[CentOS] Hot swap SATA?

[Alfred von Campe]

> /dev/hda is being controlled by a controller that mimics an IDE  
> drive and is being accessed through the kernel's ide layer.  /dev/ 
> sda is being controlled by a libata-supported controller and is  
> being accessed through the kernel's scsi stack with libata.

As far as I know, all drives (2 hard disks and 2 optical drives) are  
on the same controller.  Well, all 4 are plugged in to the  
motherboard of a Lenovo ThinkCentre M55 PC.  There is no separate  
controller, unless there is more than one on the motherboard itself.   
In the BIOS, these drives all appeared together numbered 1-5 (with  
one of these missing because there are only 4 devices total).

Alfred