I followed the instructions exactly, but diskpart threw up an error which says it cannot create the partition.

>select disk 0
>disk 0 is now the selected disk.

Now, on this disk there are the above mentioned partitions, the first in line being the 150GB one.

>create partition primary size=146000 id=af (146gb is stated capacity in Explorer)
>Diskpart was unable to create the specified partition.

Have also tried:
>list partition
>select partition 1
>create partition primary size-16000 id=af

Still no joy. Help?

Nicholas.