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RE: Cloning with Samsung data migration missed a partition?

Apart from the recovery partition of Windows, there may be another recovery partition created by the computer manufacturer like Lenovo and Dell that has made their computer come with an OEM recovery partition consuming about 7 to 20 GB, which contains the WinRE and their factory installation files. This OEM partition allows you to press a specified key to boot into Recovery Environment, so you can recover your OS to factory setting without a Windows installation disc. If you have a copy of Windows installation, you can delete this OEM partition to free up more disk space. This guide has a more detailed explanation about it, you can please have a look.

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