Re: Creating dmg on 10.5 and 10.6
Re: Creating dmg on 10.5 and 10.6
- Subject: Re: Creating dmg on 10.5 and 10.6
- From: Stéphane Sudre <email@hidden>
- Date: Fri, 4 Jun 2010 15:24:49 +0200
On 10-06-04, at 15:08, Rakesh Singhal wrote:
Hi all,
I am creating one image using following command on 10.6 intel:
hdiutil create -layout SPUD -megabytes 600 -fs HFS+ -volname myimage
myimage.dmg
then I mount it using
hdiutil attach -quiet -owners on myimage.dmg
Now I copy my data to mounted volume (/Volumes/myimage). The size of
my data is around 950 MB and I am able to copy the complete data in
this image. Finally I unmount it using
hdiutil detach -quiet /Volumes/myimage -force
I checked the size of image in finder and it is 629.1 MB.
If I follow the same procedure on same machine but on 10.5.x, it is
not able to copy the same data (950 MB). I need to create image of
around 1000 MB to copy this data. I am running all these commands in
a script.
I would like to know what is the difference in 10.5 and 10.6 in
creating image using same command. Does it compress the data in 10.6
or some layout difference?
Do I need to modify command in 10.5 to get same result as in 10.6,
if it is possible?
Please let me know if I am wrong somewhere.
Based on experience, depending on the OS version, when you create a 10
MB disk image with Disk Utility, you can either get 50 KB of available
space or 9.something MB. This has been addressed in the latest Snow
Leopard version IIRC.
This was due to the default FileSystem settings.
Check -fsargs to see if using some additional arguments could help on
your version of Mac OS X 10.5.
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