Hard disk drive and solar panel: what they have in common

1. Step 1. Hard disk drive — evolved into — Solid-state drive. A replacement for the hard disk.
2. Step 2. Solid-state drive — has part — Microcontroller. A controller manages the memory.
3. Step 3. Microcontroller — is part of — CubeSat. On-board electronics.
4. Step 4. CubeSat — has part — Solar panel. Power comes from solar panels.

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