Memory card device
US5483491A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1994 |
| Grant date | Jan 9, 1996 |
| Priority date | — |
| Expiry date | Apr 8, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/76
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a memory card apparatus. When one of blocks of a data area of an EEPROM is detected as a defective block, a save area is searched for a vacant block, and data, which is to be written to the defective block, is written to the vacant block of the data area. When the save area is occupied and one of blocks of the data area is detected as a defective block, the data area is searched for a vacant block, and data, which is to be written to the defective block, is written to the vacant block of the data area. When a block of the data area is used for saving the defective block and a vacant block is generated in the save area by erasing data, data of the block of the data area used for saving the defective block is transferred to the vacant block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.