Drive will not mount, help!

Please see below -

WDMyCloud:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
rootfs          1.9G  747M  1.1G  41% /
/dev/root       1.9G  747M  1.1G  41% /
tmpfs            23M  3.5M   20M  16% /run
tmpfs            40M   64K   40M   1% /run/lock
tmpfs            10M     0   10M   0% /dev
tmpfs           5.0M     0  5.0M   0% /run/shm
tmpfs           100M  2.4M   98M   3% /tmp
/dev/root       1.9G  747M  1.1G  41% /var/log.hdd
ramlog-tmpfs     20M  7.0M   13M  35% /var/log
/dev/root       1.9G  747M  1.1G  41% /CacheVolume
WDMyCloud:~#
Display all 1212 possibilities? (y or n)
WDMyCloud:~# fdisk -l

WARNING: GPT (GUID Partition Table) detected on ‘/dev/sda’! The util fdisk doesn’t support GPT. Use GNU Parted.

Disk /dev/sda: 3000.6 GB, 3000592982016 bytes
255 heads, 63 sectors/track, 364801 cylinders, total 5860533168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1  4294967295  2147483647+  ee  GPT
Partition 1 does not start on physical sector boundary.

Disk /dev/md0: 2047 MB, 2047803392 bytes
2 heads, 4 sectors/track, 499952 cylinders, total 3999616 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn’t contain a valid partition table
WDMyCloud:~# parted -l
Model: ATA WDC WD30EFRX-68E (scsi)
Disk /dev/sda: 3001GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt

Number  Start   End     Size    File system     Name     Flags
 3      15.7MB  528MB   513MB   linux-swap(v1)  primary
 1      528MB   2576MB  2048MB  ext3            primary  raid
 2      2576MB  4624MB  2048MB  ext3            primary  raid
 5      4624MB  4724MB  99.6MB                  primary
 6      4724MB  4824MB  101MB                   primary
 7      4824MB  4826MB  1049kB                  primary
 8      4826MB  4828MB  2097kB                  primary
 4      4828MB  3001GB  2996GB  ext4            primary

Model: Linux Software RAID Array (md)
Disk /dev/md0: 2048MB
Sector size (logical/physical): 512B/4096B
Partition Table: loop

Number  Start  End     Size    File system  Flags
 1      0.00B  2048MB  2048MB  ext3

WDMyCloud:~# ls /dev | grep sd
sda
sda1
sda2
sda3
sda4
sda5
sda6
sda7
sda8
WDMyCloud:~# mount -t ext4 /dev/sda4 /datavolume
mount: mount point /datavolume does not exist
WDMyCloud:~# mount -t auto /dev/sda4 /datavolume
mount: mount point /datavolume does not exist
WDMyCloud:~# ^C
WDMyCloud:~#