jpl, Thank you very much for your detail advice. After reading that, I am much inclined to suspecting a bad disk, because I have erased the HD a numerous times and reinstalled both Mac
OS 9.2.2 and Mac OSX, and could not get them work flawlessly. BTW, this is a 10GB, used HD, which I bought from eBay a few years ago. But, I have hardly used the G3 WS, because I had lots of work that...