Re: finding the offset of a partition

Subject: Re: finding the offset of a partition

From: Jason Bobier <email@hidden>

Date: Fri, 3 Feb 2006 11:05:39 -0800

Delivered-to: email@hidden

OK, thx. I actually do have a filter scheme on the stack so I could just ask it to find the base of the IOMedia partition below it. Hmm... Actually, I can pass DKIOCGETBASE to the rdisk and it works.

That ioctl is only listed in the kernel framework for some reason but works from userland.

Jason

Jason Bobier email@hidden

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On Feb 3, 2006, at 1:25 AM, Alexander von Below wrote:

Am 03.02.2006 um 07:49 schrieb Jason Bobier:

I can't seem to find a way to find the offset of a partition on a drive without reading the partition table myself. Is there an easy way to do this?

i.e. given disk1s1 what is it's offset from the beginning of disk1?

No, as Justin already suspected nothing inside a partition tells you anything about the location of that partition on the disk. And it would not make much sense either, as partitions are meant to be self-contained and portable. For example, you can easily copy a partition into a disk image without modifying anything within the partition.

Bottom line: You have to get access to the partition map.

Alex

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References:

>finding the offset of a partition (From: Jason Bobier <email@hidden>)

>Re: finding the offset of a partition (From: Alexander von Below <email@hidden>)