i chated with a Samsung support tech on Samsung website using my Focus today and asked him which sd card will my Focus support ? Below is answer from tech.
copied chat sesion: I understand that you want to know about the SD card which is compatible with Focus phone. Am I correct? gabe: Yes
Carlos: Thank you for confirmation.
Carlos: Let me inform you in this regard.
Carlos: The Samsung focus supports Sandisk class 2 16GB memory card.
gabe: Thank you very much:-D
Carlos: You're welcome. Is there anything else I can assist you with?
gabe: No thanks
Carlos: It was a pleasure assisting you. Thank you for contacting Samsung Technical Support. If you have a minute, please click on the blue "X close" button to receive a transcript of your chat and fill out a brief survey to help us serve you better. Have a wonderful day!
Chat session has been terminated by the Samsung. -end of copied chat sesion-
I will buy one soon and give it a try ! Hope this helps Samsung Focus users like me !