File system and heat pump: what they have in common

1. Step 1. File system — uses — Hard disk drive. Partitioning the disk.
2. Step 2. Hard disk drive — has part — Ball bearing. Bearings (later fluid-dynamic ones).
3. Step 3. Ball bearing — is part of — Bogie. Axle boxes with roller bearings.
4. Step 4. Bogie — is part of — Refrigerator car. Bogies.
5. Step 5. Refrigerator car — uses — Vapour-compression cycle. Later — refrigeration machines.
6. Step 6. Vapour-compression cycle — is used in — Heat pump. The same cycle as in a refrigerator.

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