Abstract: Provided is a light-emitting composition including a light-emitting compound that exhibits afterglow and represented by the following General Formula (1). where Xn represents 1-4 carboxyl groups, dihydroxybornyl groups, or the like, and Y1m represents 0-2 halogen atoms, methoxy groups, or phenyl groups.

Abstract: A storage system configuring a logical storage device by dividing an area on a physical storage space formed by a group of several physical storage devices by the unit of physical block having a certain block length and by assigning the physical storage space in every physical block, comprises a logical storage control table which records identification information indicating whether a physical block is assigned to data or operation is bound to data created from a predetermined data arrangement pattern in every area on the logical storage device, and a data writing unit which, upon receipt of a request of writing data into an area of the logical storage device, when a data arrangement pattern of the writing request agrees with a previously-registered data arrangement pattern, records the identification information of the same data arrangement pattern into the logical storage control table correspondingly to the writing-requested area and abandons the writing request data.