The new harddrive technology you refer to is SATA.

A SATA power cable is used,

http://www.playtool.com/pages/psuconnectors/connectors.html#sata

,and a SATA target="_blank">http://en.wikipedia.org/wiki/SATA

To the upper right of the page shows a SATA target="_blank">http://en.wikipedia.org/wiki/Parallel_ATA#IDE_and_ATA-1

The Gigabyte GA-81845GVM-RZ motherboard's Storage Controller Type support is IDE, [ DMA/ATA-100 (Ultra) X 2 ],

http://www.dealtime.com/Gigabyte-Gigabyte-Technology-i845GVup-to-2GB-DDRDIMM-3DDR/info?tab=specs

There are no SATA headers on the motherboard,

http://www.ebay.com/itm/Gigabyte-GA-8I845GVM-RZ-Motherboard-DHL-UPS-3-8-DAY-/390337518730?_trksid=p4340.m185&_trkparms=algo%3DSIC.NPJS%26its%3DI%26itu%3DUA%26otn%3D5%26pmod%3D180645618978%26ps%3D63%26clkid%3D5166955561701266148

HOWEVER,....all is not lost. You can install a SATA Adapter Card in an unused PCI (White long slot), and use a SATA harddrive.

Example of a SATA Adapter Card,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2329305&CatId=1455

With the above SATA Adapter Card model, you will have 4 internal SATA headers. They are on the adapter card.

[ Also advise maxing out the Ram Memory, and using the best Intel Pentium 4, Socket 478 processor, that you can obtain.
The CPU Support Chart is available on the Gigabyte Support main page]

For additional questions please post in a Comment.

Regards,
joecoolvette