On Jan 22, 2010, at 11:35 AM, Cliff Rediger wrote:
I'm creating a DVD in iDVD and see that DiscUtilities provides a
"DVD/CD Master" option. That sounds like just what I want.
That option produces a .cdr file.
.cdr apparently has something to do with Correl Draw ?
No. .cdr is the file extension ALSO used by Corel Draw but in this
case it stands for 'Compact Disc Recording' and is the master file you
would send, for example, to a CD pressing plant to have them press
disks from your master.
Anyway, I'm wondering if anyone could comment on the comparison
between these three file formats: .cdr .dmg. .img ?
.cdr is as above, a standard CD or DVD image for production purposes.
.dmg is Apple's disk image format, which has a wide range of options:
read-only, read-write, sparse image, encrypted, etc etc. It's not
readable on Windows systems without utilities like MacDrive.
.img is interchangeable with .iso which, as the name implies, is an
ISO standard optical disk image format; I believe .img is in wide
usage from some Windows software. This is the most widely used image
format, but it is restricted to ISO-9660 file systems. (and some
extensions therof, like Joliet)
<http://en.wikipedia.org/wiki/ISO_image>
Disk Utility can work with and produce all three, which you use is
determined by your eventual output needs.
--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group
Institutions do not have opinions, merely customs
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