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Booting up with a thumb drive and imaging a new drive - The new drive is larger and it shows up as the old size.

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I just purchased this software and I created the bootable media on a thumb drive. Then I created a backup of my NVMe M.2 256GB hard drive to a USB Sata SSD. Then I powered down my laptop and installed a larger 500GB NVMe M.2 hard drive and booted the laptop up using the USB Thumb drive. Then I selected "Restore" and selected my source disk (256gb drive) and then select all the partitians, then I select the destination drive (500GB drive) and then proceed. When I boot up into Windows, everything look like its working however when I look at the properties of the C drive now it says it still a 256gb drive and that it has 200+ GB of unallowcated space. Has anyone seen this before? Thank you

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John, welcome to these public User Forums.

This can happen if either there are unmoveable partitions (by ATI) or the user chooses to restore the backup data 'as is' without automatic resizing.

The good news is that it is very easy to fix!  Please download a copy of the free MiniTool Partition Wizard software and use this to move any Windows Recovery partition that may follow after your main OS partition to the end of the unallocated space on the new drive.  After moving such partition(s) then resize your OS partition to use all the available unallocated space, or use that space to create a second 'Data' partition on the NVMe SSD.