You may verify whether what you are seeing is the hard disk (sda) or not for the purpose of pointing this the boot loader:
find /dev/disk/by-id/ -iname \*ata\*par\*1 | xargs file
if your disk is partitioned there are as many nodes therein for each partition:
find /dev/disk/by-id/ -iname \*ata\*par\* | xargs ls -l
Usually, while booted from /dev/sr0 the one on the /dev is the liveCD system, the one you are running (UNLESS if you have chrooted thereto). And the other one /mnt/dev is your root partition as mounted. To check that mounted root system's version on the /mnt/* --
that should echo to you whether it is a slackware or debian or whatever partition you have 'mounted' but that is certainly not the one you are running. Verify the running /dev the same way--
This time it is the running live CD version.
Hope that helps.