Flash USB suddenly mount read only

Flash USB suddenly mount read only

I have a new flash drive of sandisk, I plugged in to the laptop. It mounted okay, but can’t do anything into it. I inspected it, and it read only.

According to the source here, there was something wrong with the mount utility. I have to do the following command in console to fix it.

sudo umount /dev/sdb1 (this is where my flash is mounted)

sudo dosfsck /dev/sdb1

But there was a warning said

fsck, dirty bit is set. Fs was not properly unmounted and some data may be corrupt.
1. Remove dirty bit
2. No action

bla bla bla …

Free cluster summary wrong (1753721 vs really 1873745)
1. Correct
2. Don’ Correct

I chose all the number 1 option.

Finally the verification to perform, I chose yes.

Then unplugged the flash and plug it in.

Now it is okay. I can read and write again.

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