Thanks all,
I was able to get the card back to functional again. For future readers, I step thru it.
-Once I remembered to switch to root (doh!),
-I couldn\'t chmod the card, I still kept getting a read-only error. So,
-I umounted, mkfs.vfat\'ed, mounted per brewins direction
-The SD card reponded now, but still failed at all write/read/delete commands.
- I ejected the SD, rebooted the Z, reinstered SD and now it\'s 100% back.
Thanks brewin and responders.