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Unlock Your Mac Using Your iPhone's Touch ID or Lock Screen PasscodeĪfter 5 Years, Touch ID Is About to Get Read Its Last Rites Quickly Disable Touch ID on Your iPhone for Extra Security in a Pinch Use All 10 Fingerprints for Touch ID on Your iPhone - Not Just 5 of Them To try this out for yourself, open "System Preferences" on your Mac, then click "Touch ID." If there's an available fingerprint slot, click "Add Fingerprint" and enter your user password when prompted. Step 1: Add a Fingerprint or Delete Existing Prints If you share your MacBook and don't have different user accounts for each person, you could use this trick to register fingerprints from different people on one account. Doubled, that means up to six for your account and up to four for another user. Your Mac can save up to five fingerprints across all user accounts, but only up to three per account. It only takes up one of your scan slots, so doing the same for the other two slots means you can have a maximum of six fingerprints saved for Touch ID on one user account. The result? When the scan is finished, you now have the ability to unlock your Mac with either of the fingers you made the scan with. Essentially, macOS is scanning your two fingerprints as one, and all scans are encrypted and stored offline in the MacBook's Secure Enclave.
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You would think that switching between fingers during a scan would trigger an error message in macOS that makes you start over, but you can change fingers during the scanning process without any issues. While this method helps ensure that most unlock attempts are successful, you could easily take advantage of those multiple scans to double up fingerprints.
FINGERPRINT READER FOR MAC OS PRO
When setting up a fingerprint with Touch ID for the first time, your MacBook Pro or MacBook Air takes multiple scans of each fingerprint to ensure that macOS has a complete picture of your unique print.