[CentOS] Why new "SCSI" devices in 4.5 kernel?

[John R Pierce]

Steve Snyder wrote:
> It occurs to me that maybe CentOS 4.5 wants to handle my CD-ROM as a SCSI 
> device.  Is that done with plain old CD readers?  This Sanyo CRD-S372B is 
> far to old to actually write CDs and would probably burst into flames if 
> I put a DVD disk into it.
>   


I can't answer the 4.5 specific aspect, but in fact all ATAPI devices 
(CDs,, etc) attached to ATA/IDE use the SCSI command set, unlike IDE/ATA 
hard disks, which use the old WDC1003 'commands'.