I am going to guess you cannot perform this operation because your operating system is part of this harddrive. Normally this is done in DOS mode. Maybe just get another harddrive; they are so inexpensive now-a-day.
I tried to partition my c drive (containing os) by using disk management. after shrinking the drive, when I try to create a new volume from the unallocated space I get the following message:
"Dynamic disks are not supported by this operating system"
I am using genuine windows 7 home basic. i3 processor 370m, ddr3 3gb ram, and trying to partition my 220gb c drive
Please tell me the difference between "basic drive" and "dynamic drive" also.