For the reason that I am writing to you is to ask for your help, related to some sd cards that sometimes get damaged, people are protected against writing, I would like to do with an arduino nano said interface that allows to solve this problem I really do not I have a lot of programming knowledge in arduino, I don't know if it will be possible to add a connector for some additional sd.
No people can't do that. What they can do is to move the notch on the CD card so that a pair of switch contacts are made. It is then up to the software to detect this switch and not write to the SD card if it is made. There is nothing more to it than this. If you want to write code that ignores this switch you are free to do so. Likewise if you want the switch to indicate your SD card is protected then your software has to read this switch an respect it. The switch does not protect anything if the code ignores the switch.
The switch contacts are on the SD socket, if there is not one on the socket you have then you have to replace the whole socket, which can be a tricky soldering job.
Thank you friend for answering, I think I did not explain well, excuse me my inges is not the best I am using google translation, my goal is to recover the micro sd cards, sometimes I get people who have these cards that apparently are written some bit that tells the cardholder that it is write-protected, look at what I've searched on the net that allows to remove this write-protection and there is no god who can solve this problem, for years I have been researching on the subject, and then I have hope that with arduino I achieve this problem.
That has got to tell you something. I don't know what bit this is , or how to get at it or even if it is reversible if it does exist.