CD-R/RW: ATAPI? SCSI? IDE?

[Harold Crouch <hcrouch@mchsi.com>]

The CD-ROM that I used to have in my computer was clearly an IDE/ATAPI
device.  When I replaced it with a CD-R/RW, the Libranet installation
utility changed things here and there.  The grub configuration line
was changed to include "hdc=scsi."  /etc/modules now includes the
lines "sr-mod," "ide-cd ignore=hdc" and "ide-scsi."  

What exactly is a CD-R/RW?  

Why must a CD-R/RW be treated differently than a CD-ROM?

Why was it necesary to change the Grub configuration line and add
additional lines to /etc/modules?  Doesn't Linux auto-detect all
hardware devices?

 

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