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'[TECH] Can a Windows PC Read a drive with a GUID P'
2011\02\01@143543 by Josh Koffman

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Hi all. I have an external portable hard drive that I'd like to setup
two partitions on. One will be used backup a Mac computer using a disk
cloner. The other partition will be for general storage and exchange
with Windows based computers. If I set it up so that the drive uses a
GUID Partition Map (instead of Master Boot Record), then a Mac based
computer would actually be able to boot off the clone partition. If I
use MBR, then that isn't possible. What I'm not sure about is if a
Windows based computer would be able to see a FAT partition if it
exists on a GUID drive.

Any thoughts?

Thanks!

Josh
-- A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
        -Douglas Adams

2011\02\01@150120 by Nathan Nottingham

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On Feb 1, 2011, at 12:35 PM, Josh Koffman wrote:

> Hi all. I have an external portable hard drive that I'd like to setup
> two partitions on. One will be used backup a Mac computer using a disk
> cloner. The other partition will be for general storage and exchange
> with Windows based computers. If I set it up so that the drive uses a
> GUID Partition Map (instead of Master Boot Record), then a Mac based
> computer would actually be able to boot off the clone partition. If I
> use MBR, then that isn't possible. What I'm not sure about is if a
> Windows based computer would be able to see a FAT partition if it
> exists on a GUID drive.
>
> Any thoughts?
>
> Thanks!
>
> Josh

http://en.wikipedia.org/wiki/GUID_Partition_Table#OS_support_of_GPT

http://refit.sourceforge.net/myths/

In short, you need a MBR for viable Win32 compatibility.  Your Mac will gladly boot from a MBR, however, so sticking with MBR won't hurt.  The OS X installer just refuses to install on a drive without GPT.

- Nate

2011\02\01@154015 by Josh Koffman

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On Tue, Feb 1, 2011 at 3:01 PM, Nathan Nottingham
<spam_OUTkphlightTakeThisOuTspamnottingham-tech.com> wrote:
> http://en.wikipedia.org/wiki/GUID_Partition_Table#OS_support_of_GPT
>
> http://refit.sourceforge.net/myths/
>
> In short, you need a MBR for viable Win32 compatibility.  Your Mac will gladly boot from a MBR, however, so sticking with MBR won't hurt.  The OS X installer just refuses to install on a drive without GPT.


Interesting. I'm using "Carbon Copy Cloner" on the Mac to do the
cloning, it flagged the drive as being a potential problem as a boot
source for OS X.

Thanks for the info!

Josh
-- A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
        -Douglas Adams

2011\02\02@132927 by Alan Melia

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ALL GPT formatted drives have a "Protected MBR" defined to prevent
incompatible OS's from trying to write to them.
The following might help with any other questions.

http://www.microsoft.com/whdc/device/storage/GPT_FAQ.mspx



Alan Melia
t: 0118 977 4963
m: 0781 771 0060
w: http://www.melmac.co.uk


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