Unexplained Size Difference With CentOS 7 (1503) -01 Install Media

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In the process of updating my copy of the CentOS 7 (1503) -01 install media, I notice that it’s ~70MB larger than the image that it’s replacing:

$ rsync mirrors.kernel.org::CentOS/7.1.1503/isos/x86_64/*DVD*.iso

-rw-r–r– 4310695936 2015/03/31 17:05:50 CentOS-7-x86_64-DVD-1503-01.iso
-rw-r–r– 4236247040 2015/03/28 12:15:26 CentOS-7-x86_64-DVD-1503.iso

But when I compare sizes using “du” on the mounted ISO files, I can’t see any discernible difference:

Original CentOS 7 (1503) DVD:

$ du -ks /CentOS7/*
1 /CentOS7/CentOS_BuildTag
6148 /CentOS7/EFI
1 /CentOS7/EULA
18 /CentOS7/GPL
79428 /CentOS7/images
73378 /CentOS7/isolinux
281423 /CentOS7/LiveOS
3752743 /CentOS7/Packages
12696 /CentOS7/repodata
2 /CentOS7/RPM-GPG-KEY-CentOS-7
2 /CentOS7/RPM-GPG-KEY-CentOS-Testing-7
3 /CentOS7/TRANS.TBL

Revised CentOS 7 (1503) -01 DVD with CentOS-release fix:

$ du -ks /CentOS7-01/*
1 /CentOS7-01/CentOS_BuildTag
6148 /CentOS7-01/EFI
1 /CentOS7-01/EULA
18 /CentOS7-01/GPL
79428 /CentOS7-01/images
73378 /CentOS7-01/isolinux
281423 /CentOS7-01/LiveOS
3752745 /CentOS7-01/Packages
12696 /CentOS7-01/repodata
2 /CentOS7-01/RPM-GPG-KEY-CentOS-7
2 /CentOS7-01/RPM-GPG-KEY-CentOS-Testing-7
3 /CentOS7-01/TRANS.TBL

Seems like a large delta in ISO size for not much of a change in content. Any ideas?

-Greg

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