Fast Readable Multi-Cell Coding for Flash Memory

Flash memory is gaining attention for achieving large-capacity and high-speed storage devices. In particular, multi-level flash memory is widely used for increasing storage capacity. However, it faces slower access speeds as the number of read thresholds increases. Sharon et al. proposed the random input-output (RIO) code, which reduces the number of read thresholds to one for multi-level flash memory. However, the RIO code offers lower storage capacity than conventional uncoded multi-level flash memory. We propose SHare Coding (SHC), which maintains storage capacity and achieves higher speeds with fewer read thresholds than conventional uncoded methods.