Problem with Partition Magic - no file i/o

I have Partition Magic 8.05

 

Because of a computer crash, I decided ( not wisely!) to attempt to add a partition to an external drive. It is a Seagate freeagent Pro 750Gb. connected by USB2.0  port.

 

 

I moved the drive to a different computer, fired up Partition Magic and I requested a new 100Gb partition.  I did NOT back up the 380Gb of data on the drive when I started.

 

PM made the 100Gb partition and gave it a name.  The remaining drive partition 'lost' its name in the process.  Using the PM browser I can 'see' the data on my drive ( which I changed to a logical partition)  However Windows ( I run XP pro) cannot see the partition.

 

The PM creation process finished with an error message  - sorry I did not get the number - stating that the data in this partition did not have a file i/o.

 

When I ask PM to check the partion stucture it comes back with 'no errors'

 

What can I do?  I do not want to lose the data if I can help it.  I guess that because PM have done such a good job for me over the  past many years I have become far too careless about backups before changing partitions