About use the vms disk

I create a VM on ui, and add one disk ,

when the vm started, a warning show:

2016/1/27 上午9:31:35Warning: creating filesystem that does not conform to ISO-9660.
2016/1/27 上午9:31:36VNC server will listen on Unix socket /vm/353da7b819161e02e72d94452c45c51a856f63a8b16bd7786f84f55df9cf210a/vnc

I exec to the vm container, and the folder /volumes/disk00 is mounted.
but what should i do to use the disk in vm?

can’t put more than one image, so I past the text below there:

root@ubuntu:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 1.4G 777M 491M 62% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 997M 4.0K 997M 1% /dev
tmpfs 201M 332K 200M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 1001M 0 1001M 0% /run/shm
none 100M 0 100M 0% /run/user
root@ubuntu:~# fdisk -l

Disk /dev/vda: 2361 MB, 2361393152 bytes
4 heads, 32 sectors/track, 36032 cylinders, total 4612096 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00035aa4

Device Boot Start End Blocks Id System
/dev/vda1 * 2048 4194303 2096128 83 Linux
root@ubuntu:~# ls /
bin boot dev etc home initrd.img lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var vmlinuz