Difference between IDE and SCSI ??

Mikkel L. Ellertson mikkel at infinity-ltd.com
Tue Feb 5 23:44:53 UTC 2008

Rick Stevens wrote:
> The kernel treats all block-replaceable storage (hard drives, ZIP
> drives, FLASH drives--basically everything except floppies and CD/DVD
> drives) as though they're SCSI (regardless of their physical
> connections).
CD/DVD drive are also treated as SCSI drives. You get /dev/scd0 and 
/dev/sr0 for the first drive, /dev/scd1 and /dev/sr1 for the second, 
etc. This is regardless of them being PATA, SATA, or a SCSI drive. 
SCSI CD/DVD drives have always used /dev/scdx.

> Old kernels separated PATA/IDE drives from SCSI with the "hd" in
> /dev/hd* names meaning "hard disk" (PATA/IDE) and "sd" meaning "scsi
> disk".  With new kernels, you won't see "/dev/hd*" names any longer, so
> it may be easier for you to think of the "sd" in /dev/sdXY device names
> as "storage device" from here on in.
Tape drives are /dev/stx and /dev/nstx - each drive has both 
devices. (SCSI tape and Non-rewinding SCSI Tape)

One thing I have not looked at - are the special CD interfaces still 
handled the same, or are they SCSI devices now? (The ones that 
attach to sound cards, or their own special controller.) I suspect 
they still have their old names, because they were not IDE or SCSI 


   Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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