Cannot use 8GB SHDC even with SanDisk reader. Low level format or?

I bought a 8GB Micro SDHC card and it formatted fine in my Blackberry 9650. I copied music files to the device from my Windows 7 computer via the USB cable . Afterwards the Blackberry said it detected a problem with the card and would I like to repair. I chose yes, and ever since then I cannot format the card in any device, even a computer using the SanDisk card reader which came with this card. Do you know of a tool to fix this? Perhaps a low level format tool?

Thank you,