Actually, if it's 8gb it IS a SDHC "Secure Digital High Capacity" card.
The 2gb card may be either a standard or an SDHC card.
http://en.wikipedia.org/wiki/Secure_digital
My guess is that the standard card would more likely work with the 505--as before the firmware update that's all that was supported by the 505. When Sony updated the firmware to include ePub support they also added support for higher capacity cards. I've read several posts here from people who have trouble with higher capacity cards.
dordale
