[j-nsp] M7i :hard-disk missing in Boot List

[juniper light]

Hi all,
Have any one seen this alarm :

M7i> show system alarms
1 alarms currently active
Alarm time               Class  Description
2006-05-10 12:47:17 WET  Major  Host 0 hard-disk missing in Boot List

seem to have some entries in /etc/vfstab not correctely mounted after the
router reboot,
i tried to correct the file system using : fsck -y but no results :
% cat /etc/fstab
#version 3
# Device       Mountpoint  FStype  Options  Dump  Pass#
/dev/ad0s1a    /           ufs     rw        1    1
/dev/ad0s1e    /config     ufs     rw        2    2
proc           /proc       procfs  rw        0    0
/dev/ad1s1f    /var        ufs     rw,noauto 2    0
/dev/ad1s1b    none        swap    sw        0    0
/dev/ad1s1b    /tmp        mfs     rw,noauto 0    0
/dev/ad1s1a    /altroot    ufs     rw,noauto 2    0
/dev/ad1s1e    /altconfig  ufs     rw,noauto 2    0

%fsck -y /dev/ad0s1e

** /dev/ad0s1e
** Last Mounted on /config
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
5 files, 9 used, 12309 free (13 frags, 1537 blocks, 0.1% fragmentation)

***** FILE SYSTEM STILL DIRTY *****

***** PLEASE RERUN FSCK *****

Appreciate your help.

Best ones