After about half a year of usage I suddenly get the message that I cannot write or erase any file from my USB stick because it’s write protected! There is no physical switch so it has to be an software issue.
Eventually I found instructions how to remove the write protection via a windows programme but after having caaried out the clearing of the “read only” setting nothing has changed. When using the same instructions to format the disk I got the message that there is an I/O error.
The fault is not my PC because I use other USB devices including other USB sticks. Of course I don’t need any formatting, just being able to rease and write new files to the Sandisk Ultra USB 3.0 16GB disk is all I want and need to do.
Can you please tell me how to proceed? The stick has never dropped or been physically damaged in any way. This read-only condition suddenly appeared after having put some scanned documents onto the stick and then reading it on my main PC. After having read the files (all without any problems) I appear to be unable to erase them from the stick.
