- Filesystem: Your view, using the OS. Pages in a file are logically consecutive.
- Disk pages: Lower level view, pages on disk. Pages that are logically consecutive
may or may not be adjacent.
- On random access, read 4 consecutive pages.
- Scan red file: 2 random accesses.
- Scan blue file: 2 random accesses.
- Scan green file: 3 random accesses (even though
it's a smaller file).