Memory Startup Checks for Incomplete Writes and Data Erasure

The patent applies preliminary action by ensuring that the last group of data written to memory before power-down contains only non-sensitive data. This is achieved by implementing a write operation that checks data sensitivity and performs erasure or padding operations in advance, so that when the system restarts, no sensitive data remains in the memory buffer. The conditional erasure and padding operations are performed before the power-down event, preventing security vulnerabilities from arising during startup.

The patent applies feedback by implementing a verification mechanism during startup that checks whether the last write operation completed successfully. The system reads back the last written data group and verifies its integrity and completion status. Based on this feedback, the system determines whether to proceed with normal startup or to perform corrective actions such as erasure or padding operations. This feedback loop ensures data integrity while maintaining efficient startup performance.

The patent applies the disposable principle by using non-sensitive reference data as a temporary placeholder to overwrite sensitive data in the last written group. Instead of performing complex erasure operations, the system writes non-sensitive reference data (such as zero values or predefined patterns) to the memory locations that previously contained sensitive data. This disposable approach effectively secures the sensitive data by overwriting it with inexpensive, non-sensitive data, eliminating the need for time-consuming erasure operations while maintaining security.