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I'm not sure what happened, but right now all filesystems (expecpt for / which is on a separate drive) are "read only" even though mount lists them as "rw":

$ mount
/dev/sda1 on /media/Data type ext4 (rw,nosuid,nodev,user_xattr)

But wehn trying to create a file, I get:

$ cd /media/Data/; touch hello
touch: cannot touch `hello': Read-only file system

Trying to remount as rw leads to an error:

$ sudo mount -o remount,rw -t ext4 /dev/sda1 /media/Data
mount: cannot remount block device /dev/sda1 read-write, is write-protected

Any suggestions? could this be a physical problem of the drive?

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mount reads the content of the file /etc/mtab. Under some circumstances is this file not up to date.

Please double-check this against /proc/mounts.

The reason for the message cannot remount block device /dev/sda1 read-write, is write-protected may be a hardware write protection, e.g. a switch on the usb-stick.

To investigate your problem, you may investigate the output of dmesg shortly after you have tried to mount the partition.

Also a file system check with fsck is a valuable approach.

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hmm.. you're right - it lists as ro. It's a laptop hard drive (non flash). So what do I do now? – nbubis Mar 11 '13 at 20:06

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