The present invention discloses a computer-readable storage medium having computer-readable code embodied on the computer-readable storage medium, the computer-readable code including: program code for interleaving fast-reading data and filler data in fast pages and slow pages, respectively. A computer-readable storage medium having computer-readable code embodied on the computer-readable storage medium, the computer-readable code including: program code for reconstructing a data object from data stored only in designated pages. Preferably, the designated pages are fast pages or slow pages. A computer-readable storage medium having computer-readable code embodied on the computer-readable storage medium, the computer-readable code including: program code for at least one data object configured to be stored in fast pages and slow pages, wherein initial pages of at least one data object are stored only in primary pages, and the subsequent pages of at least one data object are stored only in secondary pages.