rereading your original post...you may want to do a chkdsk to make sure it is good. insert the card into the slot on the computer.. Enter the following command: chkdsk [sd card drive letter]: /r
if okay, remove the format in disk management. see the following steps copied from motos website
- Insert the card in the device
- You should see a “Set Up SD card” Notification
- Tap on ‘setup SD card’ in the insertion notification (or go to settings->storage->select card-> menu->format as internal)
- Select the ‘internal storage’ option, after have carefully read the warning