Write-Back Caching

 A caching optimization wherein data written to the slow store is cached until the cache is full or until a subsequent write operation overwrites the cached data. Write-back caching can significantly reduce the write operations to a slow store because many write operations are subsequently obviated by new information. Data in the write-back cache is also available for subsequent reads. If something happens to prevent the cache from writing data to the slow store, the cache data will be lost.