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  1. #16

    IWT's Avatar
    Member Since
    Jan 23, 2009
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    Born in Scotland, Worked in Scotland then England, Now live in Wales
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    4,065
    Specs:
    Late 2015 5K 27-inch Retina iMac, 4GHz i7, 32GB RAM, 1TB Flash Drive, macOS Sierra 10.12.6
    OK - when you use Disk Utility (DU), it will show all the Disks currently mounted.

    In the example below, you see Apple SD on the top (red arrow) and the indent below it - yellow arrow - in this case called Macintosh HD.

    The top one is the name/manufacturer of the Hard Drive and the indent is the actual space available on that Hard Drive.

    All mounted Hard Drives appear in this way (see my examples of my 2 Time Machine Hard Drives).

    Your External Hard Drive (EHD) will appear in this way too. What I was asking you to do was Click on the top to decide Format and GUID Partition Map. The name can stay as given by the manufacturer.

    S1.jpg

    Then you Click on the indent which is where you give the Hard Drive a name - I suggested Time Machine Backup - and confirm the Format. Then Erase.

    It's really very easy. What you are doing is taking the External Hard Drive made by "Bloggs", using "Erase" to determine the GUID Partition Map by selecting it via the triangles and the Format again by choosing from the triangles.

    Then you go to the indent, and again using "Erase" give the EHD a name, confirm the Format and Erase. Simple.

    Just follow my screenshots as in this post and above.

    Please post back.

    Ian
    Ian

  2. #17

    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, USA
    Posts
    4,158
    Specs:
    L2014 Mac mini macOS 10.13, iPhone 8+ iOS 11, iPad Pro 1 12.9" iOS 11,  Pencil 1
    To view all connected drives, select View, in the Menu Bar, make sure Show All Devices is selected.
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  3. #18


    Member Since
    Feb 24, 2011
    Location
    Los Angeles
    Posts
    451
    @ IWT: Thank you for this very clear and patient explanation.

    Thanks, also, to everyone who responded in this thread.

    I erased the Seagate Drive and performed a new TimeMachine Backup. All appears to be well.

    Garcias.
    MacBook Pro 13" 2017 Four Thunderbolt 3 Ports
    Processor: 3.5 GHz Intel Core i7
    Memory: 16 GB 2133 MHz LPDDR3
    Storage: 1 tb

  4. #19

    IWT's Avatar
    Member Since
    Jan 23, 2009
    Location
    Born in Scotland, Worked in Scotland then England, Now live in Wales
    Posts
    4,065
    Specs:
    Late 2015 5K 27-inch Retina iMac, 4GHz i7, 32GB RAM, 1TB Flash Drive, macOS Sierra 10.12.6
    Bravo, Mark.

    Ian
    Ian

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