Method and device for quickly clearing data in storage medium

Abstract

The invention provides a method and a device for quickly clearing data in a storage medium. The method comprises the following steps of: judging whether the storage medium is a master boot partition or a boot record partition; determining the partition type; determining a file system index table and the root directory position, and determining the corresponding directory or file in the root directory according to the attribute in the file system index table; in the case of corresponding file, searching for and deleting the file and the corresponding information of the file in the file system index table; otherwise, continuously searching for the final directory in a recursive mode; if the directory does not include any other file, clearing the directory structure and the corresponding information of the directory in the file system index table, and returning to the parent directory; and deleting the file and directory in a recursive mode until the root directory. The invention also provides a system using the method. Through the method and device provided by the invention, data analysis and clearing can be performed based on a file system, the storage medium is not subjected to reading / writing operation, and the data clearing time is shortened.

Description

technical field [0001] The invention relates to the field of data storage, in particular to a method and device for rapidly clearing data in a storage medium. Background technique [0002] The existing way of erasing data in the storage medium is to repeatedly write the entire storage medium, thereby destroying the integrity of the data and achieving the purpose of erasing the data. However, as the capacity of the existing storage medium is increasing, the reading and writing speed of the storage medium has not been greatly improved, so the method of erasing data in a complete manner will consume a lot of time. [0003] There are two existing methods for clearing data in the storage medium, one is the complete erasure method, the disadvantage of this method is that the data clearing time is proportional to the capacity of the storage medium and the read and write speed, and is directly proportional to the actual data content in the storage medium. The size is irrelevant, so...

AI Technical Summary

Problems solved by technology

However, with the increasing capacity of existing storage media, the read and write speed of storage media has not been greatly improved, so the method of completely erasing data will consume a lot of time

[0003] There are two existing methods for clearing data in the storage medium, one is the complete erasure method, the disadvantage of this method is that the data clearing time is proportional to the capacity of the storage medium and the read and write speed, and is directly proportional to the actual data content in the storage medium. The size is irrelevant, so no matter how many data rooms are stored in the storage medium, its clearing time is very long; the other is to clear the data in the storage medium based on file content shredding, which can quickly clear the specified file content, but now In some file systems, the attribute information of the file is separated from the content of the file. The attribute information includes the file name, file size, file creation and modification time, etc., but this method cannot clear the attribute information of the file, resulting in some parts of the file information leakage

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