How can I delete these files? Doesn't work from file browser.
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Also please check this related question and see if it helps: superuser.com/questions/456815/… – xavier_fakerat May 18 '17 at 12:19
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Are we talking about a real physical SD-Card or ist it the SD-Card section of the Smartphone-internal memory? – Robert May 18 '17 at 17:10
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@Robert The card is physical. Tried to format, got an error on the phone. will try on the pc. – TMOTTM May 19 '17 at 6:28
It appears like your SD card is corrupted, take backup of your important files and do a format.
Some linux formatting guide can be found here SD card formatting linux