Editing Existing Partitions
If you have an existing partition that you'd like to resize or change its mount point or filesystem type, select it and click Change. An Edit partition window will appear (Figure C-4).
The Use as and Mount point options work in the same way as those in the Create new partition window. You can also check Format the partition if you'd like all the data on it to be erased so you can start fresh. You have no choice but to format if you're changing the filesystem of a partition (for example, from FAT32 to Ext4), so be aware of that too.
To resize the partition, use the New partition size in megabytes option. If you change the size and then click OK, you'll be warned that the changes will be written to disk. Click Continue ...
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