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I'm able to erase a partition using the Disk Utility, but I want to change the name without losing data. How is it possible?

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To rename the volume, enter the following in Terminal:

/usr/sbin/diskutil rename oldname newname

for example:

/usr/sbin/diskutil rename "Macintosh HD" "Mac Disk"

You can also right-click a partition in Finder (in Computername at the top level of the hierarchy), select Get Info, and enter the new name there.

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If you rename the volume where your home directory is, don't forget to update your home directory path in the System Preferences before rebooting. – Christian Lescuyer Dec 13 '12 at 10:42
@ChristianLescuyer That's only a problem if your home directory isn't on the root volume (i.e. the default), and isn't assigned a static mount point e.g. through /etc/fstab. – Daniel Beck♦ Feb 9 at 8:35

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