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10.3: Skip disk image checksum verification System
Panther uses a centralized diskimages-helper tool for all disk image mounting, but unlike on Jaguar, there is no GUI acessible preference to enable skipping of the checksum verification to speed up mounting. So use the following instead (in Terminal):
 % defaults write com.apple.frameworks.diskimages skip-verify true
This will turn off disk image verification system-wide, regardless of what client has requested the mount (e.g. Finder or Safari or Disk Utility). There are many other interesting preference keys as well as their defaults in /System -> Library -> PrivateFrameworks -> DiskImages.framework -> Resources -> defaults.plist and client specifc defaults in /System -> Library -> PrivateFrameworks -> DiskImages.framework -> Resources -> agent-defaults -> *.plist.
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10.3: Skip disk image checksum verification | 16 comments | Create New Account
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10.3: Skip disk image checksum verification
Authored by: sapporo on Nov 20, '03 11:33:09AM
I wonder what
% defaults write com.apple.frameworks.diskimages burn-apple-supported-devices-only false
would do?

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10.3: Skip disk image checksum verification
Authored by: bostmass on Nov 22, '03 08:50:47AM

You can use this applescript from NoName Scriptware. It also handles licensed disk images and boy is it fast.

http://www.nonamescriptware.com/programs/MountMe.sit



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10.3: Skip disk image checksum verification
Authored by: jfaughnan on Oct 15, '04 12:23:30AM

I just Googled on the string: "defaults write com.apple.frameworks.diskimages burn-apple-supported-devices-only false"

Looks like this question has still not been answered!

Surely someone will try someday and post the results here ...

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--
John Faughnan
jfaughnan@spamcop.net
www.faughnan.com



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10.3: Skip disk image checksum verification
Authored by: cynikal on Nov 20, '03 12:59:10PM

hehehe.. thank goodness for this hint!!!!!! i've been wondering how to skip it automatically since panther did away with disk copy and its preference screen!



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Word of warning
Authored by: stewby on Nov 20, '03 01:34:45PM

If you install important things from Disk Images--especially if you install system updates manually instead of with Software Update--I highly recommend *not* doing this.

I got burned pretty badly by skipping checksums when I installed the 10.2.8 update from what turned out to be a slightly corrupted disk image. The install completed, but it rendered my entire system non-bootable. Only the fact that I had a second bootable partition kept it from being a total nightmare.



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Why???
Authored by: babbage on Nov 20, '03 09:39:21PM

Why would anyone ever want to do this? Checksums are there to protect you. It's a safety mechanism to, in this case, verify the integrity of a disc image before you go making any assumptions & maybe do something destructive. How long does the checksum take -- a few seconds at most? Come on, this isn't a hint, this is an invitation to pain. Don't do this hint -- sooner or later, you'll regret it.

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DO NOT LEAVE IT IS NOT REAL

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Why???
Authored by: Bobson on Nov 20, '03 10:17:42PM

Well, I keep one or two disk images of game CDs on my laptop so I don't need to carry the CDs around with me. When I want to play, I don't want to sit and wait while it checksums.



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Why???
Authored by: raider on Nov 21, '03 12:10:20AM
You could get seriosly hurt if you leave your house - so instead of giving you the option to leave, I'm going to come over and nail your doors shut.

Just because a bad thing could happen doesn't mean people shouldn't have the choice or option of controlling their own computer...

I absolutely NEED this option for my children's computers. See, they play lots of kids games, and EVERY ONE of those games requires the disk in to play. Since that is not feasable for a toddler to manage - I have created disk images of all the disks, and mount them automatically at login. If I can't turn off the verify - it starts failing around disk 6, and can run for an hour before finishing sometimes, with random failures. Once I turn off the verify - they mount perfectly and work fine...

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Why? Takes too long.
Authored by: SeanAhern on Nov 21, '03 01:06:55PM

If the checksum only took a few seconds, I doubt anyone would ever wish to turn it off. However, for large images like CD images, this can take minutes to perform. The only way (previous to learning about this hint) to stop it was to click the "Skip" button. It's precisely the length of time that causes people to want to turn it off.

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-Sean



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BECAUSE!!!
Authored by: cynikal on Nov 20, '03 10:37:47PM

oh quit your whining.. suppose you regularly mount the same image over and over, it's a big waste of time! a couple of seconds? try a matter of minutes! it adds up, you could be using the data on the mounted disk, instead you're watching it verify something you know is working..

why don't you let people make up their own minds? who died and made you king that you feel you have to rain on everyone else's parade crying on a soapbox?! it's one thing to post a polite warning and another to condemn everyone who might not be as patient and lax as you.



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10.3: Skip disk image checksum verification
Authored by: agamorim on Nov 21, '03 06:33:34AM

hi,
when i write:
% defaults write com.apple.frameworks.diskimages skip-verify true
i have in the terminal the massage:
"no such job"

and the preference is not changed!

I have the system in portuguese, but i think is no because it!
any ideas to change that?
Tx



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10.3: Skip disk image checksum verification
Authored by: Dan B on Nov 21, '03 07:45:21AM

You are not supposed to type the percent sign (%), only the text starting with the word defaults.



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10.3: Skip disk image checksum verification
Authored by: ckount on Nov 14, '04 01:27:00PM

skip the % and u should be alright.

am i correct?



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I've been using hdiutil/hdid in Jaguar
Authored by: jecwobble on Nov 21, '03 03:59:20PM
I use this hint. Mounts simple DMG's fast. If there's a DMG with a license agreement, I have to use DiskCopy, though. Has anyone tried this defaults write... hint in Jaguar to see if it work there, too?

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10.3: Skip disk image checksum verification
Authored by: beetle496 on Jun 11, '06 04:05:26AM

Thanks Daniel Steffen! That tip is awesome. I have a couple of small kids that are quite independent with their Macs and I wanted to upgrade one of their systems to OS X. The educational software developers seem to think it is a great idea to have children manipulating discs, despite all the complaints they get from parents and teachers. Anyway I have a bunch of CDROMs mirrored to the hard drive and they all mount on startup. This little tip has to save twenty minutes or more! (P.S., works for Tiger.)



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10.3: Skip disk image checksum verification
Authored by: meltingpot on Jan 30, '12 11:02:23AM

Hi, this worked perfectly. thank you. I have a quick question about it, how do I get it OFF? When I don't feel 100% confident about the source, I'd like to keep the checksum validation running. How can I put this feature back on or turn the command I entered off? Thanks in advance.



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