檔案系統（粵拼：dong2 on3 hai6 tung2）係作業系統當中用嚟控制「數據點樣儲起同提取」嗰部份：檔案系統做嘅主要係將一部電腦入面啲數據斬件分好，而且每一件數據（一個電腦檔案；file）都同佢改返個名，等用家能夠輕鬆噉睇得出邊件數據打邊件；冇咗檔案系統嘅話，部電腦入面嗰啲數據只會係一大嚿雜亂無章嘅數據，冇方法俾用家知道邊一段係屬邊件數據，更加唔會做到正確噉儲起同提取數據[1]。
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