Are the Gigabyte Motherboard and Hitachi Deskstar Hard drive compatible?
I understand that SATA would have been the better way to go at the time but I want to keep all of my information, photos, XP software etc. for the move.
I went through a similar process a couple of years ago, and it was thanks to the same motherboard as your ASROCK that I was able to achieve it relatively painlessly.
I had a PATA hard drive 160GB, but wanted a bigger drive and it seemed like a good time to go to SATA. I bought the ASROCK because it has SATA and 2 x PATA connectors on the board, which allowed me to use the 2 types of drive together without having to go without either of my CD/DVD devices.
Most modern boards come with multiple SATA connectors, but only one IDE/PATA connector, which means that you either have to live without the PATA drive or put it on the same ribbon as the CD/DVD drive.
The particular problem with the ASRock board is that it only supports SATA I (150Mbps), which is half that of a SATA II Drive which supports a theoretical maximum of 300Mbps. However, there is no reason why you shouldn't use the Hitachi HDD on the new board, or a SATA II HDD on the old one.
That is an expensive Gigabite board you are buying and I think you should consider switching to SATA in the not distant future - you can pick up a good 500GB drive for well under £50 - see here for an example:
You could use this HDD as your system disk, then use the IDE HDD as an internal backup drive, though I eventually did away with mine in favour of 2 x 500GB internal drives and an external 320GB as a second backup.