[Hampshire] Disk images and virtualisation

Morning all

Can anyone think of a reason why I'm getting disk errors when doing an
install to a virtual machine when using the same install media I don't get
errors doing a standard install (without virtualisation)? It beats me -
but I'm still learning with VirtualBox. I've googled a few variations of
VirtualBox+Slackware but not found anything.

Cheers
Rob