Seagate terminal access -- timing of read channel shorting

[LarrySabo]

I have a Grenada (ST2000DM001 9YN) with a media cache problem and I'm finding it impossible to get F3 T>, no matter when I short the read channel. I've tried shorting immediately before "(P) SATA Reset" and immediately after that, but no joy in either case. Tried holding the short for 5 - 10 seconds, and also for 5 - 10 minutes; also tried just waiting about an hour after that and still no command prompt. I did manage to get a command prompt once, shorting even earlier in the boot process but couldn't get it back after releasing the short.

I suspect head contamination but am holding off on opening the drive in case the customer wants another opinion. (I don't have a compatible donor whereas larger shops might.)

Any suggestions? Here's the terminal log (most empty lines removed)...

Boot 0x40M
Spin Up
TCC-0022[0x000065B4][0x00006A20][0x00006E8C]
Trans.
Rst 0x40M
MC Internal LPC Process
Spin Up
TCC-0022
<--- SHORTED Read Channel here; no joy

(P) SATA Reset
<--- also tried shorting here; no joy

MCMainPOR: Start:
Check MCMT Version: Current
MCMainPOR: Non-Init Case
MCMainPOR: EXCEPTION: MCMT PRI copy corrupt
MCMainPOR: MCMT SEC copy valid
Reconstruction: MCMT Reconstruction Start
Max number of MC segments 0A61
Nonvolatile MCMT sequence number 0000513A
[RSRS] 032F
ProcessRWError -Read- at LBA 0000000000029A47 Sense Code=40000087[RAA]!
Reconstruction: Completed 1:
[MCMTWS]
Rst 0x40M
MC Internal LPC Process
Spin Up
TCC-0022
LED:00000047 FAddr:FFFFFFFE
LED:00000047 FAddr:FFFFFFFE^z
^z
^z
^z (and many times more throughout)

LED:00000047 FAddr:FFFFFFFE <-- repeated indefinitely

 

[Jared]

Does the drive immediately get stuck busy when powered on, or does it come ready until you attempt reading ID?

I might be able to work a trick that doesn't require any read channel shorting.

 

[LarrySabo]

It immediately comes busy with power on.

 

[Sam]

You might try disabling all but head 0.

 

[LarrySabo]

[post]9725[/post] You might try disabling all but head 0.

Thanks for the reminder, Sam. I'll try that.

EDIT: Tried that and after 11x “FAIL Servo Op=0100 Resp=0003” the drive came ready. However, as soon as I try to calibrate ("Get Details" on DFL-SRP), it goes busy but retains DRD and DSC status. Hard reset clears Busy but it returns as soon as I try to calibrate.

Next, I disabled all but head 1 and drive never comes ready. It clicks 4 times, makes a flutter sound, and repeats this indefinitely. COM output is: Bad CRC Seg:0x05, Bad CRC Seg:0x22, followed by repeating LED:000000BB FAddr:00004A18.

In neither case do I get any of the normal boot process messages; shorting the read channel and issuing Ctrl+z during the above does nothing. It looks more like heads and/or media failure rather than media cache only. Because I don't have a compatible donor and the high cost of buying one ($315 CAD), I've suggested the client take it to another lab that is more likely to have one and is more experience dealing with these DM drives. I didn't open the drive to verify the contamination suspicion, so as not to prejudice the case.

 

[Jared]

Do you have PC-3000 Larry? I forget.

 

[Amarbir[CDR-Labs]]

Do you have PC-3000 Larry? I forget.

Well,
The Answer is No Cos i know what you were wanting to do .Mod the rom for the drive right ,but i had one case and even that method did not help

 

[LarrySabo]

[post]9728[/post] Do you have PC-3000 Larry? I forget.

No, just DFL-SRP. What mod did you have in mind, Amarbir?

 

[Amarbir[CDR-Labs]]

[post]9728[/post] Do you have PC-3000 Larry? I forget.

No, just DFL-SRP. What mod did you have in mind, Amarbir?

Larry ,
Sir PC 3000 Has 2 Mods That Mod The Rom So That You Can Short Read Channel And Get over with the case ,It did not work the only one time i tried on a seagate though

 

[LarrySabo]

Okay, thanks Amarbir. Is there an article in their Blog or some other reference that discusses this? It would be good to know just what they are modifying.