Well again up to user, there is no improvement when changing ratio/size of partition. Only difference it would make is the smaller of the 2 partition would be faster to scan for Virii scans or disk defragmentation. Won't change speed because effectively it's the same physical drive, just that it was "cut" (partitioned) in half to give you an effective built in backup. If you want go with one large partition and by an external drive to store data and backups. I have 1 physical drive partitioned into 3 "Volumes" (C,D,E drive) and my hard drive is split 140Gb/250Gb/250GB = 640Gb drive. Windows, office and the apps I need like Nero, winamp plus more are installed on C drive, Games and Movies are installed on D drive and Mp3s and backup on E drive. That's what I do, but for those who are new to this are better off leaving it as one large drive or 50/50 like the company presets (namely for the restore image that is hidden on the backup partition in case you have a problem and need to reinstall Windows) When given the chance open Windows backup and restore and go to help and about and just read the help files, it will give tyou a basic understanding of Windows backup