To aid in following the flow, and to better understand Open Firmware designations, here is a short list of some of the more important devices:
| scX | SCSI Controller | Typically, sc0 and sc1 |
| sdX(y) | SCSI Device (partition) | X = integer, y = alphabetic partition number, ie, sd0 |
| hcX | hardware (IDE) controller | usually hc0 |
| hdX(y) | IDE Device (partition) | X = integer, y = alphabetic partition number, ie, hd0 |
| enX | ethernet interface | usually en0 or en1 |
There are many other Mach/BSD device types. These few represent the ones you are most likely to need to know.