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  1. #1


    Member Since
    Jul 13, 2009
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    How to format hard Drive to work as an internal and external?
    Hi all, i hope this is possible - What i want to do is Format my 1TB 3.5 HD to work as an internal drive (G5 Tower) and as an external drive (in a USB enclosure).

    The reason is i want to copy large amount of data and it's much quicker when it's internal.

    When i format as an external or internal when i switch it it just says this disk cannot be read.

    Is there a way to do this please??

  2. #2

    mrplow's Avatar
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    27" iMac i7 (2011) 10.11, Mac Mini i5 (2014), iPhone6s, Apple Watch, iPad Pro 9.7, AppleTV (4)
    When i format as an external or internal when i switch it it just says this disk cannot be read
    How are you formatting the disk and to which file format?

    What is giving you the error 'disk cannot be read'?
    Not been around these parts for a while. Trying to change that . .

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

  3. #3


    Member Since
    Jul 13, 2009
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    Hi,

    I am formatting the disk via disk utility - Mac OS extended (Journaled) - GUID Partition Table.

    I have done this when it's in the tower and works in the tower fine - put this into an external USB caddy and i get the "Disk cannot be read"

    Also do the same format from the Caddy and i get the same message when i insert the drive into the tower.

    Thanks

  4. #4

    mrplow's Avatar
    Member Since
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    27" iMac i7 (2011) 10.11, Mac Mini i5 (2014), iPhone6s, Apple Watch, iPad Pro 9.7, AppleTV (4)
    You don't say what gives you the "Disk cannot be read" error, so I'm going to guess you have two HDD? One with Mac OS on and this one you remove and it's your G5 that's reporting the error not another machine?

    If this is correct I'd say your caddy is faulty.
    Not been around these parts for a while. Trying to change that . .

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

  5. #5


    Member Since
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    Yes, sorry it's not he boot HD - It's a spare one.

    If the caddy is faulty, how can i format the same HD in the caddy and it works fine?

  6. #6

    mrplow's Avatar
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    27" iMac i7 (2011) 10.11, Mac Mini i5 (2014), iPhone6s, Apple Watch, iPad Pro 9.7, AppleTV (4)
    Faulty doesn't mean it's failed entirely, but the fact is everytime you make chnages to the drive in the caddy you're getting issues.

    Do you have another you could try it in?
    Not been around these parts for a while. Trying to change that . .

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

  7. #7


    Member Since
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    I'll try and get my hands on another one and test!

  8. #8

    harryb2448's Avatar
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    You need to set up the drive Apple Partition Map as GUID is only for Intel machines.

    Your G5 has two positions for a hard drive and it will always transfer much quicker installed than using Firewire, USB etc. Just set the jumpers to slave and away you go.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  9. #9


    Member Since
    Jul 13, 2009
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    Ok, thanks, i'll try that.

    So in theroey once i format/partition in the Apple Partition Map, then i should be able to swap between my USB enclouser and my G5 Tower?

  10. #10

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
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    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Subject to changing the jumper settings each and every time.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  11. #11


    Member Since
    Jul 13, 2009
    Posts
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    Thanks for the help!

    Turned out the G5 was on leopard and Laptop on Snow Leopard - after upgrading the G5 it woeks flawlessly!

    Thanks for the help! Much appreciated!

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