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Ríomhairí, Ríomheolaíocht Scríobhpholasaí nach ndéanann an chuimhne a nuashonrú gach uair a athraítear an taisce. Ina ionad sin, déantar an chuimhne a nuashonrú nuair a ghlantar iontráil ón taisce chun ligean d'iontráil eile a shliotán a thógáil. Nuair a bhaintear úsáid as aischóipeáil, bíonn gá le giotán i ngach iontráil sa taisce a inseoidh ar athraíodh an iontráil ó lódáladh isteach sa taisce í.
Computers, Computer Science A write policy which does not update memory whenever a cache is changed. Instead, memory is updated only when the entry is purged from the cache to allow another entry to take over its slot. When copy back is used, a bit is needed in each cache entry telling whether the cache entry has been changed since it was loaded into the cache.