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Windows 7: disk offline due to signature collision

21 Aug 2016   #1
giwatcher

win7 ultimate 32 bit
 
 
disk offline due to signature collision

I cloned my existing hd to a larger size in case the first drive failed. Both drives work when installed alone. When either is used as a secondary external , attachment by usb, the ext is not recognized and gives the signature conflict in disk management. disk part shows they have identical signatures and if I change the id or right click to change offline to online, the disk will be read as a secondary drive. But, the new sig makes it unbootable as a primary drive, defeating the purpose of creating the clone. My question is, if the sig has been changed so that the drive is not bootable, and I no longer have the first drive to see what the sig should be, is there a program that will find and correct the sig to make the drive bootable again? Is it possible to do a system repair or boot repair from a win 7 disk to fix this?


My System SpecsSystem Spec
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21 Aug 2016   #2
ICIT2LOL

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10
 
 

First up giwatcher great idea to clone - something I always do with my machines especially if you want to play with another OS - for example upgrade to 10 - use the clone - if it fails then the original goes back in.

Now I am also guessing here that this might be depending on the drive you are setting as the first boot option in the BIOS and even so I would be real wary of using the clone as an external hooked up afterwards in any case - in case it corrupts the system entirely. Myself and I could be totally wrong that because the clone has a bootable property and I am wondering why you need to have two bootable drives in at the same time.

Would it not be an idea to just get a new external to use?
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21 Aug 2016   #3
samuria

win 8 32 bit
 
 

When you install a disk Windows edited a signature to the drive do it knows what it is as you cloned you need to use disk part go change one signature
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21 Aug 2016   #4
giwatcher

win7 ultimate 32 bit
 
 

Thanks for the reply. Not trying to use 2 bootables on the same machine, but thought I could use the clone as backup storage or to transfer files, only to find out that I can't unless I change the signature of the drive, and then it is no longer bootable. Many google threads recommend right click<select online, which works, but makes the drive no longer bootable. I am trying to find out if the newly non-bootable drive with a changed signature can be repaired if I don't know the original sig for whatever reason.
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21 Aug 2016   #5
samuria

win 8 32 bit
 
 

How did you change signatures with disk part?
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21 Aug 2016   #6
giwatcher

win7 ultimate 32 bit
 
 

I did not change the signatures yet. I realized if I did so that the disk won't be bootable. Again, I am only fact finding and asking that , if I did change the signatures, like many people have by right click>online in disk mgt, and did not know the correct signature to change it back, will a disk repair or other software repair this issue?
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21 Aug 2016   #7
samuria

win 8 32 bit
 
 

The signature is just that a signature so it know what the drive is nothing to do with booting or diskmanagement

How to Change the Disk Signature of a Drive Without Losing Existing Data or Reformatting (howtohaven.com)
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22 Aug 2016   #8
jumanji

Windows 7 Home Premium 32 bit
 
 

Quote   Quote: Originally Posted by giwatcher View Post
I did not change the signatures yet. I realized if I did so that the disk won't be bootable. Again, I am only fact finding and asking that , if I did change the signatures, like many people have by right click>online in disk mgt, and did not know the correct signature to change it back, will a disk repair or other software repair this issue?
I really do not know why you are saying that you can't find the unique ids of both the disks you have and that have the same unique id.

Look at the last screenshot in my post #57. How to recover ntfs partition

There disk 1 and disk 2 have the same unique id.

Can you not note it down and keep it? ( Or better take a screenshot as shown and keep it on a third drive )

In your case assuming that your bootdisk (say Disk 0) and the other one which you are connecting as external (say Disk 1) will have the same unique id. Note it down or screenshot.( actually not necessary)

You will now be changing the unique id of Disk 1 , to avoid the signature collision.( Use disk part command only to change it. The last line in the screenshot shows how to change the Unique Id of the selected Disk.Just change one letter ( A to F)/number( 0 to 9) in any one field as shown in my screenshot.)

If you now want to make it the boot drive, just change the unique ID back to the original unique ID which in any case you will seeing as the unique ID of your boot Disk 0.
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22 Aug 2016   #9
giwatcher

win7 ultimate 32 bit
 
 

Thank you jumanji and samuria for your replies. You both have misunderstood my question. I know the disk1 clone will not boot if I change its signature and don't know to use disk part write down the original signature before I change it. This has happened to those with the disk offline message in disk management who were instructed to right click>online to get access to disk1. They were not told to use disk part to write down the sig, so if they then tried to use disk1 as a bootable disk0, they would no longer have a bootable disk.
My disk1 is a clone of disk0 with the same sig id. If I mounted disk1 and made it online as a secondary disk, and I know nothing of signatures, and if then disk0 has a major malfunction and self destructs, I might say, no problem, I have the clone to use as a bootable disk, as if nothing ever happened. But, guess what- it won't boot because I unknowingly changed its sig.
In that situation, is all hope lost fixing the clone to boot, or can the sig be repaired by loading the win7 repair disk, or by some software that is out there that fixes disk signatures?
Hopefully, I have stated my question clearly this time.
My System SpecsSystem Spec
22 Aug 2016   #10
jumanji

Windows 7 Home Premium 32 bit
 
 

Yours is a hyphothetical question. Why? If you had a signature collision you would change the unique ID of only one drive. Why should you change the unique ids of both the drives?

Anyway to answer your hyphothetical question:

If I don't know what the original unique ID of the two drives that had a signature collision and I had changed the unique ids of both those drives to some random unique ids ( I should be a maverick to do that), then as far as I know there is no way you can get the original Unique id. I would be learning something new if one finds that unique id .
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 disk offline due to signature collision




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