有个8G的U盘，格式化成exfat格式。插入电脑后点击盘符，弹出错误提示：
无法挂载 “7.9 GB Filesystem”. Error mounting: mount exited with exit code 1: helper failed with: ERROR: failed to open `/dev/sdb1‘ in read-write mode. ERROR: failed to open `/dev/sdb1‘ in read-only mode.
.
google后发现找个：
First, make sure your user is in floppy, cdrom, plugdev and fuse groups.
Second, make sure your hard disk is not listed in /etc/fstab. If so, comment it out.
按此提示操作：
sudo vi /etc/fstab
看到最后有2行：
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0 /dev/sdb1 /media/usb0 auto rw,user,noauto 0 0
将最后一行注释掉即可！
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原文：http://www.cnblogs.com/ibgo/p/4207029.html