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Drive Encryption ignores partition with GPT attributes set

If you set GPT attribute 0x8000000000000000 on a partition (https://docs.microsoft.com/en-us/windows/desktop/api/winioctl/ns-winioctl-_partition_information_gpt), Drive Encryption ignores the partition, even if you still have a drive letter assigned to it.

Windows sets this attribute automatically, if you remove the drive letter from a partition. When you do this from a second Windows installation (dual boot), the attribute gets assigned, but the first Windows installation still keeps the drive letters.

My encryption policy is set to encrypt only specific partitions and I found, that partitions with this attribute set, will be automatically decrypted.

The GPT cannot be encrypted, so it is possible to set this attribute by attaching the disk to another pc. If you plug it back, the encrypted pc still works fine, but Drive Encryption starts silently decrypting the partition. This is not shown in the status window or ePO server.

I cannot think of this as intended behavior. What are your thoughts?

 

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Re: Drive Encryption ignores partition with GPT attributes set

Hello,

I think this is intended behavior due to compatibility issues because currently MDE 7.x does support GPT as a boot or secondary disk only for UEFI systems while for BIOS GPT can be used only for secondary disk:

https://kb.mcafee.com/corporate/index?page=content&id=KB75750

https://kb.mcafee.com/corporate/index?page=content&id=KB79784

In case above information was useful or answered your question, please select "Accept as Solution" in my reply, or give a Kudo. Thanks!
Nino
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Re: Drive Encryption ignores partition with GPT attributes set

The system uses Windows 10 with UEFI and a GPT boot disk. No other drives are installed. This configuration should be supported.

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Re: Drive Encryption ignores partition with GPT attributes set

Hello,

it is the way MDE works since dual boot is not supported:

Supported operating systems for DE point 1

In case above information was useful or answered your question, please select "Accept as Solution" in my reply, or give a Kudo. Thanks!
Nino
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