It's apparent most people don't have a clue how to get around the "Disk Write Protect" error.
I can help. What is not the problem, is the position of the switch entirely. With the SD card Face up and the tiny white plastic switch on the left side, should be slid toward the card edge connector (the shortest side). I know you may have done this and it still doesn't work. Here's why, On the opposite side of the SD card from the switch, there is a tiny "Notch" cut out.
Place a piece of tape, masking, electrical, sometimes transparent will work. Be very precise in placing the tape over the notch, but not over the brass connector on the opposite side. Then place it in your card reader, format it, read and write files to your desire.
This is a little known issue with the design of all SD cards. The notch forces them to work in camera's, MP3 Players, PDA's, etc. that are portable devices, but not in USB card readers or computers with SD reader slots.
The card reader with the SD card has this extra built in feature to protect copyrights (for some reason on blank cards), and makes it useless for custom applications. Once you have "Unprotected" the SD card, installed your files, then remove the tape.
If you get the same error again after applying the tape, add a second layer. Double check that you did not cover the connection edge, and the plastic tab is closet to the side you insert in the device you are using.
Sometimes it takes several tries, but it will work with patience. If you have existing files on the SD card, insert it, right click, select properties. Then remove the "Read Only" check by the box and try to delete or add files then. If it says Disk Write Protected, then check the tape again.
It's annoying, but it will work with patience to bypass this design flaw.
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