Disk Utility: Different burn rates when burning DVDs

Hi Folks,
When I burn DVDs from a disk-image using Disk Utility it displays a message showing the maximum burn rate.
Using the same image, same machine and same batch of DVDs the message displayed varies from a 2x to 8x burn rate.
Any idea why ? Is it the burner, the utility, the DVD ... ???
Thanks in advance
Pat De Marco

Hi Pat,
Are you perhaps speaking of the variance over the breadth of a a single disc?
They burn slower on the inner tracks than the outer tracks due to higher surface speed on the outer tracks at the same RPM.
Burners are also made to adjust burning speed to match the capability of the Media... no two are identical, though higher end ones will be closer to each other.

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Hi all,
I'm having similar issues on a white macbook (2006 model). I ran into some trouble with it about a month ago, when on booting up, it showed only the folder with a question mark. Booting up from the original grey install DVD worked, so I thought the problem was most likely a faulty hard drive.
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http://www.apple.com/support/macbook/hd/repairextension/
Doh! Too late?
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https://discussions.apple.com/message/16090313#16090313
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That means the drive needs to be repartitioned if it's still functional. See:
Drive Preparation
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
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Hi Sagar,
In tcode OBBS, if Alt.exchange rate is used for any currency pair, then that rate is used ( EURX in this case).
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Disk Utility hangs ("not responding") when attempting to Repair Disk on Time Capsule sparsebundle. Help.

I am trying to improve the performance of my Time Machine backup and retrievals via my 2nd Gen. Time Capsule from my iMac Core 2 Duo hard drive with SL 10.6.8. The incremental backups generally take 20 - 40 minutes each hour generally with fewer than 100 MB of data being backed up. I have read through numerous threads on these forums about Time Capsule and Time Machine issues as well as the very helpful Pondini site (http://web.me.com/pondini/Time_Machine/Home.html) and have tried many other suggestions (listed below), but have been unable to attempt a Disk Utility repair disk on the Time Capsule sparsebundle file.
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Also note that on my new Macbook Air, Time Machine runs quite quickly via this same Time Capsule from my new Macbook Air using OS X Lion (which seems to indicate that the Time Capsule drive itself is OK).
I would appreciate any tips on getting Disk Utility to run "repair disk" on my sparsebundle, as I seem to have exhausted most other options (see below) for improving Time Capsule performance -- aside of course, from wiping the Time Capsule clean and starting all over.... (which I really don't want to do, and from what I've read, has not helped some people who've tried this anyway).
Many thanks!
Although I would like to focus this thread on the Disk Utility / sparsebundle "Repair Disk" problem, I should mention that I have tried the following other things:
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2. Used Disk Utility to run "repair disk" on my hard drive after starting up from a SuperDuper external backup
3. Run DiskWarrior on my hard drive, again, from a separate startup disk
4. Did the "full reset of Time Machine", a la Pondini Troubleshooting #A4
5. Changed my computer and Time Capsule names to simple short names with only alphanumeric characters and no spaces
6. Ensured that my Time Capsule is being accessed only via ethernet
7. Relaunched the finder
8. And finally, attempting to use Disk Utility to repair the sparsebundle - thus the nature of this post

OK, no takers out there, but I answered my own question (sort of).
The answer is that even though Disk Utility shows up as "not responding" under the Force Quit menu and appears to hang, it is actually still working. A bit of patience shows that after about an hour, my Disk Utility was able to show the 1.44 TB Time Machine sparsebundle from Time Capsule in the disk window on the left hand side. Once this appeared, I was able to click on "Repair Disk" (note that prior to doing this, I had to "Disconnect All Users" from my Time Capsule using the Airport Utility program; otherwise you will get a "could not unmount disk" error). Again, the Repair Disk function appeared to hang Disk Utility as it showed up as "not responding" under the Force Quit menu. However, after about 8 hours, Disk Utility did run the entire Repair Disk protocol on the sparsebundle. The results DO NOT show up in the Disk Utility details window - so even if you are patient enough to let it complete, you will not see anything and may think that nothing happened. However, you can find the familiar results of the Repair Disk function by looking on Console - find the "DiskUtility.log" under Files: ˜/Library/Logs.
Unfortunately, I was hoping to find a problem that would have been subsequently repaired which would result in dramatically increased Time Capsule speed, but this was not the case. Disk Utility showed everything to be "OK" and I am stuck with a very slow Time Capsule....
(And of note, my new Macbook Air (OS Lion) Time Machine functions blazingly fast on both backup and retrieval to and from the very same Time Capsule - even though, these are occuring wirelessly via AirPort -- granted the size of this sparsebundle is an order of magnitude smaller at this point, i.e., only 10 GB right now)
Would still be happy to hear of any similar experiences or tips on getting Time Capsule to work more quickly.

Disk Utility doesn't run from installation dvd.....

hi there:)
i ran a scheduled maintenance check using Onyx. It turned out that the disk could not be verified and it had to be fixed by inserting the installation dvd and running 'disk utility'. i inserted the dvd and ran the 'disk utility', however, it quit unexpectedly. the following message came up:
Process: Disk Utility [417]
Path: /Volumes/Mac OS X Install Disc 1/Applications/Utilities/Disk Utility.app/Contents/MacOS/Disk Utility
Identifier: com.apple.DiskUtility
Version: 10.5.8 (198.16)
Build Info: DiskUtility-1981600~17
Code Type: X86 (Native)
Parent Process: launchd [172]
Date/Time: 2008-12-28 12:28:49.499 +0000
OS Version: Mac OS X 10.5.6 (9G55)
Report Version: 6
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0
Dyld Error Message:
Symbol not found: __commpagedsmos
Referenced from: /Volumes/Mac OS X Install Disc 1/Applications/Utilities/Disk Utility.app/Contents/MacOS/Disk Utility
Expected in: /usr/lib/libSystem.B.dylib
i really want to know what to do to save my mac book!
please help
regards,
rik

Rik,
Please reread my first post carefully & make sure you follow its instructions closely. The "Repair Disk" step (not the verify one) should be run while your Mac is started up from the install disk, then the "Repair Permissions" step should be run after you have restarted normally.
Some background info that may be helpful:
Disk Utility (& all such disk utilities) must temporarily "unmount" a disk to affect a repair of its file system (which is what the "Repair Disk" step does). Unmounting a disk makes it unavailable for normal use. The disk containing the operating system that is currently running the computer (the startup disk) cannot be unmounted. This is why the "Repair Disk" button is grayed out if you run Disk Utility with your startup disk as its target.
Repairing permissions does not require unmounting the disk but it does require a healthy file system, which is why the disk repair must precede it. Apple recommends repairing permissions on the start up disk while booted from it, which is why it should be done after restarting normally.
The verify steps do not actually repair anything. They just run the checks that the repair steps run to determine if any repairs are needed & report the results of those checks.
The routine that repairs permissions is part of the OS itself. Disk Utility, Onyx, & all other such utilities that repair permissions actually just tell the OS to perform this routine. Thus, it doesn't matter which one you use to do this repair, nor is one utility any better than another at doing this. So if you prefer, after restarting after doing the disk repair from the install disk you can do the permissions repair with Onyx.

Disk Utility says "no options" when I try to partition

Hi,
I have a flat-screen IMac G4. I want to partition the hard drive. When I open disk utility and click on the drive I want to partition, I get the partition tab, but everything is grayed out and it says "no options." Can anyone tell me how to proceed to partition? I want to restore another, smaller hard drive on the IMac, hopefully without erasing everything. This would be sort of an archive of the hard drive that's already on the IMac. It's old stuff that is not currently in use.
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You have to boot using your install disc. See http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh14.html
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Disk Utility: Different burn rates when burning DVDs

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