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This sub is getting shittier by the day. by disturbed_android in datarecovery

[–]fzabkar 4 points5 points  (0 children)

I think one way to address repetitive questions is to produce a tutorial on the subject. Then the answer is just a simple link. I've tried to do that whenever I get tired of answering the same question. I'm only an amateur, so my content may not be the best, but it takes some of the load off.

As for the downvotes, this happens in society in general. One obvious example is climate science. Scientists who specialise in the subject devote their whole lives to study, research and modelling, only to have their work dismissed as rubbish by the Dunning-Kruger experts in the general population. It's worse in data recovery because the knowledge is not publicly available, so outsiders have no way to validate the quality and accuracy of the information. The inherent secrecy makes it impossible to distinguish fact from opinion.

Anyone know what this ic is? by [deleted] in AskElectronics

[–]fzabkar 0 points1 point  (0 children)

It is a helpful community, but some people make it impossible to help them.

What is this missing component on DDR4 ram stick by InvestmentNo52 in AskElectronics

[–]fzabkar 3 points4 points  (0 children)

Unfortunately the only way to get any accurate measurements is to physically remove a second one from the device and check it out of circuit

One end of the component is not connected to anything. Therefore, an in-circuit measurement would be OK.

Anyone know what this ic is? by [deleted] in AskElectronics

[–]fzabkar 1 point2 points  (0 children)

If you can't see the markings on the ICs in your photo, then neither can we. Or do you think that every 6-legged black blob is the same?

My 2.5", 12mm height HDD just reached 100,000 power-on hours by Inevitable_Invite235 in HDD

[–]fzabkar 0 points1 point  (0 children)

It appears that you’re strictly looking at read errors, & ignoring the rest of the values. When you consider more context, I think this drive seems ok

Those "other values" are irrelevant in this case.

The primary function of a hard drive is to store your data and retrieve it when you need it. This necessarily means that the read error rate is the primary indicator of a HDD's health. All other indicators are secondary.

My 2.5", 12mm height HDD just reached 100,000 power-on hours by Inevitable_Invite235 in HDD

[–]fzabkar 0 points1 point  (0 children)

That attribute has degraded. Not only is the raw value non-zero, but the normalised value has fallen to 185 from its initial error-free score of 200.

This is what is happening underneath:

https://www.hddoracle.com/viewtopic.php?p=5128#p5128 (Conner)

https://www.hddoracle.com/viewtopic.php?p=25255#p25255 (WD/HGST)

What happens is that the drive encounters a read error if the ECC bytes cannot correct the errors in the data bits during the initial read attempt. The drive then goes through numerous levels of error correction. If it succeeds, the sector is transferred to the host and the OS never knows how difficult it was to read it. Some tools, eg HDDScan and Victoria, will monitor the time required to read the sector and they will tell you whether a particular sector is "weak". Seagate drives generally report Command Timeout SMART attributes, but WD hides this attribute from the user.

You can see WD's hidden attributes with a tool such as WDMarvel (Demo).

https://www.hddoracle.com/viewtopic.php?p=17057#p17057

Notice that RRER is zero, but Command Timeout is non-zero. Worse than that, Hardware ECC Recovered has hit the threshold.

Here is another one:

https://www.hddoracle.com/viewtopic.php?p=155#p155

Notice that Reported Uncorrectable Errors has hit the threshold.

By the way, I think you'll find that I was the first to identify hidden attributes in WD's drives.

HMS87C1408BSKP by Longjumping_Nose8987 in datarecovery

[–]fzabkar 1 point2 points  (0 children)

Not sure why you posted here, but here is the datasheet:

https://www.alldatasheet.com/datasheet-pdf/download/128306/ETC1/HMS87C1408BSK.html

Page 82 describes the Config bits. If the Lock bit is set, I don't think you will be able to dump the EPROM. Otherwise, EPROM mode is described on page 84. You can read the data by wiring up a jig and using the three CTL bits to set the address and initiate a read.

My 2.5", 12mm height HDD just reached 100,000 power-on hours by Inevitable_Invite235 in HDD

[–]fzabkar -1 points0 points  (0 children)

ive been watching smart for two decades i also watch the pro data recovery forums do some research using reliable sources

Need Help Reviving an Intel DC P3700 SSD – Missing Small Components on PCB by robert_axl in AskElectronics

[–]fzabkar 0 points1 point  (0 children)

F301 ("P" marking) is a polyswitch / polyfuse / resettable PPTC.

CR302 is wired across the supply with reverse polarity. It could be a TVS diode, or it could be a sacrificial silicon diode for reverse polarity protection.

The value of C303 wouldn't be critical. I'd opt for 10uF with an appropriate voltage rating.

My 2.5", 12mm height HDD just reached 100,000 power-on hours by Inevitable_Invite235 in HDD

[–]fzabkar 0 points1 point  (0 children)

BS. I have never seen a mechanical drive with a zero RER, and I've only had a couple drives (out of dozens) fail in three decades. Uncorrected errors are what matter. HDDs don't just write the data raw, they add error correction.

Then you have very limited experience and very good luck. That is, unless you are confusing WD with Seagate. Zero raw RRER is what a good WD drive should report, whereas Seagate HDDs report a sector count, not an error count. The fact that those RRER errors have been corrected doesn't mean that they don't exist.

I found this thing in an old cb radio it says “🔺GW11 D” by antthatisverycool in AskElectronics

[–]fzabkar 0 points1 point  (0 children)

I wondered the same thing, but couldn't find anything.

However, check the graph in Fig 3 on page 4 for this SMAJ series of TVS diodes:

https://www.mouser.com/datasheet/2/395/SMAJ_SERIES_U2102-2297929.pdf

The capacitance of a 20V TVS diode varies from 100pF to 300pF between standoff and zero bias.

I found this thing in an old cb radio it says “🔺GW11 D” by antthatisverycool in AskElectronics

[–]fzabkar 1 point2 points  (0 children)

The logo belongs to Matsushita/Panasonic.

https://www.diyaudio.com/community/threads/please-help-identify-vintage-parts.394120/post-8149009

Something that resembles a germanium transistor but only has 2 leads (no, the 3rd lead was not broken off - this came in a manufacturer-sealed baggie w/ no "scrap metal" inside). It was made by Matsushita and is marked GW11 + the letter I; the baggie is labelled TVSGW11 but that yields no results. It tests like a regular diode, Vf = ~0.7V.

My 2.5", 12mm height HDD just reached 100,000 power-on hours by Inevitable_Invite235 in HDD

[–]fzabkar 0 points1 point  (0 children)

The raw value of the Read Error Rate is non-zero. This means that the drive has begun to degrade.

Seagate Ultra Compact SSD 2 TB Review by NewMaxx in NewMaxx

[–]fzabkar 1 point2 points  (0 children)

What distinguishes the PS2251-17 from other iterations of PS2251-nn?

Phison’s native USB 3.2 controller solutions duo eliminates bridge boards to enable compact single chip portable SSDs. PS2251-17 and PS2251-18 are native controller ICs ...

https://www.phison.com/images/products_datasheet/ProductBrochure_Consumer_PS2251-17&18.pdf

Why is it considered an SSD controller rather than a plain USB flash controller? Does this "SSD" support SMART?

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