Patent ID: 8005851

Claim:
A computer readable storage medium comprising computer readable instructions configured to perform a method comprising: receiving a first start request to launch a virtual application; instantiating a virtual hard disk comprising a single file, said single file being comprised of a plurality of blocks; establishing a connection to a virtual application server; retrieving a first subset of said blocks from said virtual application server, said first subset being less than said single file; launching said virtual application using said subset of said blocks; performing at least one validation on each of said blocks in said first subset; storing said blocks in said virtual hard disk; detecting a request for a second block; determining that said second block is not present in said virtual hard disk; sending a request to said virtual application server for said second block; receiving said second block; performing said at least one validation on said second block; storing said second block in said virtual hard disk; and enabling said second block to be called by said virtual application.