Format external HD with GUID to enable eDrive

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Level 1

5 points

Format external HD with GUID to enable eDrive

New external (LaCie 2T) HD is formatted w/ OS Extended (Journaled). Error message when I try to create an eDrive reads: "The seclected drive is using the Master Boot Record partition scheme. It should be Apple Partition Map or GUID to create an eDrive." I do not understand how to create an Apple Partition Map or GUID; Disk Utility doesn't seem to speak to me about this. The bizarre thing is that this is the identical model of HD - albeit newer by 3 yrs. - that replaces the full one. I am running OSX 10.8.2. Would very much appreciate how-to help...

iMac, OS X Mountain Lion (10.8.2), LaCie 2T External HD

Posted on Feb 23, 2013 11:12 AM

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Answer 1

Eric Ross

Level 6

11,807 points

Feb 23, 2013 11:15 AM in response to clickdc

Take a look at this link, https://discussions.apple.com/thread/4833957?answerId=21331131022#21331131022&ac_cid=tw123456#21331131

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Answer 2

Feb 23, 2013 11:15 AM in response to clickdc

Try http://support.apple.com/kb/HT1557

Allan

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Answer 3

clickdc Author

Level 1

5 points

Feb 23, 2013 12:47 PM in response to Allan Eckert

Thank you for your suggestion. If I read the hardware overview correctly for my iMac8,1, there is no firmware upgrade shown. Any other thoughts? I have now reformatted it again; still no change, will not accept eDrive.

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Answer 4

clickdc Author

Level 1

5 points

Feb 23, 2013 12:48 PM in response to Eric Ross

Eric, Would you please check link and resend. I think this one applies to iPad issues not related here.

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Answer 5

MichelPM

Level 10

80,968 points

Feb 23, 2013 1:03 PM in response to clickdc

This maybe simpler than what every one else is referencing?

In OS X Disk Utility, there should be a formatting tab and a partitioning tab.

You need to create more than one partition for the eDrive.

I Do not believe you can have the eDrive as the master partition.

You need to create, at least two partitions and have the eDrive be one of the other sub partitions.

You need to erase the drive, set up the OS X HFS+ extended format (journaled) there should be a check box for setting the partition scheme to GUID. There should be partitioning tab that allows you to partition or segment the drive into discrete areas of different data storage sizes.

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Answer 6

clickdc Author

Level 1

5 points

Feb 23, 2013 1:48 PM in response to MichelPM

Thanks for replying. How can I find the OS X HFS+ extended format (journaled) if my OS X Disk Utility offers only RAID formats Mac OS Extended (Journaled), Mac OS Extended (Case-sensitive, Journaled and MS DOS (FAT)?

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Answer 7

clickdc Author

Level 1

5 points

Feb 23, 2013 1:50 PM in response to MichelPM

I also meant to add that I am using Tech Tools Pro 6 to create the eDrive.

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Answer 8

MichelPM

Level 10

80,968 points

Feb 23, 2013 1:52 PM in response to clickdc

Mac OS Extended (journaled) is Apple HFS+ Extended format ( journaled). I guess in OS X 10.8 the removed the HFS+ part of the description.

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Answer 9

MichelPM

Level 10

80,968 points

Feb 23, 2013 1:57 PM in response to clickdc

I figured it was the TechTool eDrive.

It cannot be placed of the first ( master partition),

I believe it has to be setup on a lower partition meaning that you need to create, at least, two partitions and install the eDrive on any partition below the first main partition.

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Answer 10

Eric Ross

Level 6

11,807 points

Feb 23, 2013 2:44 PM in response to clickdc

Okay first you need to make sure that your external hard drive is GUID partition, if it is not them follow these instructions, http://support.apple.com/kb/ts1600 Then take a look at the TechTool instructions, http://www.micromat.com/techtool-pro-6-manual/techtool-pro-6-manual-tools#eDrive