Specifically, the ps3-disc.sfb file is the primary identifier for a PlayStation 3 game disc. When a game is installed onto the PS3 hard drive (or an external drive) for use with Custom Firmware (CFW) or backup managers like MultiMAN or webMAN, the system looks for a specific folder structure.

If you are running a jailbroken PS3:

The most frequent cause. You bought a used external hard drive from a friend, eBay, or a garage sale. The previous owner used it with their PS3. Even if they deleted their game saves, the ps3-disc.sfb file often remains because it is small (typically 2–10 KB) and hidden by default on the PS3’s file manager.

For users of the , the PS3-DISC.SFB file is the key to adding games to your library.

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If you rely on a full-system backup that spans multiple drives, deleting the .sfb file could break the backup’s index. In that case, the PS3 might refuse to restore from that drive, saying "No backup data found." But your actual data remains; you would just need to re-create the backup.

Jamal’s trembling finger hovered over the eject button. But the disc tray was already closed—and there was no button anymore. Just a smooth black panel where it used to be.