Fix problems with the drive in disk utility on mac (replace x with the drive letter of your usb drive) this will check for and fix any disk errors Make sure the usb drive's lock switch isn't set to lock or read only.
Memoria USB - Wikipedia, la enciclopedia libre
The usb should be the last one in the list
Now type select disk # (# being the number of your usb flash drive)
Type attributes disk to see the current read status of the drive. Follow the 5 disk read only fix solutions on this page and try to change a hard drive from read only on your own. All of the data is still there But nothing can be wr.
Open command prompt as an administrator and run
