Greetings to all,
I am running bt4.vdi on virtualbox. when I type sudo fdisk -l, I get the follwing output :-

adminuser@VIRTUALBOXIMAGES:~$ sudo fdisk -l

Disk /dev/hda: 15.5 GB, 15554576384 bytes
255 heads, 63 sectors/track, 1891 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0005027f

Device Boot Start End Blocks Id System
/dev/hda1 * 1 1806 14506663+ 83 Linux
/dev/hda2 1807 1891 682762+ 5 Extended
/dev/hda5 1807 1891 682731 82 Linux swap / Solaris

Disk /dev/hdb: 2147 MB, 2147483648 bytes
16 heads, 63 sectors/track, 4161 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Disk identifier: 0x00000000

Disk /dev/hdb doesn't contain a valid partition table
Here other NTFS partitions are not showing up.
What is the reason behind this ?