Windows 10 has very limited partitioning capabilities and will refuse to extend into a partition that is not immediately to the right of the partition, the best option would be to use a 3rd party utility like the free version of AOMEI Partition Assistant to Merge that unallocated space to another partition.
Answer. Go into UEFI/BIOS Setup and disable the secondary hard drive under Storage. Boot the media as a UEFI device as shown in my previous post, choose Custom Install, delete all partitions off the first drive to prepare it for the cleanest possible install. Then delete the EFI System partition (located by label) off the second drive.
Windows cannot operate for long on a Dynamic Disk, and most conversion methods require wiping the drive, so to convert non-destructively see Option 1 in this tutorial: Next, the Unallocated Space is empty space. You can use the same partitioning tool Partition Wizard to extend the data or C
Similar to extend volume in the Disk Management, you can use it to extend the current partitions with unallocated space, it has two options, namely, "Add unused space to all partitions" or "Manually adjust partition size". Just select one between them and then start clone, then it will automatically resize the partition size of target disk During the installation, delete the partitions whose space you wish to use for the installation. Once that space is converted into Unallocated, install Windows into this space. If you have deleted multiple non-contiguous partitions, use a third-party bootable partition editor to move the partitions on the disk so that the Unallocated space Open the Disk management window. Right click on the first unallocated partition and select the option to create a volume. Follow the on screen instruction to create a volume. After creating volume right click on that and select the option extend volume.
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