When you move a dynamic disk from one computer to another this dynamic disk is flagged in Disk Manager" as a foreign disk. In order to access this foreign disk you must import it first. If you right click on the foreign disk and the "Import Foreign Disk" is not present, this can happen because the dynamic disk was from a Windows XP Pro machine and the new machine has Windows XP Home installed. Windows XP Home cannot read dynamic disks as they do not have a normal partition table.

To make the disk accessible to the new machine you will need to convert it to a basic disk. However this process will destroy the data on the disk.In this is the case you will need to put the disk back into the original machine and then remove all the data or the most valuable data to another location such asanother hard disk drive present on the old machine ,writable DVD ,another machine on your network (if you have one) and USB thumb drive / memory disk.