Hi all,

I have a Quadra 605 (aka LC 475) with NetBSD 1.5.1 installed. I keep 
encountering what seem like constant disk corruption problems. When the 
computer is running, there seemed to be no problems... I turned on the 
check_fsck option in rc.conf. Every morning (about 3am), the computer 
performs fsck on the hard drives.

It seems the hard drives gets corrupted pretty often--with no apparant 
reason. Most often, there are complaints of obsessive DUP blocks. Other 
than that, there are also often unreferenced inodes, that was cleared 
during fsck.

What is even stranger, when I do fsck in multiuser mode, it does not 
seem to fix the problem. Obviously, I cannot remount the disk as 
read-only(root partition). So I tried to clear all disk operations using 
sync. First run of fsck appeared to fix all the problems, but successive 
fsck runs show up the exact same problems. However, when I reboot the 
system into single user mode, then do another fsck--the same problem 
disappeared.

Although there appears to be no data loss (all the vital data are stored 
in another hard drive, which  almost always checked out ok), the fact 
that these errors appears on my logs is disturbing.

Any idea what is the cause of this?

Thanks for help...

Lucas.