i just bought a 3TB external hard drive. i noticed it reads kind of slowly, especially when i first open it in explorer, so i decided to try to partition it.
i saw the tutorial on shrinking and partitioning hard drives on this forum and used the windows 7 disk manager to shrink and partition the hard drive. it partitioned it into 3 parts; one 1.3 TB, and two 700 GB partitions. the 1.3 TB one is the primary volume so i didn't mess with it. i successfully partitioned and formatted the first 700 GB partition into a simple, but for the second one the option for 'new simple volume' is greyed out.