From Linux Man Pages
e2label - Change the label on an ext2/ext3 filesystem
e2label device [ new-label ]
DESCRIPTION
e2label will display or change the filesystem label on the ext2 filesystem located on device.
If the optional argument new-label is not present, e2label will simply display the current filesystem label.
If the optional argument new-label is present, then e2label will set the filesystem label to be new-label. Ext2
filesystem labels can be at most 16 characters long; if new-label is longer than 16 characters, e2label will
truncate it and print a warning message.
It is also possible to set the filesystem label using the -L option of tune2fs(8).
AVAILABILITY
e2label is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net.
RELATED
mke2fs(8), tune2fs(8)
CATEGORY