Lost Disks can be acquired by talking to people when they have a blue exclamation mark over their heads. While this does not always mean that they have one, there will always be a mark if they do have one. Not all Lost Memos are available at the beginning of the game; they will be unlocked as certain objectives are completed. There are thirty Lost Memos in the entire game. It is important to note that if a Spectrobe fossil is hinted in the Lost Memo, it can only be obtained once from that area.