Please review explanation for detailed answer.
Right click on disk 1, click on initialize
Choose disk and option as MBR. Hit ok.
Again, right click on disk 1 and choose convert to dynamic disk.
Now right click on disk 1 and choose new simple volume.
Specify storage as 256000 and assign a drive letter F and choose file system as NTFS and click finish.
Do the same thing for rest of space of disk 1, assigning 512000MB and using Disc G Here are the screen shots showing this process:







