Terminal device and method for unrecoverably deleting data by using same
OwnerJong Sung Parkinventor
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Abstract
In a method of unrecoverably deleting data stored in a sector of a hard disc or a page of a solid state drive (SSD), allocation information allocated to the data stored in the sector of the hard disc or the page of the SSD is deleted, and a data area is overwritten with a predetermined character. When data stored on a hard disc or an SSD is detected, not only allocation information is deleted but also data to be deleted is overwritten with predetermined data such as characters, so that the data to be deleted cannot be restored, whereby risk of data exposure can be prevented.
Claims9
A method of unrecoverably deleting data stored in a sector of a hard disc or a page of a solid state drive (SSD), the method comprising:
- deleting allocation information allocated to the data stored in the sector of the hard disc or the page of the SSD;
- and
- overwriting a data area with a predetermined character.
A terminal device comprising:
- user mode in which an application program is implemented;
- kernel mode in which an operating system is implemented;
- and
- hardware,
- wherein, in the kernel mode, a simple deletion scheme of deleting allocation information of a file by receiving a request for file deletion processing through a system call from Application 1 which is an application program is executed, and
- in the kernel mode, a complete deletion scheme of adding a user system call for data deletion, deleting allocation information of a file by receiving a request for file deletion processing through the user system call from Application 2 which is an application program, and unrecoverably deleting the file by overwriting a data area with a predetermined character is executed.
Dependencies are inferred from the claim text.