Recently I have been trying to practice some disk forensics on a HDD that a company shipped out to me, and I've found myself a little stumped. The issue I'm running into is essentially my home system can no longer recognize the HDD (at POST, nothing happens) so I'm assuming that I have a BSY error going on. I've been able to get a serial console working by using an FT232 chip and putty connection on COM port 9 (with windows) or /dev/ttyUSB0 on linux.
Previously, the HDD was able to mount successfully onto windows and I was able to recover flash software as well as the correct .lod files for firmware flashing, but at some point, the HDD became unusable via normal SATA/USB connection.
The issue I'm running into now is that in the serial console (tx/rx 4 pin connection), there is custom code running with a continuous message telling me to "patch me!" that I believe is interfering with the ctrl+z method to open console controls. I believe that the tx connection from the FT232 device is working (there's a small blipping light everytime I press a keyboard function while connected to the console). The problem with this is that in order to patch (I believe) I need to flash .lod firmware onto the drive, but because it's BSY, I can't mount it to /dev/sg# nor does windows recognize it as a device.
Is there anyway to force a ctrl+z signal to the console? Or am I locked out for good here? Are there any tools that can further examine the serial port aside from, or ontop of PuTTy?
Model No. Seagate ST3160318AS
SATA + 4pin serial connector (tx,rx,gnd,bitspeed)
FT232 connection:https://tinkersphere.com/electronic-com ... elper.html
baud : 38400
PCB ---- FT232 => laptop
tx . ----- . rx
rx . ----- . tx
gnd . --- . gnd