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壞區管理

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在NAND Flash的製造過程中所產生故障區塊,稱為Early Bad Block。在使用的過程中,也會隨著寫入、抹除的操作次數增加,而逐漸產生故障區塊,稱為Latter Bad Block。 故障區塊管理,是由控制IC來達成故障區塊的管理機制,以偵測並標示NAND Flash中的故障區塊,提升資料存取的可靠度。控制IC的故障區塊管理機制,會在首次啟動NAND Flash時,建立故障區塊表(Bad Block Table),也會將使用的過程中所發現的抹寫錯誤記錄在故障區塊表,並將資料移植到新的有效區塊中,避免資料流失。

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壞區管理
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