When I am trying to partition new drive from C drive. My C rive have 450 GB Space, so wanted to make a new drive of 250 GB. Did the basic steps but when clicking on Finish I get the following error " The operation you selected will convert the selected basic disk(s) to dynamic disk(s). If you convert the disk(s) to dynamic, you will not be able to start installed operating systems from any volume on the disk(s) (except the current boot volume). Are you sure you want to continue?". Please help
You already have four primary partitions, there is a way to remove the "system reserve" partition http://www.terabyteunlimited.com/kb/article.php?id=409 and the you could create more partition, or you can use AOMEI Partition Assistant first convert one of the non important primary partition to logical partition and then you could split your C partition, you can google this software.