I have recently gotten purchased a WD40g hard drive. I was able to load up window 98se and it worked fine. Now for some reason when I boot up it comes up saying that the FAT has errors. It compares it to the back up or copy 2 of it and says they do not match and scandisk attempts to fix it. But is unable to fix it. I have used the ulitliy that came with the hard drive and reformatted it and paritioned it again. Loaded Win98 again and it worked. But the first time I rebooted same problem. I can not even get in to Windows any more. I have been reading a lot of stuff about Low Level format. Writing zeros to the drive. The disk that came with the drive has an option to write zeros to it. But will this work. How can I fix the FAT table so that it will work again. Write zeros to the drive?? Low level format??

You could post back the exact error message you are getting. Also when you run scandisk run a surface scan to make sure the hard drive is fine.

Scandisk will not even get that far. It just comes up saying that it could not fix it. Saying that Copy 1 does not match copy 2. Will try to fix. But it is unable to do it. I did not get a error code

I mean not the error code from scandisk but when you try to boot up windows Try scandisk /checkonly and maybe you will be able to do a surface scan.

I will try that and let you know. As you can see I have two computers. I just cut the other one back on and it went into window and I ran scandisk. I was checking the FAT and then the screen just went back. Now it comes up saying that Disk Write Error Unable to write to disk in drive c: Data or files may be lost. Press any key to continue. That keeps coming up when I press any key.

What does a low level format do excatly? and What does writing zeros to your drive do??

Try a windows 98 bootdisk and run scandisk /checkonly. have you tried to run scandisk in safe mode yet?