second internal scsi harddisk not detected everytime I boot new HP DV 9540 laptop

[user4]

I have a brand new laptop, HP DV 9540, but my second internal harddisk 
(/dev/sdb1) is not detected everytime I boot.

At first I thought it was a windows vista error, and have completely removed 
vista.

But the problem is still there from time to time.

Here is the content of the /var/log/fsck/checkfs file, and the result of of 
suggested command (e2fsck):
***

Contents of my /var/log/fsck/checkfs (when /dev/sdb1 IS NOT detected):

Log of fsck -C -R -A -a 
Sat Sep  8 08:55:09 2007

fsck 1.40-WIP (14-Nov-2006)
fsck.ext3: No such file or directory while trying to open /dev/sdb1
/dev/sdb1: 
The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

/dev/sda1: clean, 226563/4889248 files, 1397834/9765504 blocks
fsck died with exit status 8

Sat Sep  8 08:55:09 2007
*****************************************

Here I unmount the second internal harddisk:

root at hpubuntu:/home/user4# umount /media/sdb1
*****************************************

Here I run the e2fsck command:

root at hpubuntu:/home/user4# e2fsck -b 8193 /dev/sdb1
e2fsck 1.40-WIP (14-Nov-2006)
e2fsck: Bad magic number in super-block while trying to open /dev/sdb1

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

root at hpubuntu:/home/user4#
******************************************

Contents of my /var/log/fsck/checkfs (when /dev/sdb1 IS detected):
Log of fsck -C -R -A -a 
Sat Sep  8 09:05:26 2007

fsck 1.40-WIP (14-Nov-2006)
/dev/sda1: clean, 226563/4889248 files, 1397834/9765504 blocks
/dev/sdb1: clean, 169627/14663680 files, 1473913/29304560 blocks

Sat Sep  8 09:05:26 2007
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*****************************************
Any suggestions - thks ? :-)