Bob Hi there! There’s too little info to say for sure what happened, but a few possibilities come to mind. If the card came from some kind of specialized external device, the manufacturer might have used custom formatting or data protection methods that don’t play well with Windows.
To help you better, could you share exactly what kind of device the card was used in? Also, please open Disk Management (right-click Start -> Disk Management), find the SD card in the list, and post a screenshot. With those details, we’ll be able to figure out if this is a partition loss or something the manufacturer intentionally locked down.
