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MediaKit reports partition (map) too small

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gtr

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May 22, 2019, 3:14:38 PM5/22/19
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OS 10.14.5

I got an archival 2T FireWire drive out, erased it and attempted to
partition it anew, from 2T to 1T in preparaton for SuperDuping to
separate 1T drives to it.

Error: "MediaKit reports partition (map) too small. If you recently
grew your whole-disk, you should run whole-disk repair."

I've since First-Aided it, rebooted in recovery mode and attempted the
partitioning from there; same error.

Any cure appreciated.

David Empson

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May 22, 2019, 4:37:27 PM5/22/19
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What partition map scheme is it using? Most drives default to the
Windows-standard "Master Boot Record" which has a tiny limit on the
number of partitions (4 if I remember right, and there are some hidden
ones).

Erase the drive again, specifying a partition map scheme of "GUID
Partition Map" which has been the standard on Macs since the
introduction of Intel models.

--
David Empson
dem...@actrix.gen.nz

gtr

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May 22, 2019, 4:55:03 PM5/22/19
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On 2019-05-22 20:37:23 +0000, David Empson said:

> gtr <x...@yyy.zzz> wrote:
>
>> OS 10.14.5
>>
>> I got an archival 2T FireWire drive out, erased it and attempted to
>> partition it anew, from 2T to 1T in preparaton for SuperDuping to
>> separate 1T drives to it.
>>
>> Error: "MediaKit reports partition (map) too small. If you recently
>> grew your whole-disk, you should run whole-disk repair."
>>
>> I've since First-Aided it, rebooted in recovery mode and attempted the
>> partitioning from there; same error.
>>
>> Any cure appreciated.
>
> What partition map scheme is it using? Most drives default to the
> Windows-standard "Master Boot Record" which has a tiny limit on the
> number of partitions (4 if I remember right, and there are some hidden
> ones).

I'm unsure what "map scheme" might be. It's current "format" is Mac OS
Extended (Journaled), if that's the same.

> Erase the drive again, specifying a partition map scheme of "GUID
> Partition Map" which has been the standard on Macs since the
> introduction of Intel models.

I'll give it a shot.

gtr

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May 22, 2019, 5:01:41 PM5/22/19
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On 2019-05-22 20:37:23 +0000, David Empson said:

When erasing the drive the only formats provided are:
Mac OS Extended (Journaled)
Mac OS Extended (Case-sensitive, Journaled)
MS-DOS (Fat)
ExFat

That's it. Four options.

gtr

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May 22, 2019, 5:03:15 PM5/22/19
to
On 2019-05-22 20:55:00 +0000, gtr said:

> On 2019-05-22 20:37:23 +0000, David Empson said:
>
>> gtr <x...@yyy.zzz> wrote:
>>
>>> OS 10.14.5
>>>
>>> I got an archival 2T FireWire drive out, erased it and attempted to
>>> partition it anew, from 2T to 1T in preparaton for SuperDuping to
>>> separate 1T drives to it.
>>>
>>> Error: "MediaKit reports partition (map) too small. If you recently
>>> grew your whole-disk, you should run whole-disk repair."
>>>
>>> I've since First-Aided it, rebooted in recovery mode and attempted the
>>> partitioning from there; same error.
>>>
>>> Any cure appreciated.
>>
>> What partition map scheme is it using? Most drives default to the
>> Windows-standard "Master Boot Record" which has a tiny limit on the
>> number of partitions (4 if I remember right, and there are some hidden
>> ones).
>
> I'm unsure what "map scheme" might be. It's current "format" is Mac OS
> Extended (Journaled), if that's the same.

The map scheme is indicated as "Apple Partition Map", but I don't see
an option to change that in the Erase panel nor in the partition panel.

Neill Massello

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May 22, 2019, 5:31:13 PM5/22/19
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gtr <x...@yyy.zzz> wrote:

> When erasing the drive the only formats provided are:
> Mac OS Extended (Journaled)
> Mac OS Extended (Case-sensitive, Journaled)
> MS-DOS (Fat)
> ExFat
>
> That's it. Four options.

In Disk Utility, choose Show All Devices from the View menu. Then select
the *device*, above the indented volume name(s) in the sidebar, and
click the Erase button in the tool bar. Just below the "Format" pop-up
menu, you should see a "Scheme" pop-up menu which is where you choose
"GUID Partition Map".

gtr

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May 22, 2019, 5:43:54 PM5/22/19
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Thanks to both you and David for input! Case closed.

Lewis

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May 23, 2019, 5:39:33 AM5/23/19
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Open Disk Utility

View => Show all devices (⌘-2)

Select the DISK, not the Volume.

Select "Erase"

Choose the GUID partition scheme.

Robert is your father's simian brother.

--
Vampires are [...] by nature as co-operative as sharks. Vampyres are
just the same, the only real difference being that they can't spell
properly. --Carpe Jugulum

gtr

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May 23, 2019, 12:08:51 PM5/23/19
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Is GUID partition always the way to go, instead of Apple Partition Map?
Is that an older or less malleable scheme?

nospam

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May 23, 2019, 12:18:12 PM5/23/19
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In article <qc6gig$fpa$1...@news.albasani.net>, gtr <x...@yyy.zzz> wrote:

>
> Is GUID partition always the way to go, instead of Apple Partition Map?
> Is that an older or less malleable scheme?

apple partition map is older and suitable for powerpc macs.

intel macs should use guid.

gtr

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May 23, 2019, 1:25:00 PM5/23/19
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Good to know.

Lewis

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May 23, 2019, 6:12:12 PM5/23/19
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Yes.

> Is that an older or less malleable scheme?

Yep. APM was introduced with the Macintosh II. It is required to boot
any non-Intel Mac, but otherwise there is no reason to use it and GUID
is better.

--
Two, Four, Six, Eight! Time to Transubstantiate!

gtr

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May 23, 2019, 8:16:12 PM5/23/19
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Great. I have some other older hard drives I'm wiping for backup, and
I might as well change this while I'm at it.

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