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Nick_CT
 Post subject: DCM on new WD's - gone?
PostPosted: January 12th, 2017, 5:43 
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Joined: September 5th, 2010, 12:29
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Location: South Africa
So I'm booking in a new 2.5" 3TB WD into stock from a job that I just completed, looked for the DCM....... it doesn't have one.

WD30NMVW-11C3NS4

It has DCX but I've never bothered noting or recording DCX info.

Am I going crazy, not looking properly or is there no longer DCM listed on these drives?

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Blizzard
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 12th, 2017, 10:47 
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Joined: October 21st, 2014, 1:39
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The only WD30NMVW I have seen has a thin "C" shaped label and no DCM.
The WD20NMVW has a bigger label and does have the DCM on it.

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pcimage
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 12th, 2017, 11:16 
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Joined: November 29th, 2006, 10:08
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Location: UK
No DCM's on my 3Tb's

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fzabkar
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 23rd, 2017, 3:13 
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Just in case you weren't aware, there is a DCM in module 02 and in module 0A. The DCX appears to be related to the family code.

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Martin
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 24th, 2017, 7:13 
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Yep, you have DCM on SA.
There is another question - is it useful for you?

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Nick_CT
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 24th, 2017, 10:48 
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Martin wrote:
Yep, you have DCM on SA.
There is another question - is it useful for you?


For donor matching with certain families, yes it is.

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Martin
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 24th, 2017, 11:49 
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Nick_CT wrote:
Martin wrote:
Yep, you have DCM on SA.
There is another question - is it useful for you?


For donor matching with certain families, yes it is.


There is no sensitive info for matching heads, only common information.

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Nick_CT
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 24th, 2017, 12:01 
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Martin wrote:
Nick_CT wrote:
Martin wrote:
Yep, you have DCM on SA.
There is another question - is it useful for you?


For donor matching with certain families, yes it is.


There is no sensitive info for matching heads, only common information.


Well it works for me and a good few other pros whose knowledge I respect, so each to his own.

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jermy
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 24th, 2017, 18:33 
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Joined: March 19th, 2015, 15:01
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Martin wrote:
Yep, you have DCM on SA.

If someone is looking for a donor with bad heads who doesn't have to access SA, a copy of the DCM in SA will not help
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fzabkar
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 24th, 2017, 19:00 
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This is what I extracted from the HDD Guru files area:

    WD30NMVW-11C3NS2

    S|BWL|PMMJH5C2REVMKCUB - mod 02 (SA)
    |W|MJ52EMF - mod 0A (ROM)

Code:
DCM = | W | M J 5 2 E M F
      : : : : : : : : : :
      : : : : : : : : : unknown
      : : : : : : : : top VCM
      : : : : : : : ACA
      : : : : : : bottom VCM
      : : : : : HSA
      : : : : media
      : : : preamp
      : : latch
      : base
      spindle motor

If your ROM tool doesn't provide this information, then you might like to try mine:

http://www.users.on.net/~fzabkar/temp/wdromv11.exe
http://www.users.on.net/~fzabkar/temp/wdromv11.bas

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Tomset
 Post subject: Re: DCM on new WD's - gone?
PostPosted: January 24th, 2017, 19:40 
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Joined: September 29th, 2005, 4:10
Posts: 402
Location: Moscow
fzabkar,
DCM code practically does not affect similar across the heads.
Only a little more likely.
Аlready 8 years old do not look DCM.

Specifies compatibility only the totality of the heads of adaptive parameters.
No external signs which do not guarantee that the head will fit.
Only slightly increase the likelihood.
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