How to encrypt a external hard drive?

Magic25 Said:

"How to encrypt a external hard drive?: This are the options:"

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Use Disk Utility:

Try this Link: Encrypt and protect a storage device with a password in Disk Utility on Mac - Apple Support

Alos...

Compress these:

If you were to compress these into a ZIP file, you could encrypt it, and then when someone wants to access them, they would be prompted to enter a password.

Magic25 Said:

"I am aware of using Disk Utility where you have to erase first all the data from the HD, and I wanted to avoid that. The zip option is intersant but not practical for my use. I probably will explore the use of a free Encryption software for Mac to do the job or last option buying a new external HD."

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Contact Seagate:

One last thought is to contact Seagate, seeing what they have to say on this:

• Seagate Contact Info: https://www.seagate.com/contacts/
• Seagate Forums: http://forums.seagate.com

Magic25 Said:

"How to encrypt a external hard drive?: I did open a new Finder window, right clicked on the External Drive (Seagate) but encryption option wasn't listed. Is there any way to encrypt without erasing and re-formatting the external hard drive? Mojave 10.4.6 is installed on my Mack. Thanks, _Mark"

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So, right clicking on it, you don't see something like this?:

BTW: Mojave is 10.14 or 10.4

You are welcome.