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    "I discover that my external HDD has read-only mode. I didn't change anything before but OK, maybe it was just a little error." "Little errors" don't happen like that. Probably the system detected fs corruption and automounted it read-only. "I fix it pretty quickly." How? Which commands did you run? Commented Oct 3, 2018 at 12:30
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    Try posting the output of cat /proc/mounts/. Also do a stat /media/mint/A47A802C7A7FF97E. This path may not exist(and still be the working directory of the shell) as these folders usually are created dynamically. Commented Oct 3, 2018 at 12:42
  • @dr01 I run sudo mount -o remount,rw /media/mint/A47A802C7A7FF97E so I should be able to create file and directories, isn't it? Commented Oct 3, 2018 at 14:05
  • @rudib Path really exist. Moreover, last modified is dated September, 30th - right before the day my problem had begin. Commented Oct 3, 2018 at 14:11
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    sudo mount -o remount,rw will attempt to mount as rw, but if there is a problem, it may fall back to ro. That's why cat /proc/mounts/ might give us a hint. Commented Oct 3, 2018 at 14:31