The erased volume is written seven times to ensure the data can't be restored.
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Department of Defense (DOD) 5220-22M standard for securely erasing magnetic media.
HOW TO ERASE MAC DISK UTILITY FOR MAC
Department of Defense's 5220-22M standards for erasing magnetic media. How do you choose the best disk utility for mac / macbook pro when important data is lost on drive Here's a recommended solution to use best disk utility to recover lost data.
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7-Pass Erase: This method meets the security requirements of the U.S.The length of time this method takes depends on the size of the volume. It erases the volume's data by writing over it with zeros. Zero Out Data: This method provides a good level of security.It removes the volume's catalog directory but leaves the actual data intact.
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