STORAGE DEVICE HAVING VARIOUS RECOVERY METHODS AND RECOVERY MODES

• US 20170315891A1
• Filed: 07/17/2017
• Published: 11/02/2017
• Est. Priority Date: 05/02/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Hyunjung Shin, Isaac Baek, Ji Hyung Park
• Inventors: PARK, JI HYUNG, Shin, HyunJung, Baek, Isaac, Kang, Jeonguk, Ko, Minseok
• Granted Patent: US 10,445,200 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 11/0727 in a storage system, e.g. in a DASD or network based storage system drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: G06F 11/0751 Error or fault detection not based on redundancy power supply failures G06F1/30; network fault management H04L41/06
• CPC Class Codes: G06F 11/0775 Content or structure details of the error report, e.g. specific table structure, specific error fields
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence
• CPC Class Codes: G06F 2201/805 Real-time
• CPC Class Codes: G06F 2201/81 Threshold
• CPC Class Codes: G11C 29/44 Indication or identification of errors, e.g. for repair
• CPC Class Codes: G11C 29/88 with partially good memories
• CPC Class Codes: G11C 29/883 using a single defective memory device with reduced capacity, e.g. half capacity

Abstract

A storage device including: a nonvolatile memory device including a plurality of nonvolatile memory cells, a partial storage area and an overprovision storage area; and a controller configured to control the nonvolatile memory device, wherein when the controller detects a fault of the nonvolatile memory device, the controller negates the partial storage area, reassigns the overprovision storage area, which corresponds to a size of a user area, among the partial storage area, determines a device fail if the overprovision storage area is less than an overprovision threshold after the reassigning of the partial storage area, and determines a recovery success if the overprovision storage area is equal to or greater than the overprovision threshold after the reassigning of the partial storage area.

Claims

1. A storage device, comprising:

a nonvolatile memory device including a plurality of nonvolatile memory cells forming a user area and an overprovision storage area; and

a controller configured to control the nonvolatile memory device, wherein when the controller detects a fault of the nonvolatile memory device, the controller negates a partial storage area including the fault in the nonvolatile memory device, reassigns a partial overprovision storage area corresponding to a size of a partial user area among the partial storage area to the user area, determines a device fail if a size of the overprovision storage area is less than an overprovision threshold after the reassigning of the partial overprovision storage area, and determines a recovery success if the size of the overprovision storage area is equal to or greater than the overprovision threshold after the reassigning of the partial overprovision storage area.

2. The storage device of claim 1, wherein the controller controls the storage device to be used for a read only operation if the device fail is determined.

3. The storage device of claim 1, wherein the controller prohibits an access to the storage device if the device fail is determined.

4. The storage device of claim 1, wherein the overprovision storage area is a supplemental storage area which is not accessed by an external device.

5. The storage device of claim 1, wherein the controller uses the overprovision storage area for a swap of a wear leveling or a replacement of a bad block.

6. A storage device, comprising:

a nonvolatile memory device including a plurality of nonvolatile memory cells; and

a controller configured to control the nonvolatile memory device, wherein

when the controller detects a fault of the nonvolatile memory device, the controller selects a recovery method among a plurality of recovery methods, and recovers the fault using the selected recovery method.

7. The storage device of claim 6, wherein the controller selects the recovery method based on a type of the fault, a level of the fault, a size of a storage area including the fault, an address of the storage area including the fault, or a history associated with the fault.

8. The storage device of claim 6, wherein the selected recovery method negates a partial storage area including the fault.

9. The storage device of claim 8, wherein the controller formats a remaining storage area except the partial storage area.

10. The storage device of claim 8, wherein the controller reassigns a partial overprovision storage area corresponding to a size of a partial user area among the partial storage area to a user area, determines a device fail if a size of an overprovision storage area is less than an overprovision threshold after the reassigning, and determines a recovery success if the size of the overprovision storage area is equal to or greater than the overprovision threshold after the reassigning.

11. The storage device of claim 8, wherein the controller calculates a size of a remaining storage area except the partial storage area, determines the size of the remaining storage area as a size threshold, and prevents writes to the storage device that exceed the size threshold.

12. The storage device of claim 8, wherein the controller reduces a logical address range by as much as the partial storage area, and remaps a logical address, which corresponds to a valid data and is released from the logical address range, to another logical address belonging to the reduced logical address range.

13. The storage device of claim 6, wherein the recovery methods include fixing a mapping between a physical address and a logical address corresponding to the partial storage area, and preventing an access to the fixed addresses.

14. The storage device of claim 6, wherein the controller sends information of the fault, information of the selected recovery method, or information of a result of a recovery operation using the selected recovery method.

15. A storage device, comprising:

a nonvolatile memory device including a plurality of nonvolatile memory cells; and

a controller configured to control the nonvolatile memory device, wherein

when the controller detects a fault of the nonvolatile memory device, the controller detects a recovery mode upon detecting the fault, selects a recovery method and performs a recovery of the fault itself if the recovery mode is a first recovery mode, and queries the recovery method to an external host device if the recovery mode is a second recovery mode.

16. The storage device of claim 15, wherein, in the first recovery mode, the controller selects the recovery method among a plurality of recovery methods to recover the fault.

17. The storage device of claim 15, wherein, in the second recovery mode, the controller recommends available recovery methods to the external host device.

18. The storage device of claim 15, wherein, in the first recovery mode, the controller negates a partial storage area including the fault, reassigns a partial overprovision storage area corresponding to a size of a partial user area among the partial storage area to a user area, determines a device fail if a size of an overprovision storage area is less than an overprovision threshold after reassigning the partial overprovision storage area, and determines a recovery success if the size of the overprovision storage area is equal to or greater than the overprovision threshold after the reassigning.

19. The storage device of claim 15, wherein the recovery mode is set according to an external control.

20. The storage device of claim 20, wherein an initial setting of the recovery mode is the first recovery mode, and

wherein the controller enters the second recovery mode if a device fail occurs in the first recovery mode.