Method used by SmartErase to destroy data

SmartErase uses the overwrite function to destroy data on LUNs. SmartErase provides the following data destruction methods:
1. DoD 5220.22-M is a data destruction standard put forward by the US Department of Defense (DoD). The standard provides a software method of destroying data on writable storage media, namely, three times of overwriting.
2. For customized overwriting, a system generates data using internal algorithms and uses the data to overwrite all addresses of LUNs for specific times. The times of overwriting range from 3 to 99. The default value is 7.

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