Hi Jeff.
Well, for starters your drive is a 7200.12, not 7200.11. Thus, trying to run the 7200.11 internet fix to a .12 is always a bad idea. To put it simple, maybe you got lucky that your drive has protested and didn't let you go through to step 4 (or whatever it is) where you put the m0... command, because you would end up with more trouble.
Secondly, the error you got means "R/W Subsystem not Ready to Accept Commands" (ie. the drive is BUSY). Did you isolate contacts when you issued the Z command? If not, then the error message is expected.
Anyways, as I said, even if you're IT this is out of your league (no offense) and I suggest you consult a good DR lab (I suggest
http://www.datasaversllc.com/ -- ask for Jon) who can help you recover your data. Remember, you don't want your wife to get REALLY mad
However, if you insist on DIY, I 'd like to see a terminal output from drive's startup. Connect your terminal cables and power on the drive. Then see what the terminal responds and post it here.
Good luck!