CentOS 4.6 x86_64, Dell PE2950 with DRAC5, onboard SAS RAID 1, 2 arrays. After booting installed system, /dev/sda exists but does not appear to be a hard disk. fdisk -l displays nothing for sda. CentOS is on /dev/sdb and the second RAID 1 array is now /dev/sdc. It's been suggested (in the Dell Linux mailing list) that it is related to the virtual CD device of the DRAC. But why would it change after install? Is it perhaps a difference in drivers that are available in the installer vs. the live kernel? How can I find out what /dev/sda is? Any way to force the drive order from the CentOS side? No relevant options that I have found in BIOS or RAID setup. bash-3.00# ls -l /dev/sd* brw-rw---- 1 root disk 8, 0 Apr 29 05:15 /dev/sda brw-rw---- 1 root disk 8, 16 Apr 29 05:15 /dev/sdb brw-rw---- 1 root disk 8, 17 Apr 29 05:15 /dev/sdb1 brw-rw---- 1 root disk 8, 18 Apr 29 05:15 /dev/sdb2 brw-rw---- 1 root disk 8, 19 Apr 29 05:15 /dev/sdb3 brw-rw---- 1 root disk 8, 32 Apr 29 05:15 /dev/sdc /dev/cdrom points at /dev/hda mount /dev/sda /mnt yeilds 'No medium found' When virtual CD media is connected via DRAC, it is found at /dev/cdrom1 which links to /dev/scd0 -- Jeff