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write-back cache

Sam ChenFebruary 15, 2017

In a write-back cache, writes are confirmed to the host immediately after data is written to the cache. From there, data is then written from the cache to permanent storage typically when the cache is full or when the cache is idle.

As the cache is significantly faster to write to compared to permanent storage, the write-back cache is the fastest type of cache however, the speed of the write-back cache does come at a risk of data loss. In the event of sudden power loss, all data in the cache would be lost, including any data not yet written to permanent storage.

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Sam Chen

Hardware and Technology Enthusiast. SSD Evangelist. Editor-in-Chief.