241A sectors

[Eastcoast Data Recovery]

Hi Guys, first post.

I seem to have on this 1TB Rosewood an issue that seems common, at least common enough for MRT to have developed a solution. 

 I don't have MRT but PC3K,  but the issue is exactly detailed here:

https://www.youtube.com/watch?v=5lKvzmVMBM4

The drive I have has bad heads.  I swapped out and was able to read H0 perfectly, but any attempt on H1  sectors returns with the characteristic mo.L.D 241A sectors

I thought my donor head was bad, but I got a perfect run on H0, so I swapped again and it's same result. 

On the MRT video they seem to be adjusting something called Step in the Rom by increasing the value from the default of 5, which I assume it's an adaptive change that eventually adjusts the head parameters to allow for reading, albeit at a slower speed.

There seems to be no easy way of doing the same on PC3K .  

I guess I could try to hack the rom module and search for the Hex for the stepping value, but wonder if anyone else has seen this or has a solution they wouldn't mind sharing or helping out on remotely.

Many thanks

Louis

[Eastcoast Data Recovery]

It would appear there is another earlier thread on this:

https://groups.google.com/g/datarecoverycertification/c/nA4wmHMw7DM/m/zhgmxuEXAQAJ

It seems ACE don't have or can't recommend the adjustment of AFH which I assume MRT is doing when with their Step change adjustment.

I'll try a couple more heads to see if it makes a difference.

Thanks

[Philip Shaw]

I think Acelabs is concerned about the destructiveness of such an adjustment. It seems like they could put the option out there with a big warning that using this could cause irreparable damage. That way, we could use it as a last resort.

Also, they should put in an option to identify the 241A sectors like MRT has. That would be an incredibly useful tool. Why haven't they done this yet?

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[Alandata Recovery]

I'm not in the lab, but in de in settings there is a hex field that I think is used to watch for matching sectors.

Never used it.

Don't know how.

But it's there.

My guess is that it may be used to auto shift away mold sectors....

Dunno....

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[wayne horner]

here is the setting

"detect invalid data"

looks like 

at byte 508 "sEDU"

and?

at byte 507 btTEC

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[Eastcoast Data Recovery]

Thanks all for your help.  The drive heads after changing to the third set allowed me to read H1 albeit slowly.  

Must have been picky heads all this time.

Louis

[juanvd...@gmail.com]

Did anybody tried to increase the head temperature for these cases because I have found to increase it to around 55`Celsius I get better read results on some drives.

 

Juan      

 

 

Louis Man
East Coast Data Recovery
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On Sun, Sep 3, 2023 at 10:29 PM wayne horner <waynea...@gmail.com> wrote:

here is the setting

"detect invalid data"

looks like 

at byte 508 "sEDU"

and?

at byte 507 btTEC

 

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[Eastcoast Data Recovery]

I might try that later.  I have a section of stubborn Yellow sectors that still come up as 241A.  I have already gotten off the target data so it's safe to try.  I will place it onto a heating mat and try those sectors again.

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[Eastcoast Data Recovery]

No improvement on those "moldy" sectors even by heating the hdd.  Calling it a day on this case.  We managed to recover the target data so time to move on.

Thanks

[Computer Shopee]

Hi Sir,

can you please Tell me "how to increase the Head Temperature". 

Today i working with a Rosewood Head0,1,3 are very good.

 i Image the Drive & starting the Image with Head 2 "Do Not use Hardware Retries" 

490Kb Going Terminal Going with Error Images.

is Theire ant chances to inverse the Speed.

Thank you

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[Louis Man]

Nothing exotic, I just used a heating mat used for phone repair .  

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[t...@desertdatarecovery.com]

Are those sectors you’re reading ‘real’ data?

 

Tim Homer - Lead Engineer

Desert Data Recovery

t...@desertdatarecovery.com

www.desertdatarecovery.com

 

From: datarecovery...@googlegroups.com <datarecovery...@googlegroups.com> On Behalf Of Louis Man
Sent: Wednesday, September 6, 2023 7:07 AM
To: datarecovery...@googlegroups.com
Subject: Re: 241A sectors

 

Nothing exotic, I just used a heating mat used for phone repair .  

 

On Wed, Sep 6, 2023, 14:35 Computer Shopee <computershope...@gmail.com> wrote:

Hi Sir,

 

can you please Tell me "how to increase the Head Temperature". 

Today i working with a Rosewood Head0,1,3 are very good.

 i Image the Drive & starting the Image with Head 2 "Do Not use Hardware Retries" 

490Kb Going Terminal Going with Error Images.

 

Alandata Data Recovery -  (949)287-3282  

www.AlanData.com   www.AlanDataRecovery.com

 

To view this discussion on the web visit https://groups.google.com/d/msgid/datarecoverycertification/CAOZ%2B%2BhADXJXd9kMPqdeyPa%2BeOT-U%3DvmE8mxS2c6i8SWhSDcb8A%40mail.gmail.com.

[juanvd...@gmail.com]

For this I use the DFL tools they have the option to monitor head temp while cloning and you can set the head temp in the app but I believe that control the head gap related to the platter surface. Between 50 and 60 works for me on some cases.

 

 

From: datarecovery...@googlegroups.com <datarecovery...@googlegroups.com> On Behalf Of Louis Man
Sent: Wednesday, September 6, 2023 4:07 PM
To: datarecovery...@googlegroups.com
Subject: Re: 241A sectors

 

Nothing exotic, I just used a heating mat used for phone repair .  

 

On Wed, Sep 6, 2023, 14:35 Computer Shopee <computershope...@gmail.com> wrote:

Hi Sir,

 

can you please Tell me "how to increase the Head Temperature". 

Today i working with a Rosewood Head0,1,3 are very good.

 i Image the Drive & starting the Image with Head 2 "Do Not use Hardware Retries" 

490Kb Going Terminal Going with Error Images.

 

Alandata Data Recovery -  (949)287-3282  

www.AlanData.com   www.AlanDataRecovery.com

 

To view this discussion on the web visit https://groups.google.com/d/msgid/datarecoverycertification/CAOZ%2B%2BhADXJXd9kMPqdeyPa%2BeOT-U%3DvmE8mxS2c6i8SWhSDcb8A%40mail.gmail.com.

[Computer Shopee]

Actually I tried after some imaged,  

But Files Not opening its in Exfat..

Index Not Building To check the Data..

So, I want to Complete & check in RST

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[Fraser Corrance]

You can adjust the AFH values with the PC3000 using terminal commands. In this tutorial he is using ZOC but you can also enter the commands for each zone manually but it's a bit of a PITA.  

https://www.youtube.com/watch?v=W9KbKw57GxI&t=118s

[Mike - USBRecovery.co.uk]

Do I remember Jarad having a spreadsheet for download to generate the commands or am I imagining it? I can't see to find it with a quick google.

[juanvd...@gmail.com]

Last month I received a 1TB with two heads and both heads read perfect 120meg/s till about 60% in the drive then both heads MOLD reads until the last sector.

I did not swap heads yet because all data areas are successful, but this cant be a head issue then ?

I also played around with the head hight adjustments up and down but nothing.

 

From: 'Eastcoast Data Recovery' via DataRecoveryCertification <datarecovery...@googlegroups.com>
Sent: Tuesday, September 5, 2023 1:49 PM
To: DataRecoveryCertification <datarecovery...@googlegroups.com>
Subject: Re: 241A sectors

 

Just an update on this.

I've tried my third set of heads and now got good sectors but notice I still sometimes get the invalid MOLD 241A sectors unless I read slowly. 

 

 Currently reading 8sectors in PIO which seems to be steady at 1.5MB/s

 

I hope the above is useful to someone else.

 

 

On Sunday, September 3, 2023 at 10:29:18 PM UTC+1 waynehorner wrote:

here is the setting

"detect invalid data"

looks like 

at byte 508 "sEDU"

and?

at byte 507 btTEC

 

To view this discussion on the web visit https://groups.google.com/d/msgid/datarecoverycertification/dddfe2e3-d9cc-4b25-ba1f-d0c1f44afb34n%40googlegroups.com.