Cannot write, format, nor erase flash drive
Solution 1:
I want to erase all the data inside because it is useless.
If the data might be useful to a criminal, break open the casing until you can see the memory chips. Use a hammer to drive a nail through the chips.
It's just a simple small 4 gig one
You can probably replace it for $5-$10. Don't spend too long trying to get it working.
Solution 2:
The HP USB Disk Storage Format Tool is about the best at this kind of thing - if it can't work on the drive then it's possibly beyond help.
http://files.extremeoverclocking.com/file.php?f=197
Solution 3:
Try this :
1) Right click 'My computer' -> Manage or Management -> Disk management
2) select your USB drive -> Right click ->"change drive letter and paths"
3) Then Rename it to a different letter
Check whether it starts working or not !!
If it doesn't.. then options left are: 1) using diskpart 2) using registry 3) Low level formatting
Steps are lengthy and precise (must be done with accurcy) it is better to do it from here:
http://goo.gl/fgHgX