I had to install several CentOS 6 virtual machines via the minimal installation image in the last few months and for some reason, I ran into a slightly weird problem during the installations.

The assistant wants you to check the installation medium of CentOS. Doesn't sound that bad and it is focused by default, so I thought there no need to eschew this. Unfortunately as soon as you do the media check and try to continue with the installation, the following error message appears:

CentOS media check error

There is an easy workaround for this, just skip the media check and the installation wizard should continue the installation like as planned.

CentOS media check solution

This problem/bug exists since CentOS 5 and also in several RHEL releases.