[Q] MicroSD External Media in Unknown State

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Alright guys I need some help... my Thunderbolt keeps saying my sd card is blank and needs to be formatted then it says external media is in an unknown state. I've seen that this has been an issue with past HTC phones but none of the solutions have worked. I have a 16GB Class 4 Sandisk and an 8 GB Class 6 Transcend. They both work on my Win7 PCs and on my old LG Ally Android.

I've tried reformatting them with the Ally, with Windows, with GParted. I've tried changing ROMs (originally had Skyraider Zeus before the issue started) then tried CM7 RC1.

Currently in the process of going back to stock unrooted in case I need to send it back for warranty repair/replacement. Although this is difficulty because it requires a recognizable micro sd. Hboot and Clockwork Recovery only recognize the card about 5% of the time and it seems to be based on luck.

Any suggestions on what the issue is or how to fix it?

Sorted

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So I've had (give or take a few minor details) exactly the same problem as you. I hope by now you've sorted it, but just in case you haven't and for others like me looking for the answer, this is what I've found and it's worked me and several others.
Its just a matter of removing the battery! simple, but even though the phone is off you still need to remove the battery and the card. Then insert the card then insert the battery. Its worked for both my cards that previously gave the message.
Hope this helps

The Solution

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bucklandnick, perfect thanks!! Tried two SD cards with same results. Simple and does the job!

Be wary of that, if it starts happening frequently, you're going to have to have the phone replaced. My last Bolt started spontaneously saying the card was ejected, and refusing to remount it. Pull battery and card, replace, boot up, reads for a few then ejects. A few times I had to remove it, boot up, shut down, reinsert card, boot up again. it ended up corrupting my card and I damn near lost everything on it. If it happens more than a few times, contact VZW ASAP about getting a replacement, and back that sucker up!