So I ordered some memory sticks for my D50 and they sent me the wrong ones. I just ordered the stock Memory Stick Pro Duo.
They ended up sending me PRO-HG Duo HX Memory Stick.
According to
http://pro.sony.com/bbsc/ssr/product-PCMD50/ the D50 supports HG but doesn't mention HX.
Anyhow when I put these in the D50 it says "Unidentified Media". However if I format the card I can record on it.
I'm trying to get the company to send me the cards I ordered but am wondering if these can be made to work. Perhaps a firmware upgrade? Anyone have any idea?