Iso file size incorrect

**captainKrash** · May 15th, 2012

Hi there,

I have just installed 64 bit ubuntu desktop (12.04) and have subsequently downloaded the 32bit desktop iso for a friend. When the firefox download dialogue completes it shows file size of 701mb, however, the size on disk appears to be 735.4 MB (735,358,976 bytes) which will not fit on a standard CD.

Is there anything I am doing wrong or anything that I can do?

Thanks

**Zvlwab** · May 15th, 2012

Firefox shows the filesize in MegaBytes (MB).
that can be calculated using the following formula:
735358976 / (2 ^ 10) = 701.29296875 MB

But Nautilus shows the filesize in MebiBytes (MiB).
This can be calculated using the formula:
735358976 / (1000 * 2) = 735.358976 MiB

So you're not doing anything wrong. You can't do anything but use another cd.
It seems the difference is just there to annoy people like you and me.

**captainKrash** · May 15th, 2012

Ah ha. That explains it - thank you for taking the time, appreciated.

The fact that Brasero crashed was what got me flustered and concerned! I'll try burning another CD and see what happens.

**sudodus** · May 15th, 2012

... or if the iso file is really oversized, burn a DVD (if your optical drive can manage that) or make a USB boot drive with Unetbootin or USB Disk Creator.

**jmore9** · May 15th, 2012

Most of the new iso's are over 700 but almost all fit on a cdr not a cdrw. I always get the dvd version now because i only buy blank dvds no blank cds anymore. Anything to small to fit on dvd will wait until enough gathered for full dvd or just make a iso and keep on hard drive.

**cortman** · May 15th, 2012

Check the md5sum of the iso before you burn it too, to ascertain its integrity. Info on that here.

**captainKrash** · May 15th, 2012

Originally Posted by cortman

Check the md5sum of the iso before you burn it too, to ascertain its integrity. Info on that here.

I would if the md5sums were easy to find on the ubuntu website - I have search around the download area perhaps I am a bit blind?

CD burned successfully on second attempt, can only surmise that perhaps the machine was a bit overladen at the time.