The Z-80 was really an improved 8080, but still 8 bits. The 8086 was 16 bit, and the 8088 was the same 16 bit but an 8 bit bus. (I believe Ford was the biggest buyer of the 8086, as IBM adopted the 8088). The Z-80 dominated the 8080 in the early microcomputer world, but Zilog’s Z-8000 never got adopted in any significant way. It was probably a much better processor than the 8086, but was too different and IBM went for the more compatible processor as it wanted to get the PC up and going quickly.
Storage of data was on cassettes that would operate with a normal cassette recorder.
Also known as sloppy drives.