Hardware Troubleshooting in Linux > Other Devices

I changed partition label and i used this without reboot... safe or dangerous?

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newbie_:
I used the commands

--- Code: ---sudo umount /dev/sda5

--- End code ---
and then

--- Code: ---sudo e2labl /dev/sda5 data

--- End code ---
for change a partition label on my HD.
Then i mounted and used this partition without reboot (the label changed only after a reboot), is this safe or dangerous? i have very important data on this partition... thank you.

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