A flash storage system accesses data interleaved among flash storage devices. The flash storage system receives a data block including data portions, stores the data portions in a data buffer, and initiates data transfers for asynchronously writing the data portions into storage blocks interleaved among the flash storage devices. Additionally, the flash storage system may asynchronously read data portions of a data block interleaved among the storage blocks, store the data portions in the data buffer, and access the data portions from the data buffer.