MEMORY DEVICE AND DATA STORING METHOD

• US 20150242141A1
• Filed: 09/03/2014
• Published: 08/27/2015
• Est. Priority Date: 02/25/2014
• Status: Active Grant

• Current Assignee: Kioxia Corporation
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kondo, Nobuhiro, KUO, Yaotung, Nagai, Koichi, Sawamura, Shoji
• Granted Patent: US 9,354,818 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 11/00 Error detection; Error correction; Monitoring error detection, correction or monitoring in information storage based on relative movement between record carrier and transducer G11B20/18; monitoring, i.e. supervising the progress of recording or reproducing G11B27/36; in static stores G11C29/00
• CPC Class Codes: G06F 2206/1014 One time programmable [OTP] memory, e.g. PROM, WORM
• CPC Class Codes: G06F 3/0616 in relation to life time, e.g. increasing Mean Time Between Failures [MTBF]
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0623 in relation to content
• CPC Class Codes: G06F 3/0625 Power saving in storage systems
• CPC Class Codes: G06F 3/065 Replication mechanisms
• 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]
• CPC Class Codes: G06F 3/0688 Non-volatile semiconductor memory arrays
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

According to one embodiment, a data storing method includes saving data stored in a memory device to a host device and verifying validity or accuracy of the data saved in the host device.

Claims

1. A memory device, comprising:

a non-volatile memory;

a volatile memory that stores data read from the non-volatile memory;

a data save unit that saves to a host device the data stored in the volatile memory; and

a data verification unit that verifies validity or accuracy of the data saved in the host device.

2. The memory device according to claim 1, further comprising a verification data addition unit that adds verification data for use in verification by the data verification unit to the data saved to the host device.

3. The memory device according to claim 2, further comprising:

an encryption unit that encrypts the data saved to the host device; and

a decryption unit that decrypts the encrypted data.

4. The memory device according to claim 3, wherein the verification data is a checksum or a hash.

5. The memory device according to claim 4, wherein, when a shift takes place from a normal operation mode to a low-power consumption mode, the data stored in the volatile memory is saved to the host device.

6. The memory device according to claim 5, wherein, when a shift takes place from the low-power consumption mode to the normal operation mode, the data saved in the host device is returned to the volatile memory.

7. The memory device according to claim 4, wherein, when there is no match between a checksum or a hash determined from the data saved in the host device and a checksum or a hash added to the data saved in the host device, the non-volatile memory is accessed to recover the data saved in the host device.

8. A data storing method, comprising:

saving data stored in a memory device to a host device; and

verifying validity or accuracy of the data saved in the host device.

9. The data storing method according to claim 8, wherein the verification is performed at the memory device side.

10. The data storing method according to claim 8, wherein the verification is performed at the host device side.

11. The data storing method according to claim 8, wherein verification data for use in the verification is added to the data saved to the host device.

12. The data storing method according to claim 11, wherein the addition is performed at the memory device side.

13. The data storing method according to claim 11, wherein the addition is performed at the host device side.

14. The data storing method according to claim 11, further comprising:

encrypting the data saved to the host device; and

decrypting the encrypted data.

15. The data storing method according to claim 14, wherein the verification data is a checksum or a hash.

16. The data storing method according to claim 11, wherein, when a shift takes place from a normal operation mode to a low-power consumption mode, the data stored in the volatile memory is saved to the host device.

17. The data storing method according to claim 16, wherein, when a shift takes place from the low-power consumption mode to the normal operation mode, the data saved in the host device is returned to the volatile memory.

18. The data storing method according to claim 15, further comprising restoring the data saved in the host device when there is no match between a checksum or a hash determined from the data saved in the host device and a checksum or a hash added to the data saved in the host device.

19. The data storing method according to claim 15, wherein the checksum or the hash is calculated from the data saved to the host device before encryption.

20. The data storing method according to claim 15, wherein the checksum or the hash is calculated from the data saved to the host device after encryption.