Pathetic, I know, but I replaced the dying 600(odd)MB hard drive on my kids' 486 (AST Advantage! Adventure 4100) with a used 2.1 G drive. No jumpers-I took it off since it is a single drive. (jumper set to Master gave me "failed disk" message--haven't tried the CS setting) When I boot the system, I get a "non-system disk" error, so I boot from a Win98 startup floppy. I start Windows setup, which then runs Scandisk. When Scandisk starts, it tells me it can't read from the last cluster on the drive, and that my LBA setting may be wrong. I've enabled LBA mode, and entered the info in the BIOS setup re: cylinders, heads & spt. There were other settings that I wasn't sure of values for, so I left them alone. ("prewrite comp" and "multiple sector transfer") THE PROBLEM: I run Scandisk anyway, even with the LBA message, and when it gets to the surface scan, about a quarter of the way through, it's reporting every single sector it tries to read as bad. (I stopped after about 1000 out of 519,000) Can the drive be that screwed, or is this because of a wrong configuration in setup? Can someone tell me what to look for? The BIOS is Phoenix Version 4.04 Plug & Play, and the setup utility separates system setup and Fixed Disk setup.