As long as your /dev/sdb2 and it getting mounted you may not be able to run fsck (file system check disk)
AFAIK your main primary partition that your distro (should be) is mounted to is a EXT 4 journaling file system /dev/sdb1:-
Which looks like your Hitachi HDD:-
Did you edit or change any of your partitions?
Did you have a power outage or a not so graceful shutdown; is that why you want to run fsck?
Generally with that you need your distribution's CD/DVD for that to run.
Run this command as 'root' and please post the output of:
From what I read about "initramfs" the kernel will load this into a tmpfs space before it actually boots your system.
Is that pretty much what you have going on?