The latest virtual machine hardware version available yields the best performance and most reliable behavior from the applications running in your virtual machine.
Virtual machines with hardware version 10 or later are created with SATA hard disks or CD drives. Upgrading your virtual machine from hardware version 9 or earlier does not change any devices in your virtual machine to SATA. If you want to use SATA disks or drives with your virtual machine, you must manually change the disk and drive types.