It is created to reserve a portion of the disk space for possible subsequent usage by the Windows Operating System. The MSR partition on my machine is 128MB. Reflect will show this partition as do some disk partitioning tools. Step 2: clone drive Step 3: restore the cloned image to the new drive. There is nothing wrong with having to re-enable it after restoring the clone. This is highly recommend if you ever want to get access to the drive. Most likely what you're missing in Disk Management is the MSR Reserved partition which is purposely hidden. Heed the advice of the software, you must disable BitLocker before cloning. I'm also wondering about the recovery partitions (partitions 4 and 5). There are only four partitions shown in Disk Management but there are five shown in Reflect. My question now is why is there a difference between the way Macrium Reflect displays the partitions versus Windows Disk Management. I followed the procedure in this video and was able to boot from my new 1TB drive. Then I found a video that explained how to get your system partition to align properly (UPDATE: Using Macrium Reflect Free to Clone Windows to a Bootable M.2 SSD). After installing the cloned drive, my computer would go directly to the BIOS setup utility.

I followed instructions for resizing the C drive given in a Macrium tutorial video (Cloning a disk using Macrium Reflect 7) available on Youtube. I had been running two 250GB SSDs in RAID 0 and I was running out of space.

Macrium reflect clone to smaller drive