Embodiments are described for a method and system for performing data writes in a virtual tape emulation system. A parallel processing component receives data blocks from a mainframe host and upon receipt provides indication to the mainframe that a current block is received so that the mainframe can proceed to send the next block while the current block is processed. The component initiates parallel processing of the received block in a separate task, and as the operation completes, the data is written to non-tape media in a block-wise manner.