Finding correct information to update mtab and fstab?

Is there an automated way to update my mtab and fstab? Or a command I can run so that I can copy the output into these files? I'm just nervous about tampering with these files because I know they are critical. I previously had a md0 and md1 array but they "disappeared." Now my mtab and fstab is stale and it is giving me problems trying to run this automatic RAID utility, raider . ### fstab # /etc/fstab: static file system information. # # proc /proc proc defaults 0 0 /dev/md0 / ext3 errors=remount-ro 0 1 /dev/md1 none swap sw 0 0 /dev/scd0 /media/cdrom0 udf,iso9660 user,noauto 0 0 ### mtab /dev/md0 / ext3 rw,errors=remount-ro 0 0 tmpfs /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0 proc /proc proc rw,noexec,nosuid,nodev 0 0 sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0 udev /dev tmpfs rw,mode=0755 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0 devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=620 0 0 ### /proc/mounts rootfs / rootfs rw 0 0 none /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 none /proc proc rw,nosuid,nodev,noexec,relatime 0 0 none /dev devtmpfs rw,relatime,size=1547340k,nr_inodes=215947,mode=755 0 0 none /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 /dev/sda1 / ext3 rw,relatime,errors=remount-ro,data=ordered 0 0 tmpfs /lib/init/rw tmpfs rw,nosuid,relatime,mode=755 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0 ## Here's what I think based on observation ### My proposed update to fstab (should it be sda or sda1?) # /etc/fstab: static file system information. # # proc /proc proc defaults 0 0 /dev/sda1 / ext3 errors=remount-ro 0 1 /dev/scd0 /media/cdrom0 udf,iso9660 user,noauto 0 0 ### My proposed update to mtab (should it be sda or sda1?) /dev/sda1 / ext3 rw,errors=remount-ro 0 0 tmpfs /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0 proc /proc proc rw,noexec,nosuid,nodev 0 0 sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0 udev /dev tmpfs rw,mode=0755 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0 devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=620 0 0