# Data File IO (The Filing Cabinets) The **Data Files** are the main filing cabinets located in the [[Resources/Disk IO|Frozen Pantry]]. Every time the elephant needs a [[Structures/Page|Page]] that isn't currently in his [[Resources/Memory|Shared Buffer brain]], he must wait for the elevator to fetch it from these physical files. If you see these events, the elephant is physically limited by the speed of the disk. ### The Standard Operations ![[DataFileRead]] ![[DataFileWrite]] ![[DataFileSync]] ### The Heavy Lifting ![[DataFileExtend]] ![[DataFileFlush]] ![[DataFileImmediateSync]] ![[DataFilePrefetch]] ![[DataFileTruncate]]