HP 5800 Series Configuration Manual page 122

Safe mode—This is the mode when using save with the safely keyword. The file saves more slowly but
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can retain the configuration file in the device even if the device reboots or the power fails during the
process.
The fast saving mode is suitable for environments where the power supply is stable. The safe mode is
preferred in environments where a stable power supply is unavailable or remote maintenance is involved.
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