Method of operating data storage device

• US 10,552,084 B2
• Filed: 04/02/2018
• Issued: 02/04/2020
• Est. Priority Date: 02/28/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Han, Il Su, Jo, Keun Soo, Cho, Hee Chang
• Primary Examiner(s): Bertram, Ryan
• Assistant Examiner(s): Ta, Trang K
• Application Number:
  US15/943,589
• Publication Number:
  US 20180225062A1
• Time in Patent Office: 673 Days
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0632 by initialisation or re-initialisation of storage systems
• CPC Class Codes: G06F 3/0652 Erasing, e.g. deleting, data cleaning, moving of data to a wastebasket
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]

Abstract

A method of operating a data storage device includes: receiving a single wipe device initialization command from a host, and in response to the wipe device initialization command, executing a wipe device initialization operation that during a single time period initializes the entirety of a mapping table defining logical partitions dividing memory space provided by a physical region of the data storage device.

Claims

1. A method of operating a data storage device including a controller and a memory device, the method comprising:

generating mapping information in the controller, the mapping information defining relationships between physical addresses for physical regions of the memory device and logical addresses for logical partitions used to logically divide physical memory space of the memory device;

by operation of the controller, storing the mapping information in the memory device in a form of a mapping table;

by operation of the controller, loading the mapping information from the memory device to the controller;

receiving in the controller a single wipe device initialization command from a host; and

in response to the single wipe device initialization command, executing a wipe device initialization operation that during a single time period initializes an entirety of the mapping table to remove the mapping information from the mapping table,

wherein the data storage device is a universal flash storage (UFS) device, the wipe device initialization command is a FORMAT UNIT command of the UFS device, and the UFS device receives the FORMAT UNIT command by using a UFS device logical unit.

2. The method of claim 1, wherein the UFS device logical unit is one of logical units of the UFS device, the logical units support specific types of commands to allow for an application client to issue requests to receive specific information relating to the UFS device.

3. The method of claim 2, wherein the wipe device initialization operation is fulfilled by issuing the FORMAT UNIT command to all enabled logical units of the UFS device.

4. The method of claim 3, wherein, if a logical unit of the logical units is write protected by one of methods to protect the logical unit, the FORMAT UNIT command fails and a content of storage area corresponding to the logical unit is not altered.

5. The method of claim 4, wherein the wipe device initialization command includes at least one vendor specific bit defined by a vendor in a FORMAT UNIT command descriptor block as provided by JESD220B.

6. The method of claim 5, wherein the FORMAT UNIT command requests for a device server to format storage areas into application client accessible logical blocks, and the device server further creates control structures for management of the storage areas, wherein a degree that the storage areas are altered by the FORMAT UNIT command is vendor specific.

7. The method of claim 1, wherein the wipe device initialization operation further includes, in response to the wipe device initialization command, programming specialty data in the physical regions after erasing all of data stored in the physical regions.

8. The method of claim 7, wherein the specialty data is one of all-zeros, all-ones, and a pattern of all-zeros and all-ones.

9. The method of claim 1, wherein the wipe device initialization operation further includes, in response to the wipe device initialization command, erasing all existing data stored in the physical regions of the memory device without updating the mapping table more than once after initializing the entirety of the mapping table.

10. The method of claim 9, wherein the existing data comprises all decryption keys used to decrypt encrypted data stored in the physical regions.

11. A method of operating a data processing system including an application processor and a data storage device including a controller and a memory device, the method comprising:

communicating a single wipe device initialization command from the application processor to the data storage device; and

in response to the wipe device initialization command, executing a wipe device initialization operation in a single period of time,

the executing the wipe device initialization operation comprising;

initializing an entirety of a mapping table stored in the controller, the mapping table including mapping information defining relationships between physical addresses of physical regions of the memory device and logical addresses of logical partitions into which the physical regions are logically divided, and the initializing comprising removing the mapping information from the mapping table,

erasing existing data stored in the physical regions after initializing the entirety of the mapping table, and

programming specialty data in the physical regions after erasing the existing data,

wherein the wipe device initialization operation initializes all of the logical partitions during the single period of time, and

wherein the data storage device is a universal flash storage (UFS) device, the wipe device initialization command is a FORMAT UNIT command of the UFS device, and the UFS device receives the FORMAT UNIT command by using a UFS device logical unit.

12. The method of claim 11, wherein the UFS device logical unit is one of logical units of the UFS device, the logical units support specific types of commands to allow for an application client to issue requests to receive specific information relating to the UFS device.

13. The method of claim 12, wherein the existing data comprises decryption keys stored in the physical regions and that are used to decrypt encrypted data stored in the physical regions.

14. The method of claim 11, wherein the wipe device initialization operation is fulfilled by issuing the FORMAT UNIT command to all enabled logical units of the UFS device.

15. The method of claim 14, wherein, if a logical unit of the logical units is write protected by one of methods to protect the logical unit, the FORMAT UNIT command fails and a content of storage area corresponding to the logical unit is not altered.