Advertisements Thanks very much for posting all of the detailed info. If only others would be as specific! I read and re-read all of the steps you took and I think I see one error (which bkdtv pointed out earlier...and I missed until just now ). It appears that you did not properly divorce your original eSATA drive from TiVo before installing the new eSATA drive. Although all you did was swap one drive for another, TiVo recognizes eSATA drives by model number. When you re-booted TiVo with the "new" eSATA drive attached it would have been looking for your original eSATA drive. Not finding it caused it to believe there was data corruption. It properly went into diagnostic mode; triggering an MFS assert (GSOD), which marks the file system as being damaged. The repair process detects and repairs inode/data problems, and then runs mfscheck to clean up database and directory problems. So the lesson here appears to be that if you're going to swap out an eSATA drive for another one, be sure to divorce the existing drive first. 1. Unplug TiVo. 2. Disconnect the AC cord and eSATA cable from the eSATA drive. 3. Plug TiVo back in and follow the onscreen divorce instructions. 4. After TiVo has fully rebooted w/o the eSATA drive unplug it again. 5. Plug the new eSATA drive in, turn it on and connect the eSATA cable. 6. Plug TiVo in and follow the screen instructions to marry the new drive. Divorces can be messy. Glad to hear your new marriage working out! BTW, if you happen to look at your new drive again, can you post the full model number? It should be one of these two: WD10EACS-00ZJB0 (OEM) WD10EACS-32ZJB0 (Retail) It'll help others in the future...your chance to give back to the community!