Front-end data storage method and device

The invention provides a front-end data storage device applied to front end equipment. The front end equipment is connected to a network storage device through a network. The device comprises a writing judging unit and a data filling unit, wherein the writing judging unit is used for judging whether index data written at present can cover the overall index area when the index data are written into corresponding index area, if so, writing is carried out, otherwise, index data are transferred to the data filling unit for processing; the data filling unit is used for filling the index data by invalid data, so that the filled index data can cover corresponding index area, and submitting the filled index data into the data writing unit. Compared with the prior art, as the index data are filled in the front end, an operation of reading additionally disk data caused by reconstruction writing when the index data are written is avoided, and the writing performance and efficiency are improved.