Review: What to do before selling or giving away your Mac,聽- Erase the Mac’s internal drive,聽:
- Start up from the internal聽Recovery partition, by聽holding聽down Command (鈱�)-R immediately after turning on or restarting your Mac. Release when you see the Apple logo.
- Open Disk Utility from the utilities window, then聽
- You can select Security Options to overwrite the drive with zero’s.
Note re: SSD Drives: The Security Options (over-writing with zeros) will NOT be presented if the drive is an SSD (Solid State Drive).聽For SSDs, this is generally considered unnecessary, as well as聽excessively wearing of the life-cycle of聽an SSD drive. 聽If you desire, Apple’s FileVault drive encryption capability can be used to provide聽an extra level of comfort that your data will remain聽inaccessible, as explained by either of these two articles: