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Very Strange . ST1000LM035-1RK172 H0 data same

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HddDonorMarket

Post subject: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 1st, 2021, 13:22

Joined: June 16th, 2018, 12:09
Posts: 489
Location: Usa

ST1000LM035-1RK172

Very strange. So much sector same Its occure when at slow reading speed
Sometimes its changing after reset .

Only Head 0 making this. And H0 , H1 both reading very good condition

Anyone meet this before?
what is your advices. Thanks

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HddDonorMarket

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 1st, 2021, 13:45

Joined: June 16th, 2018, 12:09
Posts: 489
Location: Usa

when refreshing sector. some sector changing. I guess that is real data

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jono-ats

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 1st, 2021, 15:28

Joined: June 8th, 2006, 19:44
Posts: 3144
Location: Atlanta, GA

The mo.L.D. sectors are not data -- they indicate a reading problem.

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pepe

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 1st, 2021, 17:07

Joined: October 3rd, 2005, 0:40
Posts: 4755
Location: Hungary

This pattern is generated by the fw and used for filling buffers, it may be used to fill MC sectors, i am not sure about this latter one.

so you get this instead of an UNC error.

pepe

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HddDonorMarket

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 1st, 2021, 17:24

Joined: June 16th, 2018, 12:09
Posts: 489
Location: Usa

I have backed up all sys except
Copy0 15E 181 182 183 184 . all others ok.

Drive sometimes reading full speed first parts of drive. When meet slows .
Sometime reading correct but slow also first parts of drive

Thanks @jono-ats. I have increased reading settings. It's reading some mo.L.D. sectors at first now. But not all

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HddDonorMarket

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 1st, 2021, 17:26

Joined: June 16th, 2018, 12:09
Posts: 489
Location: Usa

pepe wrote:

This pattern is generated by the fw and used for filling buffers, it may be used to fill MC sectors, i am not sure about this latter one.

so you get this instead of an UNC error.

pepe

It's behave as error would be. But no error. Then show that moDL.
What mean MC

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pclab

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 1st, 2021, 18:11

Joined: July 12th, 2010, 4:38
Posts: 1451
Location: Portugal

MC is Media Cache.

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HddDonorMarket

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 3rd, 2021, 16:50

Joined: June 16th, 2018, 12:09
Posts: 489
Location: Usa

deleted

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ddrecovery

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 3rd, 2021, 18:09

Joined: June 11th, 2013, 17:01
Posts: 1772
Location: Phoenix, AZ USA

The new version of PC-3000 allows you to show these bad bands when reading in DE as a different color. So you can recognize the issue quickly if it is affecting a drive. Also if you use C>U10 to recover the MC, you will undoubtedly have some of these bad bands.

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HddDonorMarket

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 3rd, 2021, 19:46

Joined: June 16th, 2018, 12:09
Posts: 489
Location: Usa

Now H1 also started same as H0
I guess its weak head problem for this model.

ddrecovery wrote:

Thanks. not solved.

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pepe

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 4th, 2021, 13:42

Joined: October 3rd, 2005, 0:40
Posts: 4755
Location: Hungary

U10 inits MCMT, practically clears any entries, so leads to data loss as well.

pepe

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ddrecovery

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 4th, 2021, 14:01

Joined: June 11th, 2013, 17:01
Posts: 1772
Location: Phoenix, AZ USA

pepe wrote:

U10 inits MCMT, practically clears any entries, so leads to data loss as well.
pepe

U10 recovers the MC with pretty much all data in tact.
U110 clears the MC.

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Masterclass

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 10th, 2021, 4:21

Joined: May 29th, 2011, 8:47
Posts: 141
Location: Russia

ddrecovery wrote:

U10 recovers the MC with pretty much all data in tact.

Very funny. Yes, U10 can recover MCMT.... just by erasing all entries :lol:

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Doomer

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 10th, 2021, 10:50

Joined: September 29th, 2005, 12:02
Posts: 3577
Location: Chicago

ddrecovery wrote:

U10 recovers the MC with pretty much all data in tact.
U110 clears the MC.

There is MC - Media Cache
And there is MCMT - Media Cache Management Table
MCMT describes LBAs that are stored in the MC
U10 erases MCMT but not MC, however since U10 erases all the pointers to MC, data from MC becomes unavailable (but not erased)

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ddrecovery

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 10th, 2021, 12:52

Joined: June 11th, 2013, 17:01
Posts: 1772
Location: Phoenix, AZ USA

Masterclass wrote:

ddrecovery wrote:

U10 recovers the MC with pretty much all data in tact.

Very funny. Yes, U10 can recover MCMT.... just by erasing all entries :lol:

Clearly I meant MCMT, I will remember to be as kind to you when you make one of your many errors ;-)

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ddrecovery

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 10th, 2021, 13:02

Joined: June 11th, 2013, 17:01
Posts: 1772
Location: Phoenix, AZ USA

Doomer wrote:

ddrecovery wrote:

U10 recovers the MC with pretty much all data in tact.
U110 clears the MC.

But using CU10 and re-writing 348 back to the drive, gives complete MC access does it not?

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Doomer

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 10th, 2021, 14:35

Joined: September 29th, 2005, 12:02
Posts: 3577
Location: Chicago

ddrecovery wrote:

But using CU10 and re-writing 348 back to the drive, gives complete MC access does it not?

yes, but only after you re-power the drive after writing the 348, and only if MC wasn't cleared by other means

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ddrecovery

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: June 10th, 2021, 14:38

Joined: June 11th, 2013, 17:01
Posts: 1772
Location: Phoenix, AZ USA

Doomer wrote:

ddrecovery wrote:

But using CU10 and re-writing 348 back to the drive, gives complete MC access does it not?

yes, but only after you re-power the drive after writing the 348, and only if MC wasn't cleared by other means

Agreed.

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Tawfeek

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: September 6th, 2021, 9:06

Joined: October 30th, 2007, 17:58
Posts: 464
Location: Egypt

Doomer wrote:

yes, but only after you re-power the drive after writing the 348, and only if MC wasn't cleared by other means

will change heads solve this issue about mo.L.D pattern ?

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HddDonorMarket

Post subject: Re: Very Strange . ST1000LM035-1RK172 H0 data same

Posted: September 6th, 2021, 14:31

Joined: June 16th, 2018, 12:09
Posts: 489
Location: Usa

Thanks. Case closed. No data recovered. I do not open this models. My assumption drive need swap head

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