Hi,
I found when I was following the partitioning part of the install guide that cfdisk/mkfs had corrupted the new partition, making it error with I/O errors.
What I did is run fsck /dev/hda1 (where hda1 is your storage device) and pressed y on all the "Fix error?" prompts.
Install could be resumed like there was no hiccup at all.
Hope this helps someone!
Cheers!