freebsd - boot error

[Fluffles]

freebsd wrote:
> I am working in freebsd 6.0 unix system. Currently I am installing apache and
> php. Now I am not able to boot it normally. When I boot unix it
> automatically enters into the single user mode 
> The error is
> 'ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABKLE>
> LBA=7509039'
> CANNOT READ BLK:
> UNEXPECTED SOFT UPDATE INCONSISTENCY
>  
> Note: I got this second time. First I reinstalled freebsd to rectify, but I
> dont want to do this again because I went through long into it
>  
> I searched some sites which asked me to use fsck but in vein
> Please help me
>
> regards 
> Arun
>   

You hard drive contains bad sectors - sector 7509039. Solution: replace
the disk, and recover as soon as possible any valuable information on
the disk.

- Veronica