Moving sequential sectors within a block of information in a flash memory mass storage architecture
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United States of America Patent
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Jul 27, 1999
Issued Date -
N/A
app pub date -
Oct 7, 1997
filing date -
Jul 31, 1995
priority date (Note) -
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Abstract
A method and apparatus is disclosed for increasing the system performance of a digital system having a controller for controlling nonvolatile devices for storing blocks of information, each block having a group of sectors. When sectors within a block are being re-written in sequential order, the controller writes the new sector information into a sector location of another block without the need to move any of the sectors within the original block thereby reducing the number of read and write cycles needed to avoid erase-before-write operations. A `used` flag, stored in the sector location of each block, indicates that the sector has been transferred to another block or, alternatively, a move locator word maintains status information regarding the position of the sectors within the block that have been moved.
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