== Virtual Hard drive == 
 Quote: "On May 21, 2008, Microsoft posted a job opening for Windows 7 regarding work to implement VHD support, i.e. support for single-file containers that represent an entire hard drive including partitions, and transparently performing I/O operations on this as a typical hard drive, including boot support. [32]" 

 Isn't that just like "mount -o loop" on linux which has been around since forever?