Methods and systems for adaptive mapping for data compression on a storage device is provided. The method includes determining a data request pattern of a workload, determining whether to use at least one of a segment mapping mode or a hash mapping mode for mapping the workload, dividing a space on the storage device into a plurality of defrag units for storing data, and assigning the plurality of defrag units as being at least one of a segment defrag unit or a hash defrag unit. The method also includes when the data request pattern is for the segment mapping mode, storing the data on at least one of the plurality of defrag units assigned as the segment defrag unit, and when the data request pattern is for the hash mapping mode, storing the data on at least one of the plurality of defrag units assigned as the hash defrag unit.