How to Password Protect a Folder on External Hard Drive Mac?

How to Encrypt & Password Protect Files & Folders on Mac

Connect the drive you want to encrypt to your Mac.
Open Finder and rightclick the drive from the Finder sidebar.
Select Encrypt.
Enter a strong password of your choice, plus a password hint.
Click Encrypt Disk.

How do I Password Protect an External Hard Drive on a Mac Without Erasing It?

You can encrypt your data without erasing it by turning on FileVault in the Security & Privacy pane of System Preferences see Encrypt Mac data with FileVault. You can also encrypt a disk and protect it with a password without erasing it. See Protect your Mac information with encryption.

Can you Put a Password on a External Hard Drive?

You can password protect external hard drives by turning on BitLocker. It is designed to protect data by providing encryption for entire volumes.

How do I Password Protect a Portable Hard Drive?

Download and install an encryption program, such as TrueCrypt, AxCrypt or StorageCrypt.
Plug in your external hard drive to your computer and wait for your computer to detect it.
Open your encryption program and select the option to create a new volume.
Choose the password you want for access to this drive.