This is good .
Anyway, I got back to corner 0 as I have restored the original ROM chip and board to the drive and it is not showing the flash boot checksum error and boot prompt anymore, just as it was before.
Which could possibly be NOT "stuck heads" as you are now guessing.
The motor spins up and the drive makes like 12 kick noises and then the motor stops, but there is no output to the serial terminal and it does not respond to Ctrl-Z.
That was the original symptom.
I mean, if the heads are actually stuck, the arm should not move (nor the motor spinning at all).
No, your is the first report of such behaviour on a 7200.11 that I can remember, BUT is quite normal on 7200.11 ES2 and on other models, like the 7200.12 and possibly the "green" ones..
I notice that if I isolate the hda and or motor pins, even the good drives with Firmware CC1H and CC1J do not work, do not respond to Ctrl-Z or anything.
Do you know if this method of entering Diagnostic mode has been modified on recent firmware versions?
For these latter ones two pins must be shorted to access terminal, but you should anyway get something through the TTL connection, you simply cannot get to the terminal prompt without the quick short of the "read channel".
Yes, that is just a matter of the value you attribute to your (lost ) data.
I have read many of the pages in this forum now and it looks like for my drive, apart from sending it to DR places, which would cost a lot for having messed with the ROM, I will only have the crude freezing or tapping methods.
Check my signature....
Do you have a way to search within the topics or the forum?