A purpose of the memory integrity test is to identify “ Unavailable” portion of memory and make a determination of memory integrity , not just detection of a data error .The “ 737 “ patent consistently defines “ Defects “ as pertaining to the recordable media not just a defect in the data.

Verify the integrity of the recording medium

“ 737 “ at Abstract

Therefore , no portion of a memory segment can be lost by erroneously recording to memory that was defective before the message was recorded. This , application also discloses a method for testing the integrity of all the memory space on the recording medium , which includes the steps of (i) starting the test of memory integrity by manually inserting a recording medium device into a plug assembly for electrically coupling to said recording device , or manually installing batteries in the recording device after coupling the recording device , and (ii) allowing the said recording device to mark memory segments that will be skipped during recording if they are determined to be defective.