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jdude45
 Post subject: Volume Serial Number Date/Time
PostPosted: January 19th, 2016, 9:57 
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Joined: July 19th, 2015, 10:05
Posts: 24
Location: Forida
I read that the volume serial number is a combination of the date and time that the volume was formatted. I have tried a number of sources to find out how to convert the VSN into the date and time, but I have not been able to find any information. The only tool that I can find is one which allows you to change the volume serial number. I tried a tool called "DCODE" but it doesn't work. Here is my volume serial number:

E210BAB019BAB004

Is there a way to convert this to date and time?

I know that when I used the "volume" command at the DOS prompt, it gave me a 32-bit number as the serial number. I used Active@DiskEditor and it gave me this larger number as the volume serial number.
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jermy
 Post subject: Re: Volume Serial Number Date/Time
PostPosted: January 19th, 2016, 10:33 
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Joined: March 19th, 2015, 15:01
Posts: 1366
Location: isreal
forget about 64 bit, the volume serial no. is designed in the 1950s
read chapter 28 here
note: if the date and time on the local computer was incorrect you will not able to get it right, i.e. you'll get the local date and time it was on the computer at the time of formating the drive
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jdude45
 Post subject: Re: Volume Serial Number Date/Time
PostPosted: January 19th, 2016, 11:57 
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Joined: July 19th, 2015, 10:05
Posts: 24
Location: Forida
Thank you for the reply. Here is what it said concerning the volume serial number:

To read the Volume Serial Number, use the IOCTL call, Int 21h function
440dh Minor Code 66h, Get Media ID. To write the Volume Serial Number,
use the IOCTL call, Int 21h function 440dh Minor Code 46h, Set Media ID.

I do not understand what this means. Could you explain what the author is saying here as far as reading the serial number? Thanks.
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einstein9
 Post subject: Re: Volume Serial Number Date/Time
PostPosted: January 19th, 2016, 12:21 
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Joined: May 13th, 2010, 11:17
Posts: 2296
Location: Kuwait
jdude45 wrote:
Thank you for the reply. Here is what it said concerning the volume serial number:

To read the Volume Serial Number, use the IOCTL call, Int 21h function
440dh Minor Code 66h, Get Media ID. To write the Volume Serial Number,
use the IOCTL call, Int 21h function 440dh Minor Code 46h, Set Media ID.

I do not understand what this means. Could you explain what the author is saying here as far as reading the serial number? Thanks.


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fzabkar
 Post subject: Re: Volume Serial Number Date/Time
PostPosted: January 19th, 2016, 13:08 
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Joined: September 8th, 2009, 18:21
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Location: Australia
The original DOS/Win9x boot record (FAT16/FAT32) had a 32-bit Volume Serial Number at offset 0x43.

An Examination of the MSWIN4.1 OS Boot Record:
http://thestarman.pcministry.com/asm/mbr/MSWIN41.htm

The NTFS boot record has a 32-bit Volume Serial Number at offset 0x48.

An Examination of the NTFS Volume Boot Record Of Microsoft Win 2000 and Win XP:
http://thestarman.pcministry.com/asm/mbr/NTFSBR.htm

Quote:
NOTE: When you use the DIR command and others inside of a CMD/DOS-box under Windows 2000/XP, it will show a Volume Serial Number composed of only the last four bytes of this Long Long Word [B4A4E199A4E15DFC]!

Example:

    C:\>dir
    Volume in drive C is Win2000
    Volume Serial Number is A4E1-5DFC

Obviously, we must look into this further to find out how all these bytes are being used by the Operating System!

It is interesting to note how the (3rd and 4th) and (6th and 7th) bytes repeat here!
Do you have a Serial Number where these two sets of bytes are not the same?

You can use a disc editor such as DMDE (freeware) to view and edit the boot sector.

http://dmde.com/

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