Operating system and rope: what they have in common

1. Step 1. Operating system — has part — File system. A file system.
2. Step 2. File system — uses — Hard disk drive. Partitioning the disk.
3. Step 3. Hard disk drive — has part — Ball bearing. Bearings (later fluid-dynamic ones).
4. Step 4. Ball bearing — uses — Friction. A bearing replaces sliding friction with far lower rolling friction.
5. Step 5. Friction — is used in — Rope. Twisted fibres hold each other by friction.

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