unmount and delete partition

unmount and delete partition.
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Unmount the partition

# umount /dev/sda12
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Delete the partition.

1> unmount the partition
#umount /dev/sda12

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2> remove the entry from /etc/fstab

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3> remove partition
#fdisk /dev/sda

-press d to delete
-press w to save partition table

OR

#cfdisk /dev/sda

-select the partition to delete
-press delete tab
-write / save
-quit
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4> permanantly save partition table
#partx -a /dev/sda
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5> remove mounting directory
# rm -rf /data1
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6> #mount -a and # reboot
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