"External drive is readable on my Mac but password-protected on others: My daughter's Mac is backed up on a Toshiba external drive. When her Mac died she borrowed a friend's to access her backup files and folders but all are password protected even though she could open them freely on her own Mac."
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Getting this Data:
Have your friend create a new guest user on their Mac, and then use Migration Assistant to export data from the Time Machine Backup. See if you no longer get this.
Confirm the Encryption:
Open Disk Utility, and then elect the drive. See if you see the word "(Encrypted)", located at the far-right of the dulled-out line below the hard drive name.
Getting Into Disk Utility:
- Click: the Desktop
- Click: Go menu (in the taskbar)
- Select: Utilities
- Open: Disk Utility
- Click: the drive