In less than 25 years this will rise to more than half of the rail network being at risk, according to the government's own figures.
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，这一点在91视频中也有详细论述
World Service,·23 Feb 2026,·26 mins
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The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.