A storage system creates an abstraction of flash Solid State Device (SSD) media allowing random write operations of arbitrary size by a user while performing large sequential write operations of a uniform size to an SSD array. This reduces the number of random write operations performed in the SSD array and as a result increases performance of the SSD array. A control element determines when blocks from different buffers should be combined together or discarded based on fragmentation and read activity. This optimization scheme increases memory capacity and improves memory utilization and performance.