![]() Then disable it (for the next user).īecause you have a SSD installed in your MBP, you cannot use the 'secure erase', nor the 'erase free space' options in Disk Utility. If you want to be even more certain, turn on File Vault (Apple recommends this) when you reset it. That is, the entire user space is filled with 0s. Physically, each cell would be read back as a 1, however, as a practical matter, the drive sees “empty” cells, and interprets these cells as logical 0, meeting the requirement of SECURITY ERASE UNIT. In fact, once complete, the drive as a unit is now in a performance state that we know as “Fresh-out-of-Box,” or FOB. After this, the storage element is now in a state where it is ready to be programmed with new data from the host computer. Each targeted storage element is raised to an erase voltage (significantly higher than the standard program voltage), then that signal is dropped to ground, leaving no trace of the previous signal.
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