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  1. #1

    Member Since
    Jan 30, 2011
    East Sussex, UK
    2011 21.5" iMac 2.5GHz Core i5
    Formatting an external hdd
    Hi, I've just sold my old windows laptop, but I removed the hard drive to protect my privacy. I've since bought an enclosure to turn it into an external hdd. I haven't plugged it into my mac yet, but wanted to know how to go about formatting it as it's still got the windows vista os and all my old files on it (I don't need to keep them). is the anyway of completely wiping it, so if I were to sell it later, no one would be able to retrieve any of my credit card numbers, passwords etc?

    Many thanks,

  2. #2

    mrplow's Avatar
    Member Since
    Oct 01, 2007
    Mac Mini i5 (2014 High Sierra), iPhone X, Apple Watch, iPad Pro 12.9, AppleTV (4)
    Connect your external disk
    Open Disk Utility
    Click to highlight the external disk in the left hand sidebar
    Click Security Options
    The last option is the most secure
    Click OK
    Now click erase
    You'll be prompted to confirm (check it's the right disk!)

    Please use the reputation system if you think you've been helped - bottom left of this post

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