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i am trying to create a partition on an external disk and format it using mkfs.ext4, but i am receiving the following error:

root@OpenWrt:/# mkfs.ext4 /dev/sda4
mke2fs 1.42.8 (20-Jun-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
4784128 inodes, 19109334 blocks
955466 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
584 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424

Allocating group tables: done
mkfs.ext4: Operation not supported while zeroing block 19109312 at end of filesy
Writing inode tables: done
Creating journal (32768 blocks): mkfs.ext4: Operation not supported
        while trying to create journal
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migrated from serverfault.com Aug 17 '13 at 12:51

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