I think you might have a drive letter conflict. Try this.
0. Connect the Reader to PC
1. Press Win+R
2. Type diskmgmt.msc, Enter
3. Check the drive list below. Look for "Removable" of around 1.50GB. It should be labeled READER.
4. Right-click it and choose "Change drive letter".
5. Click Change (or Add, if there are none) and choose a free letter.
Hope this helps.
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