For the first time I tried upgrading a series 1 with a drive larger than 137g. Installing a new Western Digital 250g drive I followed Hindsdales instructions. I reinstalled the 250g drive into the TiVo and booted up just fine. The system info reports 311 hours capacity! I never ran "copykern" as I understood would be needed for a drive this big on a series 1. Can anyone explain what this LBA48 stuff was all about.