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.
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Storage <|-- CsvStorage，详情可参考heLLoword翻译官方下载
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Carr said he was aware of the risks as he painstakingly removed the brittle finds from their block of soil