Re: Rereading A Partition Table
Re: Rereading A Partition Table
- Subject: Re: Rereading A Partition Table
- From: Dan Markarian <email@hidden>
- Date: Thu, 16 Aug 2007 10:53:50 -0400
Hey Duane,
We do not detect live changes to a partition map in Tiger.
Dan
On 15 Aug 2007, at 9:58 PM, Duane Murphy wrote:
--- At Wed, 15 Aug 2007 17:26:42 -0700, Chris Sarcone wrote:
Duane --
I'm making changes to GUID partition disks partition table, and I
would
like the system to re-read the disk in order to recognize new
partitions
on the disk.
What do I need to do to get the system to re-read the disk and
recognize
the changes?
I've tried several disk util commands (unmountDisk, mountDisk, and
eject) but they don't re-read the disk.
Disk Utility->Eject does the same thing (ie nothing).
I note that this is a FireWire drive, but it could also be an
internal
drive or any other non-network drive.
For example, when Disk Utility partitions a disk, it fully unmounts
and
then remounts the disk. How can I do the same thing?
Try opening and closing the raw disk node for the whole device.
Hi Chris,
That's what I was told. In fact, I am editing the partition table
using /
dev/rdisk1
(or whatever number). But when it is closed it doesn't do anything.
Here's how I open. inDisk is "/dev/rdisk1" (for example);
int diskDescriptor
= open( inDisk, O_RDWR | O_SHLOCK, S_IRUSR | S_IWUSR | S_IRGRP );
later I just
close( diskDescriptor );
There's no errors and in fact, the disk is nicely edited. If I unplug
the drive and plug it back in the partitions looks exactly like what I
want, but it's hard to do that for internal disks. :-)
...Duane
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