It tells the hardware which title is present and where the game data starts.
However, ps3discsfb isn’t a standard PlayStation 3 system file or official Sony term. It’s likely related to: ps3discsfb file download verified
He clicked the download link. A small dialog box popped up. The file was tiny—barely a few kilobytes. But in the world of console emulation, size is inversely proportional to importance. The smallest files often hold the keys to the kingdom. It tells the hardware which title is present
A Guide to Understanding PS3 Discs FB Files: What You Need to Know a personal backup label
Even if the file exists and is not malicious, the term “ps3discsfb” is obscure enough to suggest it is either a mistyped upload, a personal backup label, or a honeypot for inexperienced users.