site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com --- At Thu, 16 Aug 2007 10:53:50 -0400, Dan Markarian wrote:
Hey Duane,
We do not detect live changes to a partition map in Tiger.
Thanks. Then I am back to my original question. When Disk Utility (diskutil) partitions a drive it takes it off-line then puts it back on- line. Clearly this causes everything to be re-read. I'd like to do the same thing. Disk Arbitration doesn't seem quite the right tool for doing this. In fact even Disk Utility does not fully "eject" a firewire disk unless it is partitioning. I surely don't want to request the user to restart just to re-read changes to a disk. Is there somewhere I should look for how to do this? Another mailing list? Thanks for the help.
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. :-)
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