Your board should have two IDE channels, with two IDE devices supported on each channel, usually 2 HDDs and DVD rom and DVD RW
If you only have 1 DVD drive then you have a spare socket on the IDE chale toplugin a HDD drive (yes they will fit where a Floopy is mounted).
If no spare IDE socket then you need an IDE controller card to fit in an empty PCI slot.
if your Vaio is reasonably new it may have sata on board and you can fit a sata drive.
The easiest way is to buy an external drive and plug it into a USB port.