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 Post subject: 4F Uniqueness.
PostPosted: December 11th, 2018, 11:08 
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Hello every one,
I was tinkering around a JMVW. Following is the problem definition:-

Problem Definition:-


Take backup of a working Fblite of the entire SA and ROM by every way. Trying to use a donor rom of the same microcode and trying to ID the drive normally

Steps-Round 1

1) Fblite with normal operation was connected and SA+Rom was backed up nicely and zipped to preserve.
2) Donor rom code of same uC was flashed over the existing hdd.
3) Load ATA.



Observation-Round 1:-

Drive spins normally, DRD DSC. The moment after DRD DSC when auto get detailed button is clicked, the drive starts making high frequency scratching like noise (sssssssss)
No capacity and no ID, no mod access.

None of the loaders upload. Shows failed to upload.
Loading 01(original) in RAM and list fails to give SA access as the light status changes from DRD DSC to DRD DSC DRQ.

Steps-Round 2
1)Get DRD DSC, go in kernel so SA is not sought. Bypass SA in ROM by manipulating mod 30 and reboot.
2)Faster DRD DSC, Auto get details.
3)Load ATA.

Observation-Round 2:-
1)DRD DSC status is achieved faster.
2)ATA LOADED nicely..all mods 11 etc etc.

Loaded 01(original) in ram and tried to access SA but same status flags are lit.
Tried to read tracks. No luck..

Steps-Round 3
1)Flash Donor ROM code again to neutralize all changes done previously.
2)One by one patch each and every original rom module to see where the drive IDs.

Observation-Round 3:-

It was Module 4F that is solely required to get access to SA. Drive IDed normally after 4F is put. SA access is independent of every other module (depending unless you wish to bypass 30).
The moment original 4F is patched, there is all christmas but when donor 4F is used, the drive loses its ID.
With original 4F drive is not at all noisy. Non original 4F causes noise in such drives SYMPTOM TO BE NOTED.


Steps-Round 4
1)Get drive to ID normally by using original modules.
2)Analyze original 4F and eliminate blocks of data by zero filling and generating checksum and writing it back to locate important portions which enable the heads to read the data.

Observation-Round 4:-
The required region is located in the displayed offset as highlighted in the pictures.
Now the noises are a little different as each bit is zero filled from right to left one by one and the ID is checked. As it tends to the threshold digit, the SA access becomes a slower process as the adaptive are lost. If the threshold digit is changed, ID is lost.

Conclusion:-:-
The highlighted area in the edited 4F photograph displays the threshold point. Any change made beyond this point has less effect on the SA. Any changes made before this point or at this point can disallow SA access.



Thanks.


Attachments:
Edited 4F.png
Edited 4F.png [ 183.78 KiB | Viewed 2923 times ]
Original 4F.png
Original 4F.png [ 143.34 KiB | Viewed 2926 times ]
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 Post subject: Re: 4F Uniqueness.
PostPosted: December 11th, 2018, 14:41 
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Could you upload the BIN file for module 0x4F? ISTM that, rather than deleting bytes at random, we should try to make sense of any groups of data. For example, I can see that there are several sections consisting of 4 records, where each record is associated with a particular head.

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 11th, 2018, 15:20 
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Here is the original 4F and donor 4F.


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 Post subject: Re: 4F Uniqueness.
PostPosted: December 11th, 2018, 15:51 
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I had already started analysing a 4F module (see attachment). ICBW, but these are the groups as I see them.

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000030                           5248 0400 4222
00000040  AA22 9D22 5B22

4222   head #0
AA22
9D22
5B22   head #3

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000040                 55AA 0400 69FE B3EF 3000
00000050  AAFC F2FF AEFF A600 FAFE 4200 B8FE D004
00000060  C1F0 3C01 24FB 0101 4000 65FF 96FF DAFD
00000070  E201 DB04 FFEC E8FF 45FB 57FE 0B00 5400
00000080  1003 5CFF 89FE F905 55EB 7601 FFF9 B400
00000090  2B00 F900 7300 A1FE C400 0340

69FE B3EF 3000 AAFC F2FF AEFF A600 FAFE 4200 B8FE   head #0
D004 C1F0 3C01 24FB 0101 4000 65FF 96FF DAFD E201
DB04 FFEC E8FF 45FB 57FE 0B00 5400 1003 5CFF 89FE
F905 55EB 7601 FFF9 B400 2B00 F900 7300 A1FE C400   head #3
0340

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000090                           0340 80AA D80E
000000A0  3A01 D80E 3A01 D80E 3A01 D80E 3A01 0000
000000B0  0000 0000 0000 0000 0000 0000 0000
                                             4613
000000C0  3A01 4613 3A01 4613 3A01 4613 3A01 0000
000000D0  0000 0000 0000 0000 0000 0000 0000

D80E 3A01   head #0
D80E 3A01
D80E 3A01
D80E 3A01   head #3
0000 0000
0000 0000
0000 0000
0000 0000

4613 3A01   head #0
4613 3A01
4613 3A01
4613 3A01   head #3
0000 0000
0000 0000
0000 0000
0000 0000

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

000000F0                                     7B27
00000100  3A01 7B27 3A02 7B27 3A02 8E28 3A02 0000
00000110  0000 0000 0000 0000 0000 0000 0000
                                             532B
00000120  3A02 352B 3A01 352B 3A01 902A 3A02 0000
00000130  0000 0000 0000 0000 0000 0000 0000

7B27 3A01   head #0
7B27 3A02
7B27 3A02
8E28 3A02   head #3
0000 0000
0000 0000
0000 0000
0000 0000

532B 3A02   head #0
352B 3A01
352B 3A01
902A 3A02   head #3
0000 0000
0000 0000
0000 0000
0000 0000

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

000001C0  90AA 0000 80C4 F314 875F 1215 5BB8 1A15
000001D0  729B 1915 4643 F005 59DB 7F05 FD4E 8405
000001E0  FD4E 8405

80C4 F314 875F 1215   head #0
5BB8 1A15 729B 1915
4643 F005 59DB 7F05
FD4E 8405 FD4E 8405   head #3

I don't know what the following data mean. 0x55AA and 0x80AA, 0x90AA appear to be signatures of some kind.

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000200  97FF 55AA 0000 0000 0000 0000 0000 0000
00000210  0000 0000 0000 0898 AA0A 0000 0000 0000
00000220  0000 0000 0000 0000 0000 0000 0000 0000


Attachments:
4F.7z [342 Bytes]
Downloaded 52 times

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 11th, 2018, 17:13 
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@sin, I would compare your 0x4F modules against those from models with different numbers of heads. That should shed more light on the module's structure.

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 11th, 2018, 18:24 
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4F module from WD20NMVW-11AV3S0

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000050       5248 0800 6423 4723 9023 4B23 5923  ..RH.........
                    ^^^^ 8 heads
00000060  0F23 6F23 9E23

Code:
6423   head #0
4723
9023
4B23
5923
0F23
6F23
9E23   head #7

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000060                 55AA 0800 EDFF 35E6 AFFD
                              ^^^^ 8 heads
00000070  C9FA 3200 B6FF 6800 F900 7A01 38FF EB04
00000080  09E2 DFFE C4FB 94FE 2A01 CB00 4900 2A00
00000090  B1FF E900 6DE4 8AFE B7FC 3AFE 15FF 0201
000000A0  D400 5101 6100 2306 74E2 AF00 DFFD 91FF
000000B0  C8FE FC00 6501 5CFE 1D00 5EFF 31E4 2FFF
000000C0  0AFB 4C00 9DFE 4201 4003 45FF 8CFF 8204
000000D0  69E0 8BFF 02FB 3200 2A02 9A00 7901 F5FE
000000E0  72FF 3901 F4E2 4EFF 0AFB 7100 7901 28FF
000000F0  3301 EB00 4D00 F804 90E3 64FF 3AFA C3FE
00000100  FAFF 1F00 4702 1100 5300 0180

Code:
EDFF 35E6 AFFD C9FA 3200 B6FF 6800 F900 7A01 38FF   head #0
EB04 09E2 DFFE C4FB 94FE 2A01 CB00 4900 2A00 B1FF
E900 6DE4 8AFE B7FC 3AFE 15FF 0201 D400 5101 6100
2306 74E2 AF00 DFFD 91FF C8FE FC00 6501 5CFE 1D00
5EFF 31E4 2FFF 0AFB 4C00 9DFE 4201 4003 45FF 8CFF
8204 69E0 8BFF 02FB 3200 2A02 9A00 7901 F5FE 72FF
3901 F4E2 4EFF 0AFB 7100 7901 28FF 3301 EB00 4D00
F804 90E3 64FF 3AFA C3FE FAFF 1F00 4702 1100 5300   head #7
0180

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000100                                80AA 3011
00000110  3701 3011 3701 B90F 3702 B90F 3702 B90F
00000120  3702 B90F 3703 B90F 3702 3011 3701

Code:
3011 3701   head #0
3011 3701
B90F 3702
B90F 3702
B90F 3702
B90F 3703
B90F 3702
3011 3701   head #7

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000230  90AA 0000 B191 7DF2 9AAE 7EF2 5624 88F2
00000240  CBB2 88F2 B2B0 83F2 C993 82F2 F63A 7AF2
00000250  DF57 7BF2 4A2A 55FF BFB8 55FF 3347 56FF
00000260  610D 54FF 1C64 57FF D12C 9FFF 0012 A3FF
00000270  BB68 A6FF

Code:
B191 7DF2   head #0
9AAE 7EF2
5624 88F2
CBB2 88F2
B2B0 83F2
C993 82F2
F63A 7AF2
DF57 7BF2   head #7

4A2A 55FF   head #0
BFB8 55FF
3347 56FF
610D 54FF
1C64 57FF
D12C 9FFF
0012 A3FF
BB68 A6FF   head #7


Attachments:
4F.7z [417 Bytes]
Downloaded 52 times

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 11th, 2018, 18:28 
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4F module from WD2002FAEX-00MJRA0

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000050                                     5248  ..............RH
00000060  0600 FA21 BA20 EC20 C51F 2720 4520 0000
          ^^^^ 6 heads
00000070  0000 0000 0000

Code:
FA21   head #0
BA20
EC20
C51F
2720
4520   head #5
0000
0000
0000
0000

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000070                 55AA 0600 7421 59F4 B8FD
                              ^^^^ 6 heads
00000080  9FF6 EFFE 9100 7B01 C400 0A00 12FF A4F5
00000090  35EE 9401 29FB 0701 DA00 C8FE 56FF 8601
000000A0  1CFF B01D 0FEF C6FE 34F5 06FE 5502 D9FF
000000B0  4000 8900 ACFF CFEA 76EF 9000 38F8 A500
000000C0  66FF 5C00 0500 A600 7000 B00D F2F1 E1FE
000000D0  6CFA 64FF CE00 03FF CAFF E9FE 6C00 5DEE
000000E0  B0F8 5EFF 28F9 0001 6DFF EEFF BB01 D300
000000F0  CAFF 0000 0000 0000 0000 0000 0000 0000
00000100  0000 0000 0000 0000 0000 0000 0000 0000
00000110  0000 0000 0000 0000 0000 0000 0000 0000
00000120  0000 0000 0000 0000 0000 0000 0000 0000
00000130  0000 0000 0000 0000 0000 0000 0000 0000
00000140  0000 0340

Code:
7421 59F4 B8FD 9FF6 EFFE 9100 7B01 C400 0A00 12FF   head #0
A4F5 35EE 9401 29FB 0701 DA00 C8FE 56FF 8601 1CFF
B01D 0FEF C6FE 34F5 06FE 5502 D9FF 4000 8900 ACFF
CFEA 76EF 9000 38F8 A500 66FF 5C00 0500 A600 7000
B00D F2F1 E1FE 6CFA 64FF CE00 03FF CAFF E9FE 6C00
5DEE B0F8 5EFF 28F9 0001 6DFF EEFF BB01 D300 CAFF   head #5
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 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
0340

Code:
Offset(h) 00   02   04   06   08   0A   0C   0E

00000280                 0100 9110 2A11 7811 FB12
00000290  2711 0113 0010 0010 0010 0010 3841 F23E
000002A0  DB3D EC38 FD3E D938 8743 8743 8743 8743

Code:
9110   head #0
2A11
7811
FB12
2711
0113   head #5
0010
0010
0010
0010

3841   head #0
F23E
DB3D
EC38
FD3E
D938   head #5
8743
8743
8743
8743


Attachments:
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 Post subject: Re: 4F Uniqueness.
PostPosted: December 12th, 2018, 16:10 
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sin wrote:
Conclusion:-:-
The highlighted area in the edited 4F photograph displays the threshold point. Any change made beyond this point has less effect on the SA. Any changes made before this point or at this point can disallow SA access.

This observations seems contrary to expectations. AIUI, this last section of the module contains the adaptives for the dual stage actuator. :?

https://forum.acelaboratory.com/viewtopic.php?t=9854
viewtopic.php?f=1&t=35523

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 12th, 2018, 16:17 
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fzabkar wrote:
Code:
80C4 F314 875F 1215   head #0
5BB8 1A15 729B 1915
4643 F005 59DB 7F05
FD4E 8405 FD4E 8405   head #3

... or this ?

Code:
80C4 F314   head #0
875F 1215
5BB8 1A15
729B 1915   head #3

4643 F005   head #0
59DB 7F05
FD4E 8405
FD4E 8405   head #3

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 12th, 2018, 16:43 
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Have been playing a bit with this today as I had a spare half hour.

Two drives of same fw version and 1 day apart in manufacture date, non-native 4F prevents drive from working.

When I get some more time, I’ll try and figure out which are the most important sections of it. But it may take a lot of trial and error!

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 12th, 2018, 17:15 
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pcimage wrote:
When I get some more time, I’ll try and figure out which are the most important sections of it. But it may take a lot of trial and error!

Assuming my observations are correct, I would limit any edits to the primary head. I would select one particular adaptive value and then adjust it up and down until the drive fails to ID. This will tell you the sensitivity (tolerance) of each adaptive. There may be better approaches, though.

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 13th, 2018, 0:07 
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If the dual-stage actuator is the reason for the extra adaptives, then could the problem of a missing ROM be solved with donor heads and donor head adaptives?

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 13th, 2018, 5:26 
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Hi there sorry for the delay in reply. You have done amazing job of dissection of 4F. Great amount of my love and respect for that.

fzabkar wrote:
sin wrote:
Conclusion:-:-
The highlighted area in the edited 4F photograph displays the threshold point. Any change made beyond this point has less effect on the SA. Any changes made before this point or at this point can disallow SA access.

This observations seems contrary to expectations. AIUI, this last section of the module contains the adaptives for the dual stage actuator. :?

https://forum.acelaboratory.com/viewtopic.php?t=9854
viewtopic.php?f=1&t=35523


Possible, the conclusion can go wrong. Hence I need more people to try out chopping all the things in 4F but just staying consistent with the last portion and further comment on functionality.


pcimage wrote:
Two drives of same fw version and 1 day apart in manufacture date, non-native 4F prevents drive from working.


Great info thanks.
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 Post subject: Re: 4F Uniqueness.
PostPosted: December 13th, 2018, 5:29 
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fzabkar wrote:
If the dual-stage actuator is the reason for the extra adaptives, then could the problem of a missing ROM be solved with donor heads and donor head adaptives?


I have exactly the same thing in my mind. If the 4F is locked to one set of physical heads. May be swapping heads with an appropriately matched drive and using the donor 4F maybe could locate the servo tracks and start to read the SA?

Feels like buying two Fblites and trying out swapping heads.....
The major problem is, when some one delibrately overwrites the ROM code with a donor without having original patient rom backup.
Has any one got success cracking such cases? It will be inspirational personally.


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 Post subject: Re: 4F Uniqueness.
PostPosted: December 13th, 2018, 6:32 
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fzabkar wrote:
pcimage wrote:
When I get some more time, I’ll try and figure out which are the most important sections of it. But it may take a lot of trial and error!

Assuming my observations are correct, I would limit any edits to the primary head. I would select one particular adaptive value and then adjust it up and down until the drive fails to ID. This will tell you the sensitivity (tolerance) of each adaptive. There may be better approaches, though.



Very well said.

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 13th, 2018, 6:37 
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So what I will try tomorrow is, I shall bypass the SA in rom and just keeping head 0 or head 1 engaged while only manipulating the values as marked by you.
Thanks for the idea.

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 13th, 2018, 15:38 
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It might be interesting to see how a drive behaves if we could disable the piezo actuator, assuming this is the problem. I'm wondering whether disabling this second stage actuator would still allow the drive's primary actuator to follow the track. Perhaps this would be a better approach than feeding incorrect adaptives to the secondary actuator.

That said, the HDA connector doesn't appear to have any aditional pins (18), so I am at a loss to understand how the piezoelectric transducers are driven. I would expect that the motor controller would generate a driving voltage, and that this single voltage source would be multiplexed to the selected head via an IC on the headstack. Alternatively, it could be that all PZTs are activated at the same time.

Perhaps a photo of the preamp would help?

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 14th, 2018, 18:42 
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sin wrote:
So what I will try tomorrow is, I shall bypass the SA in rom and just keeping head 0 or head 1 engaged while only manipulating the values as marked by you.

I think my suggestion may have been ambiguous. I'm suggesting that you confine your edits to head #0, leaving all other heads unchanged.

BTW, could you identify the SA module that MRT uses to rebuild 4F?

Image

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 Post subject: Re: 4F Uniqueness.
PostPosted: December 16th, 2018, 14:50 
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fzabkar wrote:
It might be interesting to see how a drive behaves if we could disable the piezo actuator, assuming this is the problem. I'm wondering whether disabling this second stage actuator would still allow the drive's primary actuator to follow the track. Perhaps this would be a better approach than feeding incorrect adaptives to the secondary actuator.

That said, the HDA connector doesn't appear to have any aditional pins (18), so I am at a loss to understand how the piezoelectric transducers are driven. I would expect that the motor controller would generate a driving voltage, and that this single voltage source would be multiplexed to the selected head via an IC on the headstack. Alternatively, it could be that all PZTs are activated at the same time.

Perhaps a photo of the preamp would help?
.




Aye Aye Captain. I shall try this and post my findings here.It has to be multiplexing, they can multiplex a voltage level surely, but to drive a whole set of coil to move something around, they may require some amount of current too as just voltage won't just do enough. So may be at the same time,when the voltage gets multiplexed, the current is feed by the servo IC(voltage controlled current source which is taking its voltage input feed from the multiplexed voltage. Once voltage detected, due current is pushed from the servo IC to move the coils??? Who knows?
I think a great deal of multiplexing is done to read from so many heads one by one while keeping the pin count constant to company mfg standards. However, multiplexing of a current line instead? sounds quite out of my experience tbh.
Or is it that very small current is required to drive this coil and the required current can be pulled from this multiplexed voltage source itself.
no idea.

Was just caught up with the conclusion of 7th semester exams and hence could not reply in time.

I have a friends NMVW which he just give away for a small amount...I haven't tested it for uniqueness as we are currently imaging the drive so that he can move his data to his bigger drive.
Let me see if the uniqueness applies here too.

Let me see if I can send you a snap of heads etc.

But why do I have a feeling (or lack of experience possibly) that there are no secondary set of heads.


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 Post subject: Re: 4F Uniqueness.
PostPosted: December 16th, 2018, 15:46 
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sin wrote:
But why do I have a feeling (or lack of experience possibly) that there are no secondary set of heads.

Maybe I'm mangling the terminology, but I'm referring to head #0 as the primary head while all others are secondary.

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