jgdsl I found it in another forum maybe help you:
1. First, remove the card/drive from your computer.
Download the low level format tool below to your computer.
http://hddguru.com/download/software/HDDGU...p.2.36.1181.exe
Install the program into your computer. You should see a new icon called "Hard Disk Low Level Format Tool".
a. Insert the card/drive and run the program.
IMPORTANT!!! MAKE SURE YOU SELECT THE CORRECT DISK OR YOUR COMPUTER MAY NOT START LATER!!!
It should shows as BUS: USB. Select the BUS: USB. Also check the size and make sure.
If you don't see BUS: USB, that means the card is unreadable and need to be replaced. In this case, please STOP here and close the program and DO NOT continue below.
b. Then click Continue->Low Level Format->Format this Device.
c. Wait for a few minutes until it finish successfully with a message of asking you to partition and format it. (if you see formatting error, you can stop the formatting and the card needs to be replaced.)
d. Put the card back to your device and see.
2. Please go to the site below:
http://www.sdcard.org/about/downloads/
Please try to download the software sdfv2000.exe (for windows only) and the manual for your reference.
Install the sdfv2000.exe in your computer, then insert the card into the card reader (if you do not have reader, you can try to connect your device to the computer with USB cable) and then run it:
a. Check the drive letter and also the size and make sure it is the correct card.
b. Click Option:
Format Type: Full Erase ON
Format Size Adjustment: ON
c. Click OK, then click Format. Wait until it finish.
d. You will be prompted to remove the card after it finish. Then go ahead and insert it in your device and see.
Greets!