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How Long Does It Take To Encrypt an External Drive?

I have a 3TB external drive connected to my Mac. It contains 2.5TB of data. If I use Finder > Encrpyt to encrypt the drive, how long will the encryption take? A few minutes or multiple hours? If it has to somehow read and re-write all the data, my guess is it’ll probably take about 20 hours with a FireWire 800 connection.

Comments: One Response to “How Long Does It Take To Encrypt an External Drive?”

    7 years ago

    I wouldn’t argue with that estimate. If I had to do it, I would at least kick it off before going to bed. But more likely I would kick it off before a weekend or something like that.
    If you decide to go ahead with this, report back and let us know how long it took.

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