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> And SATA/SAS drives are running multiple ARM Cortex M series MCUs

To be totally pedantic WD HDD controllers are Cortex R cores, shifting to RISC-V.

Compare it to the straightforward days of yore, when my hard drive controller only had a Z80 and my printer an MC68000.

Or my floppy drive had the same CPU and roughly the same clock as the computer...

C64? Or was there some other system that was true for?