Flash controller is the core hardware embedded in today's mobile device storage, and the flash translation layer (FTL) is the key system of controller. This Letter proposes a high-efficient superblock FTL (HSPB) to satisfy the demand of large media files and application files storage, which implements the cross-block sequential writing strategy and the shared cached mapping table scheme. Test results show that HSPB reduces the time and power consumption by 7–30% in seq/random write and gains up to 60% improvement in sequential/random read compared to other FTLs.