Boot block always unrecognized

One day I've notice (check by NDD)that my 7300/180 boot blocks is unrecognized, I choose to fix it, but after the next day or running some Application, the boot blocks is unrecognized again, in this case, went I format my MO Disk, the Disk have eject difficulty, also the computer can't read some of the file in the MO Disk, so I've try to reformat my hard disk, reinstall all the application, after finish the installation, I've reboot my computer but the computer restart automatically once the MO is Auto mount/mount by FWB Mounter, then I check my computer with NDD, again the boot blocks is unrecognized, I tell this problem to my friend and they say the MO Driver is corrupt,ask to update the MO Disk Driver with Hard Disk Toolkit, doing so, the MO Disk can eject well, but the boot blocks again unrecognized. (Before Update the Driver, I reformat the Hard disk again, because i don't know where the problem is.) How can I solve this problem?
Please let me know, any extra helpful information you need to know. I need your personal answer, thanks for your help.