Comment 7 for bug 940339

A quick look at the logs shows that the errors are from mkfs for most of the cards. For the Sandisk 4Gb card it's mv that complains that it's a read-only fs.

Can you try other filesystems on the failing cards to see if it's ext4 that's the cause of the problems? Perhaps find some flags to mkfs that works for partitioning the cards?

At least it's very likely that the workaround for this is to create images and dd them to the cards. Unless ext4 really is a bad idea.