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Restoring extended partition in Win 10

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I have a 3TB Seagate drive installed in my (then) Windows XP PC split 2/0.7 GB, installed W10 and lost the extended partition - how can I read/recover the extended partiton?

I used Acronis True Image 2013 software to partition the drive into a 2TB portion and a second extended drive of about 700 GB. I used True Image to back up the computer onto the main partition in file mode, and copied critical files to the extended partition.

I then proceeded to install Windows 10 update to the PC.  Updating my Windows 7 to Win 10 went smoothly. Not so well with the XP computer.

The first problem was that when I had installed Win 10, the extended partition disappeared. The drive appears as a 2TB drive, with the remaining 700 GB hidden.  How can I recover the important files from the hidden extended portion of this drive?  How can I then make the 3TB drive use its full capacity?  Do I have to format it, having copied data elsewhere?

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I have an old computer that I needed to install windows and recover from Acronis 2011.  But now that I have done the whole thing I cannot recover from my backup. it keeps saying that "Failed to deploy task"  There is a very long event code starting with 0x00640025+....  How can I recover my system?

Henry, the issue that you have reported is under investigation. Please see private message that I have sent you for more details.

Manijeh, if you have a question/issue that is unrelated to the current topic, please start a new discussion. In your particular situation the quickest way to recover from your backup would be to boot your computer from Acronis bootable media and launch restoration from there. See https://kb.acronis.com/getmedia on how to get it if you have not burnt bootable media yet and it is not possible to create it from within program interface for you for any reason.