I have a 16gb SDHC card, a Transcend brand one, also from Newegg. The exact same thing happened to me today on my Mini 9 running Type11 7.7. I couldn't repartition it in OSX, either in the built-in reader or in a usb reader. As a last shot I booted from a thumbdrive with ubuntu linux and it WAS able to partition and format the card. I rebooted back to OSX and formatted it GUID and all seems well now.
Last week the same thing happened to me on the
SSD drive and I had to use the XP installer disks to partition it. Could it be that there is an issue with Type11 installs corrupting flash media in a way that OSX can't recover from or even repartition. I hope not, but if there are others out there seeing this please speak up so we can identify it.