Disk Utility says not enough free space - but there seems to be.

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Level 1

85 points

Disk Utility says not enough free space - but there seems to be.

Following Disk Utility's help menu on burning a disk image to a DVD, I created a disk image (.dmg) from a folder of a movie containing 11 Video TS files - VOB BUP IFO - and Audio TS (nothing in there)
This folder came to 4.32 GB on disk. In Disk Utility, The .dmg shows to be 4.4 GB, and yet when I click the Burn icon and insert a DVD-R 4.7GB disc I get a message stating 'the disc inserted does not have enough free space' ...huh?

I've tried making several disk images, no luck.

Any help appreciated, thanks!

Dual 1.25 GHz MDD/G4, Mac OS X (10.4.11)

Posted on Jan 8, 2010 3:50 PM

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Answer 1

Jan 9, 2010 9:46 AM in response to Keith Rodan

Look at this link. *Media Guides > DVD Disc and Burner Formats*
http://www.digitalfaq.com/guides/media/dvd-formats.htm

Look at the Disc Sizes section. The actual capacity of 4.7GB discs is approximately 4.38GB. This is due to the way DVDs & hard drives are speced.

Probably the easiest way to understand this is to say that your DVD-R capacity really is 4.7GB (Giga Bytes) and that the quanity that the computer displays is actually a different unit of size alltogther called GiB (pronounced Gibi Bytes and meaning Giga-binary Bytes).

Now one GiBi is equal to about 1.074 GB, so if you do the maths (4.7/1.074) you find that 4.38 GiBi and 4.7GB are actually the same thing. The easiest way to think about it is that your computer incorrectly reports GiBi as being GB when they're actually two different things.

You need to remove one or more files from the dmg to get down to about 4GB.

 Cheers, Tom 😉

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Answer 2

Keith Rodan Author

Level 1

85 points

Jan 9, 2010 1:33 PM in response to Texas Mac Man

Thanks Tom,

Looks like you did the homework and the math.

But I wonder which file I can delete to get down to size and still hold on to most of the movie. I can do without the menus, but am not sure which ones those are. It's a little like brain surgery or, hopefully not, trial and error.

cheers,

Keith

PS OK, I'm guessing that the four 1 GB VOB files have to stay. There are 2 VTS files at 55MB and 271 MB. Not sure what they are, but will take a stab and see what the disc looks like without either of them...if it plays at all.

k

PPS Would be great if Apple had added that helpful info in the Help section, right?

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Answer 3

Keith Rodan Author

Level 1

85 points

Jan 9, 2010 6:40 PM in response to Keith Rodan

All the same, doing the above - removing small files to get disc contents around 4GB, then creating .dmg and burning in finder (disk utility) yielded an unplayable disc. Wonder why?

I'm trying to back up a movie in my collection. I know I can use Cinematize, but it takes forever. Is there solution to copying the disc so it can play on computer and tv? If the suggestion is to use Toast, I'd first rather explore a good way to use what's available on this Mac (OS 10.4.11)if at all possible

thanks

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