes, Bossly