If your drives are Shugart standard from any computer before mid-90's (Amiga, Atari, Acorn…), then you use a flat ribbon cable, and tells which drive is unit # 0, 1 or 2 by moving their configuration ...

As the structures to be optimized, we take cable structures based on 3-conductor round and 2-conductor flat cables. The article compares three algorithms, highlighting their advantages, disadvantages, ...