1. A method comprising: receiving a data block in a received form; performing a first compression technique comprising: compressing said data block in received form with a first encoder to provide a first compressed data block, and compressing said first compressed data block with a second encoder to provide a second compressed data block; comparing said second compressed data block against a threshold, wherein said threshold is indicative of data expansion; and providing said second compressed data block to a device, if no data expansion is determined to have occurred based on said comparing.