Memory card apparatus including a link table for managing the correspondency between the recorded contents in the memory card and that in the link table
US5745912A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Aug 28, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2101/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A memory card apparatus has an EEPROM as a semiconductor memory. Each time data is written in the EEPROM, link data representing a recording location of the data is written and managed in a link table. The link table has a flag region with a flag which is set when data write in the EEPROM is requested and is reset when the link data has completely been written in the link table. In case of card removal during operation or power failure, the flag set in the flag region of the link table is not reset and remains. Thus, by checking the flag area of the link table, the occurrence of card removal during operation or power failure can be detected, and various countermeasures can be conducted. Thus, the correspondency between the recorded contents in the EEPROM and the contents in the link table can be maintained as much as possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.