write-back cache


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write-back cache

A disk or memory cache that supports writing. Data normally written to memory or to disk by the CPU is first written into the cache. During idle machine cycles, the data are written from the cache memory to main memory or to disk. Write-back caches improve performance, because writing to the cache is faster than writing to main memory or disk.

Disk Writes
A disk write-back cache does add a slight amount of risk, because the data remain in volatile memory longer. When the computer is turned off, the operating system ensures that the data written to the cache are saved before powering down. See write-through cache and cache.
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References in periodicals archive ?
The reason that this more global type of corruption occurs is due to another problem with using a write-back cache. This second problem involves the sequencing of data that enters and exits the write-back cache.
If the data in a write-back cache is lost, the application is oblivious to the loss since the controller has acknowledged the write as complete.