2 disks or partitions are shown on each VM installation

Hello, I wonder why they are always shown two disks or partitions across virtual machine installation, and also how to fix it, because I can not install this operating system. Since I can not insert image will dive as it appears:

Windows XP installation

Disk 0 of 1 MB in Id 1 on bus 0 in atapi [MBR]

Disk 0 of 20000 MB in Id 0 on bus 0 in atapi [MBR]