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This item is from the PC Hardware FAQ, by Willie Lim and Ralph Valentino with numerous contributions by others. (v1.25).

3.10 Can MFM/RLL/ESDI/IDE and SCSI coexist?

The PC is limited to two drive controllers total. SCSI, however, is a "host adapter" and not a drive controller. To the rest of your system, it appears more like an ethernet card than a drive controller. For this reason, SCSI will always be able to coexist with any type drive controller. The main drawback here is that on most systems, you must boot off a disk on the primary drive controller, if you have one. That means if you have SCSI and IDE in your system, for example, you can not directly boot from the SCSI drive. There are various ways to get around this limitation, including the use of a boot manager.

 

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