How does the write-through procedure work?

The write through procedure is done by writing directly into the memory and cache simultaneously. Although using the write through procedure does minimize the risk of data loss, every write operation that is done must be done twice, doubling the time and making the process redundant.

The cached data will allow for the fast retrieval on demand, while the data in the main memory will ensure that if there is a crash, power loss or other system disruption occurs, the data will remain intact and not be lost. Write through is the preferred method of storage in applications in which data loss cannot occur, such as medical information and banking.