The main intention to append the write protection switches in USB flash drives and SD cards is to prevent accidental file deletion and to avoid suspicious files such as malware/trojan etc. from unauthorized sources delivering/storing into the USB disk. If the USB disk is in read-only mode, any attempts to create (or) edit file into the USB disk will be denied, But when you really want to make changes in the USB disk to add some more information (or) to edit the information that is already present in it, the restriction that you added on your computer initially will now prevent you from making changes such as adding new files or deleting existing files from any USB disk drive plugged into it. However, you can still read the files available in it, but you'll not be allowed to make changes and format the disk. The disk is write-protected - You cannot format Having a flash drive/ SD card which is not completely accessible even by the owner of that device, is like having a l