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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: September 28th, 2023, 18:08 
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fzabkar wrote:
You would need to measure the voltage across the resistor in differential mode (ie subtract channel 1 from channel 2).
It seems there's a Math Menu where one should be able to specify something like that. Looks like I'll have to do a bit of reading. Or a lot. :D

fzabkar wrote:
BTW, did you disturb the eBay drive in any way before it went bad?
I did remove the PCB (for taking photos) and reinstall it, before I tried to power up the drive for the first time. I don't think there were e.g. any ESD mishaps, but I guess I can't be 100% sure.
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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: September 29th, 2023, 15:04 
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So, if I
- use a SATA-USB bridge (whose PSU has no earth pin) to power the drive,
- leave the USB cable disconnected

... then I can ignore the ground clips of the oscilloscope's ch1 and ch2 probes and not connect them anywhere (they are, however, internally connected to each other). Then I would just put one probe on each side of the VCM current sensing resistor and tell the 'scope to calculate and plot the difference between the two waveforms. If possible, maybe even tell the 'scope to divide the difference by 470?
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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 1st, 2023, 6:09 
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The BZZ BZZ sound doesn't seem to be coming from the center of the platters, but more from the corner of the drive, under the PCB.

However, masking off the 4 motor terminals does remove the BZZ BZZ sound completely.

Masking off the two VCM pins of the 20-pin HDA connector removes the bump+click sound that usually comes after the 6 x BZZ.

Do these observations give any hints as to what's going on?
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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 1st, 2023, 8:14 
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Quick test without moving ROM chips: The PCB of the non-working eBay drive spins up a good eBay drive just fine, so apparently I did not manage to destroy that board while taking pics.
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fzabkar
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 1st, 2023, 19:00 
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It sounds like your bad eBay drive has developed a spindle motor problem. Nice troubleshooting, BTW.

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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 13th, 2023, 14:31 
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Some more notes on the 2TB Hitachi HUA723020ALA641.

Just for fun, I tried to dump one of these ROM chips having it in circuit. Using a clamp seemed pretty much hopeless, so I soldered 8 wires directly to the legs of the chip and checked and double-checked my soldering. No luck. Then I desoldered the chip from the PCB and got a good read right away.

According to what I've been told, I was wrong before when I said this drive has 5 platters. For the 7K3000 product line, it seems it's only the top-of-the-line 3TB drive that uses 5 platters.

This 2TB version supposedly uses the same 10-head headstack as the 3TB version, but the 2TB drive has only 4 platters.

Using 7 surfaces (or heads) instead of 10 would imply a roughly (3/10) * 3TB = 0.9 TB lower capacity. 3-0.9 = 2.1TB. Hmm, well, yeah, something like that, maybe. :P

Apparently the head configuration can vary from drive to drive!? That is, they didn't choose 7 out of 10 heads in the same way in all HUA723020ALA641 drives. And this may make finding a proper donor a slightly more challenging task than usual.

Would anybody like to comment on this?
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fzabkar
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 14th, 2023, 16:13 
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Your ROM dumps should contain head maps.

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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 15th, 2023, 4:59 
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Something along these lines, maybe (just a wild guess)?
Code:
I:\test>hitachitest002.exe 001_jun2012.bin
0x02000; 'E2PR0007MK7XB840      KM1017FYMH0LAG'  --> descramble --> serial: YFHML0GA ; hda bar code?: MK0171
0x02b3e; 04 05 06 07 08 02 03 0F 0F 0F  <-- possibly head map?
0x03000; 'E2PR0007MK7XB840      KM1017FYMH0LAG'  --> descramble --> serial: YFHML0GA ; hda bar code?: MK0171
0x03b3e; 04 05 06 07 08 02 03 0F 0F 0F  <-- possibly head map?
0x7f000; 'PN_LOGEX0J14078BA4443AP7S2210GRDPN_LOGAC                        '
           --> pcb sticker: 0J14078 ; BA4443A ; P7S221 ; 0GRD

I:\test>hitachitest002.exe 002_jul2012.bin
0x02000; 'E2PR0007MK7XB840      KM1017FYVH6ZA3'  --> descramble --> serial: YFHVZ63A ; hda bar code?: MK0171
0x02b3e; 04 05 06 07 08 02 03 0F 0F 0F  <-- possibly head map?
0x03000; 'E2PR0007MK7XB840      KM1017FYVH6ZA3'  --> descramble --> serial: YFHVZ63A ; hda bar code?: MK0171
0x03b3e; 04 05 06 07 08 02 03 0F 0F 0F  <-- possibly head map?
0x7f000; 'PN_LOGEX0J14078BA4443AP822250KW6PN_LOGAC                        '
           --> pcb sticker: 0J14078 ; BA4443A ; P82225 ; 0KW6

I:\test>hitachitest002.exe 003_jul2012bzzbzz.bin
0x02000; 'E2PR0007MK7XB840      KM1017FYVH4NAZ'  --> descramble --> serial: YFHVN4ZA ; hda bar code?: MK0171
0x02b3e; 04 05 06 07 08 02 03 0F 0F 0F  <-- possibly head map?
0x03000; 'E2PR0007MK7XB840      KM1017FYVH4NAZ'  --> descramble --> serial: YFHVN4ZA ; hda bar code?: MK0171
0x03b3e; 04 05 06 07 08 02 03 0F 0F 0F  <-- possibly head map?
0x7f000; 'PN_LOGEX0J14078BA4443BP78228201RPN_LOGAC0J14078BA4443BP78228201R'
           --> pcb sticker: 0J14078 ; BA4443B ; P78228 ; 201R

I:\test>hitachitest002.exe 004_feb2012.bin
0x02000; 'E2PR000UMKUXB840      KM2017GYPGXNAM'  --> descramble --> serial: YGGPNXMA ; hda bar code?: MK0271
0x02b3e; 04 05 06 07 08 09 03 0F 0F 0F  <-- possibly head map?
0x03000; 'E2PR000UMKUXB840      KM2017GYPGXNAM'  --> descramble --> serial: YGGPNXMA ; hda bar code?: MK0271
0x03b3e; 04 05 06 07 08 09 03 0F 0F 0F  <-- possibly head map?
0x7f000; 'PN_LOGEX0J14078BA4443_PMZ205TTP0PN_LOGAC                        '
           --> pcb sticker: 0J14078 ; BA4443_ ; PMZ205 ; TTP0

I:\test>hitachitest002.exe 005_sep2011.bin
0x02000; 'E2PR000UMKUXB840      KM2013GY3GG6A5'  --> descramble --> serial: YGG36G5A ; hda bar code?: MK0231
0x02b3e; 04 05 06 07 08 09 03 0F 0F 0F  <-- possibly head map?
0x03000; 'E2PR000UMKUXB840      KM2013GY3GG6A5'  --> descramble --> serial: YGG36G5A ; hda bar code?: MK0231
0x03b3e; 04 05 06 07 08 09 03 0F 0F 0F  <-- possibly head map?
0x7f000; 'PN_LOGEX0J14078BA3967AP6y13704K5PN_LOGAC                        '
           --> pcb sticker: 0J14078 ; BA3967A ; P6y137 ; 04K5

Or in table form:
Attachment:
Image10.png
Image10.png [ 19.44 KiB | Viewed 14429 times ]

These observations could possibly suggest that e.g. YGGPNXMA wouldn't be a suitable donor for YFHML0GA. But why, though? What part would supposedly be incompatible?
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mr44er
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 15th, 2023, 6:16 
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Would a Hitachi HDS723020BLA642 be of any usage?
It ran in one of my storages until yesterday, got its first defect sectors and then I replaced it. I'm not there right now, but the sticker said 2011 and I hope it hasn't been disposed of there yet.

smartctl from another remaining disk:
=== START OF INFORMATION SECTION ===
Model Family: Hitachi Deskstar 7K3000
Device Model: Hitachi HDS723020BLA642
Serial Number: xxx
LU WWN Device Id: xxx
Firmware Version: MN6OAA10
User Capacity: 2,000,398,934,016 bytes [2.00 TB]
Sector Size: 512 bytes logical/physical
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Device is: In smartctl database 7.3/5319
ATA Version is: ATA8-ACS T13/1699-D revision 4
SATA Version is: SATA 2.6, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Sun Oct 15 12:15:28 2023 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM feature is: Unavailable
APM feature is: Disabled
Rd look-ahead is: Enabled
Write cache is: Enabled
DSN feature is: Unavailable
ATA Security is: Disabled, NOT FROZEN [SEC1]
Wt Cache Reorder: Enabled
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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 16th, 2023, 15:00 
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Posts: 42
Location: Finland
Thanks, but the Ultrastar seems to differ quite a bit from the Deskstar both electronically and mechanically.

In any case, I'm quite confident that I have ONE proper donor in my list above. That is, YFHVZ63A should be a suitable donor for the patient YFHML0GA.

Of course, the offsets 0x02b3e and 0x03b3e for the head map were just a wild guess, but maybe not such a bad one ... ?

If those are indeed the head maps, I guess it looks like heads 0 and 1 would be physically missing in all five listed drives. Additionally, one of the heads actually present in the drive will have been disabled in the ROM; seemingly head 9 for the drives marked with green and head 2 for the drives marked with yellow.

Or maybe I'm completely on the wrong track. :D
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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 28th, 2023, 5:53 
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Posts: 42
Location: Finland
So, to summarize ... an external 2TB 3.5" 7200rpm HDD was sitting on my desk from Aug-2017 to Aug-2023, running almost constantly, always working flawlessly. Never abused in any way. Suddenly found dead one morning with a burnt SATA-USB bridge and signs of overheating in the motor controller area on the HDD's PCB.

After PCB swap (and ROM transfer), when you try to power up this HUA723020ALA641 JUN-2012 drive, you just hear 6 x BZZZ plus a soft bump+click sound.

It seems the BZZZ sound is coming more from the corner of the drive (where the head assembly magnets are?) and not from the center of the platters.

The drive (still never opened, dropped or otherwise abused) has now been sent to a DR company in Europe.

Anybody want to guess what diagnosis they arrived at? :P
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fzabkar
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: October 29th, 2023, 13:59 
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Seized motor?

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nc513
 Post subject: Re: Dead Hitachi HUA723020ALA641 2TB 3.5" 7200rpm (Jun-2012)
PostPosted: November 29th, 2023, 6:45 
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They are saying the motor was fine. Also:

- Heads were parked properly on the ramp when they received the drive.
- Still, all heads showed signs of severe damage.
- One of seven surfaces was almost completely unreadable.
- Recovery required head transplant only.

Somehow that does not feel entirely logical for a drive that has NEVER seen any kind of abuse. It had been running 24/7 in a safe place ever since January 2023, until I suddenly found it dead one morning.

Ticket status went something like this:

- Patient received.
- Diagnosis: Head damage.
- Attempting recovery using DR company's parts.
- Updated diagnosis: Head damage, surface damage.
- Parts could not be used. Now attempting recovery using parts from donor drive provided by customer.
- Extracting data.
- File list waiting for customer's acceptance.
- Result accepted and paid.
- Drives returned to customer.

If they're saying one surface is now badly scratched and unrecoverable (causing about 15% corruption in all really large files), that's probably true. What actually caused it - that's another question. :?
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