I would recommend using Disk Management to remove that G: assignment, which should persist across reboots. On that same disk, I'm also curious what Partition 3 is doing.

Judging by the space actually in use, it seems like it might be a Windows Recovery partition, but 26 GB is an awfully large partition for that purpose. That's a size I'd expect to see for a 'factory image restore' partition, but then much more of it would be in use. The Windows Recovery partition is also typically either at the beginning of the disk containing your C partition or just after your C partition. You have a partition in the latter location that seems to be the right size and to have a plausible amount of space consumed, but Reflect isn't showing a Windows logo on that partition (or the 26 GB partition), which it does for properly configured Windows Recovery partitions. That partition might have WinRE files but not be properly 'registered' as a Recovery partition. Select the disk containing your C partition, click 'Clone this disk', and select your target disk as the destination.Boot into your Rescue Media environment, ideally from an external disc or flash drive, NOT the recovery boot menu option.Make an image backup of the disks involved before proceeding.Would backing up the contents of your H partition somewhere else, wiping it out during a clone, and then copying data back to a new partition be an option? If so, I would recommend the following: But if you're a frequent Reflect user, you might never need it anyway.

Select the H partition and click 'Delete existing partition', then repeat that for the 26 GB partition so that your destination now only has your System Reserved partition followed by empty space.

Drag your C partition down to the destination disk just after your System Reserved partition.

Macrium reflect system recovery