1. A method for executing a transaction regarding information to be stored in a flash type memory device, the method comprising: executing a payload data writing operation relevant to said transaction into a first memory block of said flash type memory device, setting up memory-block specific status information of said first memory block to express that a) payload data written in said first memory block is relevant and b) said transaction is in a commitment process, and processing the payload data written in said first memory block into valid payload data in response to a condition that said memory-block specific status information has been set up to express that a) the payload data written in said first memory block is relevant b) said transaction is in a commitment process.