Don't forget that one of those two just happens to be the OS partition where if anything goes wrong say goodbye to Windows! As far as the merge option I've never run across that in any live cd version of GParted. There's also no reference found in any of the documentation.
GPARTED DOCUMENTATION - GENERALITIES
Some additional screenshots are seen at
GParted -- Screenshots In fact the only actual instructions for seeing two partitions merged in generally found in a Linux turorial of some type.
"Optional: merging the first two partitions
For this step you need to boot your pc from an alternate linux distribution. The recipe below is for puppy linux (see Installing Puppy Linux for the eeePC for information on how to install puppylinux on an usb disk.) You may also use Gparted LiveCD from USB stick.
It might be desirable to merge the first two partitions, in order to create one bigger partition. To do so perform the following steps:
make one more time sure that you do not have any data you do not want to loose on your second partition; if you still have data on your second partition probably the best way to back it up is by “sudo bash†then “mount /dev/sda2 /mnt; cd /mnt; tar cvf <dirwhereyourusbdiskismounted>/sda2.tarâ€)
Boot a linux distribution from an external medium (usb flash disk, SD card, CD/DVD drive)
start a console window
run gparted
in the UI you will see 4 partitions. Select the second one (the ext3 partition, for me /dev/hdc2)
press the delete button.
select the first partition (the ext2 partition, for me /dev/hdc1).
press the resize/move button
in the dialog box that pops up, enter the maximum size (shown in the first line of text) into the box: New Size (for my 4G this was 3797, but this might be different for you)
press the resize/move button on the form
check the apply button, confirm by pressing the apply buttion that appears in the confirmation box.
you'll now see a progress indicator. The operation will take several minutes. Once completed close gparted.
If you made an sda2.tar file above you can recover it by rebooting then “sudo bash†then “cd /; tar xvf <dirwhereyourusbdiskismounted>/sda2.tar†"
Removing UnionFS/aufs [EeeUser Eee PC Wiki]