Pretty much.Generally, and this is what I was told in a nightcourse I did, if its blown, the information from that area is gone. You might be able to darken the picture, but you wont get the detail back.
I'm sure someone more experienced will be along to correct me soon though.
does anyone know how to fix overblown images particularly the face area? i have a photo which is very light and over exposed? i think its due to the fact that my flash was too strong. i'd like to know how to fix it with photoshop