[The Solution for Seagate 7200.11 HDDs]

I have no knowledge of the HDD electronics but looking at the instructions for making the serial connection one thing worries me a bit. I see it is suggested to use 5V for powering that circuitry. This means that the serial signal logic levels to the HDD would also be 5V. I don't know what is the I/O voltage for the IC on the HDD controller board but these days they are usually 3.3V or less. If there isn't any protection on board then using 5V levels could potentially damage the I/O pins.

I agree this schematic uses zener diodes. Probably the best way is to use USB to rs232(TTL-3V3) cable like Nokia DKU-5, consult this and this

Regards

[Seagate Barracuda 7200.11 Troubles]

Press Ctrl+Z to get: T> command prompt.

Then type this:

T>/2 (Enter)

2>S006b (Enter)

2>R21,01 (Enter)

2>C0,570 (Enter)

2>W20,01 (Enter)

Gradius

I doubt this will fix 7200.11 drive, it seems to be a fix for old ST310014ACE (to unlock passworded drive I guess) look here

Regards