Re: finding the offset of a partition
Re: finding the offset of a partition
- Subject: Re: finding the offset of a partition
- From: Rick Sulack <email@hidden>
- Date: Fri, 3 Feb 2006 11:22:23 -0800
On Feb 3, 2006, at 8:40 AM, Jason Bobier wrote:
In the driver, the disk and the partition are represented by
IOMedia objects and you can use getBase on the partition to know
where it is relative to the disk. So the system knows how the two
are related.
I'm trying to get the offset on disk of a particular file. In order
to do this I use F_LOG2PHYS which gives me the offset from the
beginning of the partition. So I need to add the partition offset
somehow.
IMHO, this is bad idea. What happens if the file turns out to be on
striped RAID volume?
Also, there are many different types of partitioning schemes that Mac
OS X supports, but I don't believe there is any API that you could
use for generically finding the start of a partition on each one. I
only see sizes in the IO Registry for partitions.
I think you are better off using the offset from the start of the
partition.
-rick
Thanx,
Jason
--
Jason Bobier email@hidden
Space Cowboy http://www.prismatix.com/
It's hard to pull yourself up by your bootstraps if your feet are
bare.
On Feb 2, 2006, at 11:28 PM, Justin C. Walker wrote:
On Feb 2, 2006, at 22:49 , Jason Bobier wrote:
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?
AFAIK, there is nothing intrinsic about partitions. It's the
partition table that defines them. That's what the system uses to
find them, when partitions on a disk are mounted. Why do you
think it's otherwise possible?
Regards,
Justin
--
Justin C. Walker, Curmudgeon-At-Large
Institute for the Absorption of Federal Funds
--------
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rick sulack
darwin core os group
apple computer, inc
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"More computing sins are committed in the name of efficiency (without
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