fzabkar wrote:
I suspect that this drive uses Two-dimensional Magnetic Recording (TDMR), but the product manual makes no mention of it:
https://www.seagate.com/www-content/product-content/barracuda-fam/barracuda-new/en-us/docs/100805918n.pdfTherefore I expect that there would be two read channels and one write channel. ISTM that shorting either A or B should be enough.
I would measure the voltages with respect to ground at each of the read and write channel test points, with the PCB both on and off the HDA.
BTW, isn't the terminal locked in this model?
Thank you for the reply!
This drive have one or more bad heads (makes noise of bad head). Terminal response below:
FAIL Servo Op=02A5 Resp=0003
02A5 B318 0003 7FFF 7FFF 7FFF 001C 1A59 373B 0000 42BC 3B00 FFFF 0020 0000 0000 0000 004D 0000 0000 0000 F590 419A 0037 0000 7000 0000 0000 0000 0000 0000 0000
ResponseFrame 0000 0001 FFFF 76AB E0D4 0000 0000 0000 0CA6 0011 CE00 0000 3A00 001A 1130 0225 41EE 0E65 0018 41EE FFFF 1000 E0D4 0002 0003 B318 0000 8001 0001 1000 0019 0000 FFFF Loop=1000
RECOV Servo Op=02A5 Resp=0005
UnRecoveredSeekErrorHandling
And I cant access the terminal directly with CTRL + z, so i think in try make the short to access the terminal.
This drive seems to be quite difficult to change the head. And I would like to make a few attempts to acccess through the terminal before trying this.