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HEAD Map change to Seagate Nas 4TB ST4000VN000
http://forum.hddguru.com/viewtopic.php?f=28&t=38260		 Page 1 of 1
Author:  magnetepazzo [ March 27th, 2019, 18:06 ]
Post subject:  HEAD Map change to Seagate Nas 4TB ST4000VN000
Hi guys, I have this unit with apparently bad head, when spin up i hear a little hiss and immediatly spin down. I have checked in a clean room the plates and the head, no show anything, apparently all are regular.
I would try to modify head mapping to disable single broken head, but I don't understand well how it is possible to make in MRT. Can anyone explain me how it's possible to make this ? Thanks to all.

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headmap2.JPG
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headmap1.JPG
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Author:  cpm0088 [ March 27th, 2019, 18:20 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
Can you get terminal log up? Do terminal commands work?
Author:  magnetepazzo [ March 27th, 2019, 18:43 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
no way, no level T, only log
Author:  cpm0088 [ March 27th, 2019, 18:47 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
You tried to short channel and stuff to get to terminal? Maybe heads are fine and module/modules have bad sectors.
Author:  magnetepazzo [ March 27th, 2019, 19:05 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
No I haven't try to make a shortpin, you know in this model witch pins are interested to hace access ? Thanks
Author:  fzabkar [ March 27th, 2019, 19:26 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
Tip: How to identify the Read Channel test points:
http://www.hddoracle.com/viewtopic.php?f=24&t=123

Isn't this one of those models with a locked terminal?
Author:  cpm0088 [ March 27th, 2019, 19:47 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
I believe it may be terminal locked, the terminal log should provide more info when doing ctrl z. its interesting to note your getting ID and serial number, just capacity is incorrect.
Author:  fzabkar [ March 27th, 2019, 20:16 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
cpm0088 wrote:
its interesting to note your getting ID and serial number, just capacity is incorrect.

The image shows a ROM dump. I expect that's the source of this info.
Author:  pcimage [ March 28th, 2019, 3:03 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
cpm0088 wrote:
I believe it may be terminal locked, the terminal log should provide more info when doing ctrl z. its interesting to note your getting ID and serial number, just capacity is incorrect.


The ID and S/N are coming from the ROM, you'd see that even if you only had the PCB connected.

The 3.86Gb is a default capacity given when the drive cannot read the SA at all. Which is usually either bad heads, non-native PCB (ROM) or damaged SA.

Given that that drive spins down, then it's almost certainly at least one bad head.

My first line of attack would be to microscopically examine the head sliders for contamination, I would bet that at least one would be contaminated with "platter dust" scraped from the surface.

For a partial recovery you could try disabling that head in ROM. For example if H3 is bad then change head map from 000102030405 to 000102020405.

Good luck!
Author:  magnetepazzo [ March 28th, 2019, 4:50 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
Thanks to all friend, I try. I think it's one head this disk are located in a nas no shocking no fallen down. The other nas disk work proprerly. I try . Thanks guys
Author:  magnetepazzo [ March 29th, 2019, 16:29 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
Hi Guys, today another same disk with same problem :-( no fallen down. This is the terminal log : FAIL Servo Op=0100 Resp=0007
0100 0000 0000 0001 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
ResponseFrame 17C0 004D 05B8 4500 0008 0000 0000 0000 0D1A 0000 0000 0000 0000 0000 0000 0000 E89A 6112 FFFF 2000 E187 0002 0000 0000 0000 2815 0000 007F 0006 0000 001A 0004 0010
FAIL Servo Op=0100 Resp=0007
0100 0000 0000 0001 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
ResponseFrame 1E80 004D 05B8 4480 0008 0000 0000 0000 0D32 0000 0000 0000 0000 0000 0000 0000 E89A 6112 FFFF 2000 E187 0002 0000 2815 0000 EB4E 0000 2443 0000 0020 001A 0005 0000

Suggestion ? I have see the head to microscope but no scratch nothing. Thanks
Author:  northwind [ March 30th, 2019, 6:42 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
The heads are gone.
Author:  pcimage [ April 2nd, 2019, 14:22 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
northwind wrote:
The heads are gone.


Absolutely
Author:  magnetepazzo [ April 3rd, 2019, 4:22 ]
Post subject:  Re: HEAD Map change to Seagate Nas 4TB ST4000VN000
Thanks friends
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