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JammerOne
 Post subject: checksum?
PostPosted: April 25th, 2015, 23:18 
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Hello there ,

Im a newbie .. Sorry for my question. Experiment..

I try to read the ROM chip 8 pins of both hard drive S93C76 in the Hitachi Hard drive ..

Hitachi model HDP725032GLA380 and try to edit serial number on hex .. but after I write back on my hard drive
Hard drive wont start .. is there any checksum needed?

Even I edit 1 Character on the Serial the Drive wont start .. but if I write back the Dump the unit will work again ..

Regards,
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fzabkar
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 0:38 
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Yes, there is a checksum.

I suggest you do this:

    Read ROM and NVRAM
    Enable PUIS (Power Up In Standby) using HDAT2, hdparm, Hitachi Feature Tool, etc
    Read ROM and NVRAM again
    Disable PUIS
    Compare the before-and-after copies of ROM and NVRAM

If you upload both sets of data, I'll help you find the checksum and recalculate it. That said, I suspect that the drive will spin up, but will probably not give you access to your data due to a ROM/SA serial number mismatch. But that's only a guess.

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JammerOne
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 2:45 
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Location: Philippines
fzabkar wrote:
Yes, there is a checksum.

I suggest you do this:

    Read ROM and NVRAM
    Enable PUIS (Power Up In Standby) using HDAT2, hdparm, Hitachi Feature Tool, etc
    Read ROM and NVRAM again
    Disable PUIS
    Compare the before-and-after copies of ROM and NVRAM

If you upload both sets of data, I'll help you find the checksum and recalculate it. That said, I suspect that the drive will spin up, but will probably not give you access to your data due to a ROM/SA serial number mismatch. But that's only a guess.


Hello there ...

Here is the files ..

Thanks for assisting me ...

Regards,


Attachments:
File comment: here is the files
Slave Harddisk S93c76 16bit.rar [1.92 KiB]
Downloaded 496 times
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fzabkar
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 3:41 
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Quote:
I suggest you do this:

    Read ROM and NVRAM
    Enable PUIS (Power Up In Standby) using HDAT2, hdparm, Hitachi Feature Tool, etc
    Read ROM and NVRAM again
    Disable PUIS
    Compare the before-and-after copies of ROM and NVRAM

If you upload both sets of data, I'll help you find the checksum and recalculate it. That said, I suspect that the drive will spin up, but will probably not give you access to your data due to a ROM/SA serial number mismatch. But that's only a guess.

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JammerOne
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 7:41 
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Joined: March 15th, 2015, 8:44
Posts: 43
Location: Philippines
The problem is I only see 1 chips. aside the 2 bigs IC.

the other is blank ...
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JammerOne
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 12:59 
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Very Informative sir spildit ..

which one is more easy to manipulate of these drives?

Hitachi / Samsung / Toshiba

cause they only accept the Hard Drive of these 3.
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JammerOne
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 13:15 
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Location: Philippines
Hi,

When I check in the SETUP Menu of this Device .. HDD Serial Displayed 32 HEX..

My Working Unit is ...

" 80BB2F490D51AE87908F4E5237CEE643 "

when I try to change the Hard Drive and this will change ..

I dont know where the Device get this ..

Thanks ..
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fzabkar
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 13:28 
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JammerOne wrote:
The problem is I only see 1 chips. aside the 2 bigs IC.

the other is blank ...

Just read the NVRAM then.

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fzabkar
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 13:30 
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JammerOne wrote:
Very Informative sir spildit ..

which one is more easy to manipulate of these drives?

Hitachi / Samsung / Toshiba

cause they only accept the Hard Drive of these 3.

As Spildit has said, you can make a WD drive look like other drives using HDDHackr or other tools.

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fzabkar
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 13:59 
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Spildit wrote:
Do you know the ATA command to set PUIS on and PUIS off ? (Register status to do it) ?

    Set Features EFh/06h - Enable the PUIS feature set
    Set Features EFh/86h - Disable the PUIS feature set
    Set Features EFh/07h - PUIS feature set device spin-up

The Subcommand Code is placed in the Feature register. In MHDD you would use a line like ...

    regs$ = 06 00 00 00 00 00 ef

There are two ways to spin up a device that has powered up in standby. One is to send any read or write command. The other is to send the Set Features EFh/07h command. Bit 6 of words 83 and 86 of the Identify Device data block determine whether the drive requires the EFh/07h command.

If using HDAT2, just launch it with the /w modifier to wake up the drive, ie ...

    HDAT2 /w

Spildit wrote:
Apart from PUIS what do you think it's stored on the NVRam that I could change on the drive config to the NVRam change as well ? What sort of configuration (that can be set on the drive by ATA) is stored on the NVRam ?

I can't think of any ATA setting, but if your tool allows you to change the serial number, then we could use it to better understand the NVRAM structure.

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guru
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 14:16 
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Joined: May 5th, 2004, 20:06
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Why do you want to change serial? Want to crack software? Want to cheat on warranty claim?

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JammerOne
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 14:23 
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guru wrote:
Why do you want to change serial? Want to crack software? Want to cheat on warranty claim?


No sir ...

Just use for the Repairing Media Device . that without support from the seller ...

to save neighborhood media device ..

Thanks


Last edited by JammerOne on April 26th, 2015, 14:26, edited 1 time in total.

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JammerOne
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 14:36 
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Location: Philippines
Spildit wrote:
guru wrote:
Why do you want to change serial? Want to crack software? Want to cheat on warranty claim?


I've just changed my serial :)

The Serial is stored after the IDNT module on the firmware but there is no pointer to it on the USAG list.

I've changed my drive serial by appending "SPILDIT" at the end, and it works just fine. This is independent from NVRAM and the drive works with the new serial even if the NVRAM is still the same (it's not changed).

Image

Image


What tools you are using ?
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guru
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 15:09 
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Deleted

JammerOne wrote:
guru wrote:
Why do you want to change serial? Want to crack software? Want to cheat on warranty claim?


No sir ...

Just use for the Repairing Media Device . that without support from the seller ...

to save neighborhood media device ..

Thanks

_________________
All went well until I plugged the drive in.


Last edited by guru on April 26th, 2015, 15:10, edited 1 time in total.

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guru
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 15:09 
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What media device is it?

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fzabkar
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 15:50 
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On closer inspection, the number in NVRAM is not the serial number that is reported by the drive. Furthermore it appears that, at least in some Hitachi/IBM models, the PUIS flag may be stored in "ROM" rather than "NVRAM".

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JammerOne
 Post subject: Re: checksum?
PostPosted: April 26th, 2015, 20:53 
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Joined: March 15th, 2015, 8:44
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Location: Philippines
guru wrote:
What media device is it?


Hello sir ..

It is Easy Sing Mk8504 Sing along Video Karaoke HDD System..

Thanks
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guru
 Post subject: Re: checksum?
PostPosted: April 27th, 2015, 5:25 
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Have you tried contacting www.multak.com ?
JammerOne wrote:
guru wrote:
Why do you want to change serial? Want to crack software? Want to cheat on warranty claim?


No sir ...

Just use for the Repairing Media Device . that without support from the seller ...

to save neighborhood media device ..

Thanks

_________________
All went well until I plugged the drive in.
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JammerOne
 Post subject: Re: checksum?
PostPosted: April 27th, 2015, 21:45 
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Joined: March 15th, 2015, 8:44
Posts: 43
Location: Philippines
guru wrote:
Have you tried contacting http://www.multak.com ?
JammerOne wrote:
guru wrote:
Why do you want to change serial? Want to crack software? Want to cheat on warranty claim?


No sir ...

Just use for the Repairing Media Device . that without support from the seller ...

to save neighborhood media device ..

Thanks


Yes sir.

But they tell me to buy their New Product .. (They introduce new Product and Marketing Strategy)

The old are all working aside the Hard Drive Defect ... after we replace Hard Drive and all be fine,,,

Thanks ..
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fzabkar
 Post subject: Re: checksum?
PostPosted: April 27th, 2015, 22:15 
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Location: Australia
Why would a manufacturer of a Karaoke machine want to "protect" the HDD, except to prevent a user from purchasing his own "optional" accessories?

http://www.a4u.ca/ifun/MK8504%20Highlight.htm

JammerOne wrote:
But they tell me to buy their New Product .. (They introduce new Product and Marketing Strategy)

The old are all working aside the Hard Drive Defect ... after we replace Hard Drive and all be fine,,,

Seems like planned obsolescence to me. Kudos for trying to keep working equipment out of the landfill.

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