CN112883438A - Solid state disk and data destruction method - Google Patents
Solid state disk and data destruction method Download PDFInfo
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- CN112883438A CN112883438A CN202110318466.6A CN202110318466A CN112883438A CN 112883438 A CN112883438 A CN 112883438A CN 202110318466 A CN202110318466 A CN 202110318466A CN 112883438 A CN112883438 A CN 112883438A
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- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
- G06F21/79—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data in semiconductor storage media, e.g. directly-addressable memories
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Abstract
The application discloses solid state hard drives includes: n output ends of the target controller are respectively connected with control ends of N first destruction switches, first ends of the N first destruction switches are all connected with first ends of second destruction switches, second ends of the N first destruction switches are respectively connected with input ends of N storage medium modules, output ends of the N storage medium modules are all connected with a main controller, a control end of the second destruction switch is connected with the target controller, and a second end of the second destruction switch is used for receiving destruction voltage; and when the target controller detects that the main controller sends out a destruction instruction for destroying the stored data, the second destruction switch is used for controlling the N first destruction switches to destroy all the data stored in the N storage medium modules. The solid state disk can destroy the stored data in the solid state disk under the condition that the MCU control circuit is not added, so that the user experience of people in the use of the solid state disk can be improved.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a solid state disk and a data destruction method.
Background
Solid State Disks (SSD) have the advantages of fast read/write speed, low power consumption, and convenient carrying, so the SSD has been widely used in the field of storage technology. In some special application scenarios, data in the solid state disk sometimes needs to be destroyed, but in the prior art, because the solid state disk itself does not have a data destruction function, in this case, the stored data in the solid state disk can only be destroyed by additionally adding an MCU (Micro Controller Unit) control circuit to the solid state disk, so that user experience of people when using the solid state disk is greatly reduced. At present, no effective solution exists for the technical problem.
Therefore, how to enable the solid state disk to have the data destruction function so as to improve the user experience of people when using the solid state disk is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of this, the present invention provides a solid state disk and a data destruction method, so that the solid state disk has a data destruction function, and thereby user experience of people when using the solid state disk is improved. The specific scheme is as follows:
a solid state disk, comprising: the device comprises a main controller, a target controller connected with the main controller, N storage medium modules, N first destruction switches and a second destruction switch; n is more than or equal to 1;
the N output ends of the target controller are respectively connected with the control ends of the N first destruction switches, the first ends of the N first destruction switches are respectively connected with the first end of the second destruction switch, the second ends of the N first destruction switches are respectively connected with the input ends of the N storage medium modules, the output ends of the N storage medium modules are respectively connected with the main controller, the control end of the second destruction switch is connected with the target controller, and the second end of the second destruction switch is used for receiving destruction voltage;
and when the target controller detects that the main controller sends a destruction instruction for destroying the stored data, the second destruction switch is used for controlling the N first destruction switches to destroy all the data stored in the N storage medium modules.
Preferably, the enable terminal of the target controller is connected to the main controller, and the target controller and the main controller exist in the same chip.
Preferably, the storage medium module is specifically NOR FLASH or NAND FLASH.
Preferably, the method further comprises the following steps: a charging module;
the input end of the charging module is connected with the first end of the second destruction switch, and the output end of the charging module is connected with the first ends of the N first destruction switches respectively.
Preferably, the charging module is a capacitor.
Correspondingly, the present invention further provides a data destruction method, which is applied to the target controller in the solid state disk disclosed above, and includes:
when detecting that the main controller sends a destruction instruction for destroying the stored data, the second destruction switch is used for controlling the N first destruction switches to destroy all the data stored in the N storage medium modules.
Preferably, the process of using the second destruction switch to control the N first destruction switches to destroy all the data stored in the N storage medium modules includes:
and sequentially controlling the N first destruction switches to destroy all the data stored in the N storage medium modules by using the second destruction switch.
Preferably, the method further comprises the following steps:
verifying the destruction instruction;
and when the destruction instruction passes the verification, continuously executing the step of using the second destruction switch to control the N first destruction switches to completely destroy the data stored in the N storage medium modules.
Preferably, the process of verifying the destruction instruction includes:
and checking the destruction instruction by using a parity check algorithm or CRC.
Therefore, in the solid state disk provided by the invention, when the target controller detects that the main controller sends out a destruction instruction for destroying data, the main controller is controlled to stop reading and writing the data, and the second destruction switch is used for controlling the N first destruction switches to destroy all the data stored in the N storage medium modules. Obviously, compared with the prior art, the solid state disk provided by the embodiment can destroy the stored data in the solid state disk without additionally adding an MCU control circuit, so that the user experience of people when using the solid state disk can be obviously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural diagram of a solid state disk according to an embodiment of the present invention;
fig. 2 is a structural diagram of another solid state disk provided in the embodiment of the present invention;
FIG. 3 is a timing diagram illustrating operation of the solid state disk shown in FIG. 2;
fig. 4 is a flowchart illustrating the operation of the solid state disk shown in fig. 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a structural diagram of a solid state disk according to an embodiment of the present invention, where the solid state disk includes: the device comprises a main controller, a target controller connected with the main controller, N storage medium modules, N first destruction switches and a second destruction switch; n is more than or equal to 1;
the system comprises a target controller, N first destruction switches, N storage medium modules, a second destruction switch, a main controller and a main controller, wherein N output ends of the target controller are respectively connected with control ends of the N first destruction switches, first ends of the N first destruction switches are respectively connected with first ends of the second destruction switches, second ends of the N first destruction switches are respectively connected with input ends of the N storage medium modules, output ends of the N storage medium modules are respectively connected with the main controller, a control end of the second destruction switch is connected with the target controller, and a second end of the second destruction switch is used for receiving destruction voltage;
and when the target controller detects that the main controller sends out a destruction instruction for destroying the stored data, the second destruction switch is used for controlling the N first destruction switches to destroy all the data stored in the N storage medium modules.
In this embodiment, a novel solid state disk is provided, through which data destruction can be performed on stored data stored inside the solid state disk without adding an MCU control circuit, and user experience of people when using the solid state disk can be significantly improved by using the solid state disk. Referring to fig. 1, the solid state disk includes a main controller, a target controller, N storage medium modules, N first destruction switches, and a second destruction switch. Suppose that the second destruction switch in the solid-state hard disk is K0, the N first destruction switches are K1, K2, and K3 … … Kn, respectively, and the N storage medium modules correspondingly connected to the N first destruction switches are M1, M2, and M3 … … Mn, respectively.
When the target controller detects that the main controller sends a destruction instruction for destroying data stored in the solid state disk, the target controller controls the N first destruction switches to completely destroy the data stored in the N storage medium modules by using the second destruction switch K0.
When the solid state disk is started to work, firstly, resetting the target controller and each destruction switch, and when the target controller does not receive a destruction instruction, controlling the main controller to execute read-write operation by the target controller; that is, when the target controller does not receive the destruction command, the target controller controls the second destruction switch K0 and the first destruction switches K1, K2, and K3 … … Kn to be in the off state.
When the target controller receives a destruction instruction sent by the main controller, the target controller controls the N first destruction switches to completely destroy the data stored in the N storage medium modules by using the second destruction switch K0. Specifically, when the target controller receives a destruction instruction, the target controller controls the second destruction switch K0 to be turned on, and at this time, the N storage medium modules M1, M2, and M3 … … Mn receive destruction voltages through the N first destruction switches K1, K2, and K3 … … Kn, and in this case, the storage data in the N storage medium modules M1, M2, and M3 … … Mn are destroyed through the destruction voltages.
Obviously, the solid state disk provided by the embodiment can destroy the stored data in the solid state disk without additionally adding the MCU control circuit, so that the complicated step that the stored data in the solid state disk can be destroyed only by additionally adding the MCU control circuit in the solid state disk in the prior art can be omitted, and the user experience of people when using the solid state disk can be obviously improved.
It should be noted that, in practical applications, the target controller may be set as a Programmable Logic Device (PLD), because the PLD has high integration and reliability, and the PLD has the characteristics of short switching period and capability of modifying an edited text at any time, when the target controller is set as the PLD, the convenience of the solid-state hard disk in the using process can be relatively improved.
In addition, compared with the method for destroying the storage data in the solid state disk by using the MCU control circuit in the prior art, the method for destroying the storage data in the solid state disk by using the setting method can also obviously reduce the design cost and wiring complexity for destroying the data in the solid state disk.
As can be seen, in the solid-state hard disk provided in this embodiment, when the target controller detects that the main controller sends a destruction instruction for destroying data, the main controller is controlled to stop reading and writing the data, and the second destruction switch is used to control the N first destruction switches to destroy all the data stored in the N storage medium modules. Obviously, compared with the prior art, the solid state disk provided by the embodiment can destroy the stored data in the solid state disk without additionally adding an MCU control circuit, so that the user experience of people when using the solid state disk can be obviously improved.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the enable end of the target controller is connected to the main controller, so that the target controller and the main controller exist in the same chip.
It can be understood that, when the target controller and the main controller are arranged in the same chip, not only the wiring complexity of the solid state disk can be reduced, but also the target controller can more quickly receive the control instruction sent by the main controller.
Obviously, through the technical scheme that this embodiment provided, can further improve the convenience when people use this solid state hard disk.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the storage medium module is specifically NOR FLASH or NAND FLASH.
In particular, in this embodiment, the storage medium module may be set as NOR FLASH, and since NOR FLASH has a faster reading speed than other storage media, when the storage medium module is set as NOR FLASH, the reading speed of the solid state disk may be further increased.
Alternatively, the storage medium module may be set to NAND FLASH, and NAND FLASH has the advantages of large storage capacity and high rewriting speed, so NAND FLASH is widely used in practical operations. Therefore, when the storage medium module is set to NAND FLASH, the universality of the solid state disk in practical application can be relatively improved.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 2, and fig. 2 is a structural diagram of another solid state disk provided in the embodiments of the present invention. As a preferred implementation, the solid state disk further includes: a charging module;
the input end of the charging module is connected with the first end of the second destruction switch, and the output end of the charging module is connected with the first ends of the N first destruction switches respectively.
In this embodiment, in order to ensure reliability when data stored in the N storage medium modules is destroyed, a charging module is further disposed in the solid state disk, which is specifically referred to in fig. 2. Referring to fig. 3 and fig. 4, fig. 3 is a timing diagram illustrating an operation of the solid state disk shown in fig. 2, and fig. 4 is a flowchart illustrating an operation of the solid state disk shown in fig. 2.
When the solid state disk is started to work, firstly, the EN end of the target controller and each destruction switch are reset, when the target controller receives a destruction instruction, the target controller sends an EN signal to the main controller, at the moment, the main controller stops working, and the target controller starts to destroy the storage data stored in the storage medium module. At this time, the second destruction switch K0 is turned on, the destruction voltage charges the charging module, and when the charging module is charged, the target controller first turns on the first destruction switch K1, and destroys the storage data stored in the storage medium module M1 by using the discharge voltage of the charging module.
When the storage data in the storage medium module M1 is destroyed, the first destruction switch K1 is turned off, and at this time, the first destruction switch K1 blocks the destruction voltage from entering the storage medium module M1, and since there is no consumption of the power consumption device, the charging module is charged again; when the charging module finishes charging, the first destruction switch K2 is turned on, and the storage data in the storage medium module M2 is destroyed by using the discharging voltage of the charging module; when the storage data in the storage medium module M2 is destroyed, the first destruction switch M2 is turned off, and the destruction voltage is blocked from entering the storage medium module M2; at this time, the charging module is recharged due to no consumption of the power consumption device, and when the charging of the charging module is finished, the first destruction switch K3 is turned on, and the storage data in the storage medium module M3 is destroyed by using the discharging voltage of the charging module; based on the same data destruction principle, the target controller destroys the storage data stored in the storage medium modules M4 to Mn in sequence until all the storage data in the N storage medium modules are destroyed.
Obviously, the reliability of destroying the data stored in the solid state disk can be further ensured by the technical scheme provided by the embodiment.
As a preferred embodiment, the charging module is embodied as a capacitor.
It can be understood that, because the capacitor is a common charging module in practical applications, and the capacitor has a simple structure and is safe and reliable in use, when the charging module is configured as a capacitor, the difficulty in designing the solid state disk can be relatively reduced.
Correspondingly, an embodiment of the present invention further provides a data destruction method, where the data destruction method is applied to a target controller in the solid-state hard disk, and the data destruction method includes:
when detecting that the main controller sends a destruction instruction for destroying the stored data, the second destruction switch is used for controlling the N first destruction switches to destroy all the data stored in the N storage medium modules.
In this embodiment, when the target controller detects that the main controller sends a destruction instruction for destroying data stored in the solid-state hard disk, the target controller controls the N first destruction switches to destroy all data stored in the N storage medium modules by using the second destruction switch.
That is, when the target controller detects a destruction instruction sent by the main controller, the second destruction switch is controlled to be turned on, at this time, the N storage medium modules receive destruction voltage through the N first destruction switches, and when each storage medium module receives the destruction voltage, the storage data stored in the storage medium module of the target controller is destroyed by the destruction voltage.
As a preferred embodiment, the above steps: the process of using the second destruction switch to control the N first destruction switches to destroy all the data stored in the N storage medium modules includes:
and the second destruction switch is used for sequentially controlling the N first destruction switches to completely destroy the data stored in the N storage medium modules.
Specifically, in this embodiment, when the target controller receives the destruction instruction sent by the main controller, the target controller may sequentially control the N first destruction switches to completely destroy the data stored in the N storage medium modules by using the second destruction switch.
That is, when the target controller receives the destruction instruction sent by the main controller, the target controller firstly turns on the second destruction switch K0, and when the second destruction switch K0 is turned on, firstly turns on the first destruction switch K1, and destroys the storage data stored in the storage medium module M1 by the destruction voltage; when the storage data in the storage medium module M1 is destroyed, the target controller controls the first destruction switch K1 to be turned off, and turns on the first destruction switch K2, at this time, the destruction voltage destroys the storage data stored in the storage medium module M2; when the storage data in the storage medium module M2 is destroyed, the target controller controls the first destruction switch K2 to be turned off, and turns on the first destruction switch K3, at this time, the destruction voltage destroys the storage data stored in the storage medium module M3; by analogy, when the storage data in the storage medium module Mn-1 is destroyed, the target controller controls the first destruction switch Kn-1 to be turned off and turns on the first destruction switch Kn, and at this time, the destruction voltage destroys the storage data stored in the storage medium module Mn.
Obviously, by the technical scheme provided by the embodiment, the overall reliability of the data stored in the solid state disk in the destroying process can be relatively ensured.
As a preferred embodiment, the data destruction method further includes:
verifying the destruction instruction;
and when the destruction instruction passes the verification, continuously executing the step of using the second destruction switch to control the N first destruction switches to completely destroy the data stored in the N storage medium modules.
It can be understood that, in practical applications, a phenomenon that an illegal person sends an illegal instruction to the target controller and controls the target controller to destroy data stored in the solid state disk may occur. Therefore, in this embodiment, in order to avoid the above situation, the target controller also verifies the destroy instruction when receiving the destroy instruction.
That is, when the destruction instruction passes the verification of the target controller, the step of using the second destruction switch to control the N first destruction switches to destroy all the data stored in the N storage medium modules is continuously executed; and when the destroy instruction does not pass the verification of the target controller, the target controller stops responding to the destroy instruction.
Obviously, the technical scheme provided by the embodiment can further improve the safety and reliability of the solid state disk in the using process.
As a preferred embodiment, the above steps: the process of verifying the destruction instruction comprises the following steps:
the kill instruction is checked using a parity check algorithm or CRC.
Specifically, in this embodiment, the target controller checks the cancellation command through a Parity Check (Parity Check) algorithm, which is convenient to operate and accurate and reliable in Check result, so that when the Parity Check algorithm is used to Check the cancellation command, convenience in checking the cancellation command can be improved.
Or, in practical application, the target controller may also Check the destroy instruction by using a Cyclic Redundancy Check (CRC), because the CRC has a very high checking accuracy and the resource overhead required by the CRC is small, when the CRC is used to Check the destroy instruction, the resource overhead required by the target controller when checking the destroy instruction can be relatively reduced.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The solid state disk and the data destruction method provided by the invention are described in detail above, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the above embodiments is only used for helping understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A solid state disk, comprising: the device comprises a main controller, a target controller connected with the main controller, N storage medium modules, N first destruction switches and a second destruction switch; n is more than or equal to 1;
the N output ends of the target controller are respectively connected with the control ends of the N first destruction switches, the first ends of the N first destruction switches are respectively connected with the first end of the second destruction switch, the second ends of the N first destruction switches are respectively connected with the input ends of the N storage medium modules, the output ends of the N storage medium modules are respectively connected with the main controller, the control end of the second destruction switch is connected with the target controller, and the second end of the second destruction switch is used for receiving destruction voltage;
and when the target controller detects that the main controller sends a destruction instruction for destroying the stored data, the second destruction switch is used for controlling the N first destruction switches to destroy all the data stored in the N storage medium modules.
2. The solid state disk of claim 1, wherein an enable terminal of the target controller is connected to the main controller, and the target controller and the main controller exist in the same chip.
3. The solid state disk of claim 1, wherein the storage medium module is specifically NOR FLASH or NAND FLASH.
4. The solid state disk of any one of claims 1 to 3, further comprising: a charging module;
the input end of the charging module is connected with the first end of the second destruction switch, and the output end of the charging module is connected with the first ends of the N first destruction switches respectively.
5. The solid state disk of claim 4, wherein the charging module is a capacitor.
6. A data destruction method applied to the target controller in the solid-state disk according to any one of claims 1 to 5, comprising:
when detecting that the main controller sends a destruction instruction for destroying the stored data, the second destruction switch is used for controlling the N first destruction switches to destroy all the data stored in the N storage medium modules.
7. The data destruction method according to claim 6, wherein the step of controlling the N first destruction switches to destroy all the data stored in the N storage medium modules by using the second destruction switch comprises:
and sequentially controlling the N first destruction switches to destroy all the data stored in the N storage medium modules by using the second destruction switch.
8. The data destruction method according to claim 6, further comprising:
verifying the destruction instruction;
and when the destruction instruction passes the verification, continuously executing the step of using the second destruction switch to control the N first destruction switches to completely destroy the data stored in the N storage medium modules.
9. The data destruction method according to claim 8, wherein the step of verifying the destruction instruction comprises:
and checking the destruction instruction by using a parity check algorithm or CRC.
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