There are several use cases and advantages of the vFlash media card. One advantage of vFlash is that the image is always present, and does not rely on costly network infrastructure to be retrieved from a remote location. It provides on demand local storage since partitions can be created as needed and exposed when required; this storage can also be hidden when it is not needed.  Multiple partitions sizes and formats can be created on a single SD card, and the vFlash partition can emulate a floppy disk, CD-Rom or a hard drive. It is possible to use vFlash partitions for a number of backup scenarios. 1.    The operating system can be backed up on a vFlash partition, so that the system can be immediately rebooted to the vFlash if it cannot be booted from the hard drive. 2.    Critical data can be backed up on the vFlash if it needs to be isolated from the hard disk drive. 3.    The system configuration can be backed up, and later restored from a vFlash partition. 4.    A vFlash partition can be used as a “crash dump” location for Linux servers. 1.    Operating system images can be hosted on a remote NFS or CIFS file share, and iDRAC6 can upload the image locally to a vFlash partition. 2.    vFlash storage can be used to backup hypervisors.
I have a query on Dell USC (unified Server configuration) which is present in PE R710. In the document, it is mentioned that USC is embedded on motherboard.  My query is:- 1) Is USC feature is dependent on iDRAC6 or SD card to work fully functional?  2) What kind of advantage can user get by using SD-card along with iDRAC6 enterprise? 
reg Dell USC and iDRAC6 with SD-CARD