Data secure erasing method and device

Abstract

Provided are a method and a device for secure data erasure, the method comprising: receiving instruction information for secure data erasure, the instruction information comprising a logic address of data requiring secure erasure (10); and acquiring, through searching for a pre-maintained mapping relationship, all physical addresses corresponding to the logic address, and erasing data in storage units corresponding to the acquired physical addresses (20). Every time data is written into a storage unit corresponding to a physical address, a mapping relationship between the physical address where the data is written and the logic address is established among other mapping relationships. In the present solution, data is erased from corresponding storage units of all physical addresses corresponding to a logic address where specified data is stored, so that data specified by a user can be completely erased from a storage medium, thereby effectively protecting secure information of the user.

Description

technical field [0001] The invention relates to the technical field of storage, in particular to a method and device for securely erasing data. Background technique [0002] Solid State Drive (Solid State Drive), also known as electronic hard disk or solid state electronic disk, is a hard disk composed of a control unit and a solid state storage unit (such as a NAND FLASH chip). Different from the traditional disk writing process, SSD can perform multiple read operations after writing data, but before performing data writing, the location must be erased first, and then new data can be written. [0003] In order to avoid the impact of frequent execution of erasing operations on the life of the SSD, and the removal of valid data each time the data is erased, therefore, in the prior art, when the SSD performs a write operation, it usually stores data at a new physical address. The unit writes new data instead of writing new data in the original address after erasing the origin...

AI Technical Summary

Problems solved by technology

[0004] However, the inventor found that in the prior art, when the user needs to write new data at a specified address to overwrite the original data, or to delete the data at the specified location, only the mapping relationship between the logical address and the physical address of the data is cleared. The information to the user indicates that the original data has been overwritten or deleted, but in essence, the original data still exists, and the data can be read by professional and technical personnel, so the existing technology cannot guarantee that the deleted data information will not be leaked

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