The original 75-Gb hd in my 2200 died after 4 yrs of hard work, and the second one is obviously ready to follow. I bought two Seagate 250-Gb replacements (very quiet unlike the original Maxtor junk!). The OS 3.4.772 refused to format the new disk beyond 137 Mb.

Seems like OS 3.4.805 is the way to go.
Installed 3.4.807 - worked like a clock!

See the wiki for mirror rebuilding instructions:
http://wiki.procooling.com/index.php...air_for_Orphan
Seagate drives however generate more heat. Will need to install a new fan with bigger CFM.