Difference between SSD and SSD card

  An SSD is a solid-state drive, or essentially a standard computer hard drive that uses semiconductors (instead of a spinning wheel and a reader's arm) to read or access the data. By "SSD card", you mean an external SD memory card or a chip. You can create a hidden copy of your HDD in an SDD. But as Whitson Gordon mentions in his Lifehack article of April 2013, that may not be your best option to transfer or clone your hard drive. Apparently, an SSD has less space to work than an HDD; If you are looking to migrate your drives without having to reinstall Windows, this is something you should consider.

Relays 
   An easier approach would be to use relays. Faster for a beginner to visualize the contacts and how they change. The coil is direct. Mechanical contacts will handle an inductive load more easily (I know there are chunky semiconductors) without having to worry about exceeding the absolute maximum ratings of a device due to transients (we do not know how big these engines are), and so on. The implementation is also less involved: relays with appropriate connection to screw terminals and what is to be done. The requirements here are simple: turn pump C on if pump A or B is on. It should be to maintain the basic solution as well. It is not mentioned if both A and B are turned on, but that situation should not be a problem either.

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