JT said:
The answer to your problems may involve that "somehow". Disks don't change
themselves, this disk was changed to a dynamic disk by someone. You should
find out who and exactly what they did.
one of our disks was "changed" to list as a Dynamic Disk (200 GB) and
doesn't show in My Computer but is displayed in the BIOS and in Device
Manager.
How do we get this back to a useable hard drive if possible? There is a
lot of data on it that we don't want to loose.
Assuming that changing to a dynamic disk is all that has been done, the
partition should still be there on the disk. Go into disk manager and ensure
the disk is marked as online. Right click it and select the option to bring
it online if it is not.
Next, if you still can't see the partition in My Computer, right click on it
in disk manager and choose "Change Drive Letter and Paths" and assign it a
drive letter. If no partitions are visible then your problem is not that
someone 'upgraded' this disk to a dynamic disk but rather that they decided
to helpfully format the disk at the same time.