Question is how are you getting the OS off the 80GB onto the 300GB ?
What version of Windows (and Service Pack) are you using ?
Is your MB BIOS up to date ? PCs without a current BIOS may see not see the full 300GBs of disk space.
I just purchased a new Seagate 300 gig sata hard drive. My question is, can I use an eide harddrive and a sate harddrive together? The 80 gig hd that I have now is going to be for backup storage and the new hd will hold the operating system. Will they work together? thanks