RE: Running Acronis on MacBook Pro w/Windows
RE: Running Acronis on MacBook Pro w/Windows
- Subject: RE: Running Acronis on MacBook Pro w/Windows
- From: "Eddy Quicksall" <email@hidden>
- Date: Sun, 4 May 2008 08:54:22 -0400
Thanks for the detailed explanation. Below you say "Apple has added the
ability to boot from an MBR into the firmware in order to support booting
Windows".
Does this mean I could use the Windows install CD and totally reformat the
drive to use the legacy MBR and (of course) be able to boot to Windows
without bootcamp?
Eddy
-----Original Message-----
From: Duane Murphy [mailto:email@hidden]
Sent: Sunday, May 04, 2008 12:14 AM
To: Eddy Quicksall; email@hidden
Subject: Re: Running Acronis on MacBook Pro w/Windows
--- At Sat, 3 May 2008 15:05:09 -0400, Eddy Quicksall wrote:
>Duane, Intel Macs do not use the legacy Master Boot Record, they use the
>GUID Parition Table scheme. EFI uses GPT where BIOS uses a Master Boot
>Record (MBR).
>
>Acronis's problem is that it does not support the GUID partition format.
I'll correct you again. While, the disk is indeed a GPT disk, a GPT disk
includes an MBR at the beginning of the disk called the Protective MBR.
In order for Boot Camp to operate, a real MBR is put in it's place that
maps the partitions in the MBR to the same partitions as the GPT. This
is indeed how Windows with Boot Camp is able to boot.
In order to see what I mean try these commands from the Terminal
gpt -r show disk0
gpt will complain about the MBR being suspicious because it does not
look like a protective MBR.
fdisk disk0
You will see a print out of the MBR mapping the first two partitions to
exact same partitions as the GPT partitions reflected by the gpt command.
Apple has added the ability to boot from an MBR into the firmware in
order to support booting Windows. If I recall correctly, this is not a
feature of EFI, but something that Apple added to the firmware.
While I can't help you with Acronis, the problem is not a missing MBR.
If Acronis is smart enough to notice that the disk is also a GPT and
then failing there's not much that can be done about that.
Sorry I can't be more help,
...Duane
>
>-----Original Message-----
>From: Duane Murphy [mailto:email@hidden]
>Sent: Saturday, May 03, 2008 1:25 PM
>To: Eddy Quicksall; email@hidden
>Subject: Re: Running Acronis on MacBook Pro w/Windows
>
>--- At Sat, 3 May 2008 08:20:03 -0400, Eddy Quicksall wrote:
>
>>The Acronis backup program will not run on a MacBook Pro which is
>>running Windows. I believe the problem is due to the fact that Bootcamp
>>does not use the legacy Master Boot Record.
>
>That would be an incorrect supposition. Boot Camp works specifically
>because the MBR is used to boot into Windows.
...Duane
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