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Unknown Partition when creating master image

Beginner
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Comments: 2

We recently just started using the newest model of Probook from HP (HP Probook 640 G3) and I've been having issues creating a master image using windows 10 with these machines.

Out of the box everything seems fine if I want to create a master image, but as soon as I make any changes the C: drive starts showing up as Unknown with a type of "FS:'Unknown' Partition" and I have not been able to create a usable image because of this.

I ran chkdsk /f /r on the drive and it came back clean.  Any ideas/suggestions?

Forum Hero
Posts: 36
Comments: 6180

What version of SD are you using?  1749 was released in August with support for Windows 10 and Server 2016.

What types of changes are you making and where, that causes issues (configuration of the task in the SD5 console, changes during the deployment, changes to the drive after the image is deployed)?   A change to the bios settings?

Need a little more info to help make an educated guess.  I'd also recommend contacting Acronis technical support to open a case with them in case there is a deployment issue/bug.  

Beginner
Posts: 0
Comments: 1

I'm having the same thing come up with brand new Dell lat's 5480.

Trying to make a master, and the C-Drive is "Unknown", file system also says "unknown".

The only thing I've done is install our company software. I haven't made any changes to the BIOS.

Snap deploy says it can continue, but only if I let it to a sector by sector image.

 

Which I am trying now.

Beginner
Posts: 2
Comments: 2

"What types of changes are you making and where, that causes issues (configuration of the task in the SD5 console, changes during the deployment, changes to the drive after the image is deployed)?   A change to the bios settings?"

The issue occurs when any change is made to the original OS.  Out of the box if I image the laptop with its factory settings the machine shows up fine.  If I take the machine and uninstall any software (usually we uninstall default HP software) and then install our company software on it (simple stuff like Microsoft office and checkpoint VPN) then the drive starts showing up as the unknown partition.

 

"I'm having the same thing come up with brand new Dell lat's 5480.

Trying to make a master, and the C-Drive is "Unknown", file system also says "unknown".

The only thing I've done is install our company software. I haven't made any changes to the BIOS.

Snap deploy says it can continue, but only if I let it to a sector by sector image.

 

Which I am trying now."

 

Sounds exactly the same, we are only making simple changes, nothing to bios or serious system changes.

I have tried the sector by sector and had no luck, so I will be interested if you have any luck.

Beginner
Posts: 2
Comments: 2

As an update, after working with the same image for a while now I was able to run a chkdsk and now have the file type showing as "none" as opposed to "unknown."  

 

Not sure if that helps any.

Forum Moderator
Posts: 95
Comments: 3583

Hello Dan,

I'd suggest checking the system for errors before image creation, then creating a master image with the help of an Acronis bootable media instead of an Agent installed onto the master machine, see Offline imaging. Validate the new image after creation. This will probably help to workaround the issue, but to know the exact cause and cure you'd need to raise a support ticket, so that our engineers can proceed with the investigation. 

In reply to by Graham Llewellyn

Beginner
Posts: 0
Comments: 1

the problem may be that the drive is encrypted with bitlocker from the factory. run the following powershell command as administrator:

Disable-Bitlocker -MountPoint "C:"

wait for the drive to unencrypt... use this command to check progress

Get-BitlockerVolume

 

Beginner
Posts: 0
Comments: 2

I'm having the same issue trying to creating a master image from a Lenovo Thinkpad T470s computer running Windows 10 version 1709. I am using standalone Acronis Snap Deploy 5 version 1749 bootable media but when I launch the master image creator the main Windows OS Partition is listed as "Unknown" and the Type is listed as "FS: 'Unknown' Partition: 0x0 (Unused)". Snap Deploy allows me to continue, but gives the warning "Some volumes contain errors and can be imaged only sector-by-sector." If I try to deploy the newly created master image to the same hardware using the same bootable media I receive the error "Deployment has completed with errors" and the deployment fails.

I also tried using standalone Acronis Snap Deploy 5 version 1755 bootable media but when I launch the master image creator the main Windows OS Partition is listed as "None" and the Type is listed as "None". Snap Deploy allows me to continue without warning and create the master image, but if I try to deploy the newly created master image to the same hardware using the same version 1755 bootable media I receive the same error "Deployment has completed with errors" and the deployment fails.

I have also replicated this issue with Dell Latitude 7480 hardware. I have tried changing SATA configuration from AHCI, disabling secure boot, and launching Snap Deploy media using Legacy boot instead of UEFI, but the main Windows OS partition remains listed as "Unknown" or "None". I can confirm that the same laptops running Windows 10 version 1703 do not have this issue when creating a master image, so there appears to be a compatibility issue with Windows 10 version 1709 (Fall Creators Update) and Snap Deploy 5 master image creator.

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Beginner
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Update: I was able to resolve this issue by turning off Device Encryption:

Windows 10 version 1709 (Fall Creators Update)
     Start > Settings > Update & Security > Device Encryption > Turn Off

Windows 10 version 1703
     Start > Settings > System > About > Device Encryption > Turn Off

Device Encryption is a new Windows 10 feature that is different from BitLocker and automatically turns itself on if your computer meets certain hardware requirements as outlined in this article - https://docs.microsoft.com/en-us/windows-hardware/design/device-experiences/device-encryption-for-oem. As soon as the device decryption process completed I was able to create a master image without issue and the main Windows OS partition was correctly recognized as NTFS instead of "Unknown" or "None".

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Forum Member
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Comments: 36

Thanks for doing all the leg work on this and providing updates, FivePrime!

 

This is an interesting find and I will have to see if disabling this feature will help with our intermittent issues.

In reply to by FivePrime IT

Beginner
Posts: 0
Comments: 1

FivePrime, thanks for finding this information out and sharing it.

Have you found where the Device Encryption settings are in Version 1803?

I've looked everywhere I can think of and even searched for the term "Device Encryption" in the Settings home page, but I'm not having any luck finding it.

In reply to by Curtis Trousdale

Beginner
Posts: 0
Comments: 1

Curtis,

It is in the same place as 1709: Settings > Update & Security > Device encryption 

 

Thanks for FivePrime for finding this, was wondering why the partition was saying unknown and my images were coming out to be 60GBs.