Which Macs have USB-B connectors on them?Won't apologize for being pedantic but... Most USB devices do not have USB-A (thumb drives are an obvious exception). USB-A is the host side connector. Devices use USB-B (micro is the most common) and USB-C. I do not use USB-A much as I have USB-C to USB-B cables. The only cables I have with USB-A connectors are ones I have not thrown out yet. USB-A was a horrible connector and can not go away fast enough.