Here is the story behind my attempt(s):
I exchanged PM's with "snowjay" after reading that he had successfully used WinMFS and a 2TB WD20EURS to make a drive for his S3 OLED. He remarked to me:
"I think the key to being able to recognize all of the 2TB is having 11.x software on the TiVo.
Then when you restore the truncated backup in WinMFS you answer "Yes" to the question if you want to use the extra space and then you also need to turn "supersize" on.
Other than that I'm not sure, I don't think I did anything special."
I did not have success, however. When trying to restore 648250b.tbk, WinMFS would return the error message "Error writing media inode 1"
. So this method, for me at least, failed.
I recently found this post from "Lussie":
He upgraded his S3 OLED from a 1TB drive with 11.x software to a 2TB Hitachi drive using WinMFS along with iBored. He copied the entire drive to the 2TB drive rather than create then restore a truncated back-up.
I had my original S3 OLED drive, put it back in my TiVo, did a "clear and delete everything" then upgraded the software from 9.x to 11.k.
I then used WinMFS to copy the drive from the original 250GB drive to my 2TB WD20EADS drive. It copied considerably quicker than Lussie's attempt, most likely since my Tivo drive had no shows to copy. I got as far as step 3:
Start WinMFS again (Right-Click "Run as Administrator")
You will get a warning about Tivo not handling partitions greater than 1 TB, but just ignore it (hopefully, you have Tivo Software version 11.0 on your tivo)
The warning wanted me to answer yes or no about the >1TB question. When I answered yes, WinMFS crashed (this program has encountered an error and must close). Ugh...
2TB does work for the S3 OLED. People have gotten around the 1.3/1.5TB limitation. I had one bought from "uoph" that worked fine for 6 months until it got stuck in a reboot loop. Too bad he is so difficult to contact; at this point it would be worth the $30 to have him replace/reimage.
Is it possible that the WD20EADS drive is defective despite diagnostics returning "no errors"?
Could something else is wrong in the Tivo itself, despite me replacing 11 capacitors on the power supply, and older, smaller S3 OLED drives working fine?
Could something left over from "uoph's" original image on the 2TB drive that is causing problems in WinMFS when I try to create a new image on the drive and create partitions?
Ah well, I can get by with my 1TB drive, but this really bugs me...