I'm using Nikon D300. I've just switched image format from RAW to JPEG today. The sound of shutter seems different (faster than in RAW format) although they're as same shutter speed (I know that because I use Manual mode). In RAW format, I hear 2 separated sounds (I don't know what it's called), while in Jpeg, they're not clear and almost same as 1 sound only.
I wonder why they're different. Is RAW format needs to store more information, then it needs to open longer?