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Booting from an external SSD (hard disks are too slow) provides a convenient way to test specific versions of macOS or troubleshoot problems with your Mac’s internal storage. However, a little-known gotcha has caused untold hair loss among those trying to boot from an external drive. Macs with Apple silicon cannot start up from external drives connected to their DFU (device firmware update) USB-C port.

We recently helped someone having trouble with 1Password requesting their password repeatedly on their iPad, but not on their iPhone. Since 1Password’s data syncs between devices, this person didn’t realize they needed to configure the app’s security settings separately for each device. It’s appropriate for 1Password to separate security settings—one device could be used in a much more sensitive environment than another—but it’s also easy to see how a user might be confused about the difference in behavior.

When discussing digital security, we typically focus on preventive measures, such as using strong passwords with a password manager, enabling multi-factor authentication, keeping systems up to date, maintaining regular backups, and training employees to recognize potential security threats. While these practices are essential, they don’t guarantee complete protection.