Almost formatted my main disk with GParted. Is it safe to reboot?

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http://askubuntu.com – While trying to format my USB key, I accidentally selected /dev/sda and proceeded to format the disk. Luckily, the formatting was interrupted when GParted noticed the drive was currently mounted. However, I can't see the partitions anymore (even when I restart GParted, I keep seeing this): I haven't rebooted yet as I am afraid to do so. At the moment, I can use my filesystem just fine but I'm afraid that if I reboot some bad things might happen. What can I do to fix this? Is it safe to reboot? UPDATE: I was attempting to create a bootable USB key for Windows 7 so I clicked Device/Create (HowTos)