Jane C,
Now that's not good news. What do I do now? Can I make it an external drive?
No. As Jane said, dynamic disks aren't supported in Home Basic or Home
Premium. It doesn't matter whether the drives are internal or
external; dynamic disks are not supported.
If you have dynamic disks you want to use with Home Premium, you'll
need to copy them to basic disks. You can do that on a computer
running XP Professional Vista Enterprise, or Vista Ultimate. You could
either mount the dynamic drive temporarily within the machine to do
the copy or use it externally mounted in an external USB enclosure.