Migrate a primary hard drive to a larger one

A simple disk image results in the extra space of the larger HD unallocated. A new partition could be created to use the unallocated space, but the crammed primary partition can be a severe bottleneck of the computer performance. Windows Disk Management (Computer Management > Storage) can extend a partition to use unallocated space.  However, the unallocated space can be added only to its adjacent partition.  The Windows’ System Reserved partition may be between the primary partition and the unallocated space making it impossible to extend the primary partition to use the unallocated space.

Macrium’s Reflect can help. One can use the disk clone function of Reflect for the migration.  It is important to clone the partitions in the same order as the original, and extend the primary partition to use unallocated space before adding another partition to clone.