You would have to set the partitions at an operating system level first. You will be pleased to know that there are others on these forums who are far more techncially minded than me who can offer good advice or advise of software tools that will allow you to create partitions on the fly.
I am trying to get rid of dropping frames and think the write speed/fragmentation of the HDD is causing (part?) the problem! Can anyone explain how to "reserve" a portion of HDD and dedicate it to Ulead Video Studio 8 for saving the captured file? I would like to try this one before I go for a (new) separate drive only for capturing. I have tried to do that on (not sure if proper) File>Properties>Preview tab by setting the limit of used HDD, but it seems that the settings are not saved when I return afterwards.
Having said that a physical partition will always perform better than a logical partition, so I would suggest you save up your pennies and get that second hard drive. Meantime derfrag your existing hard disk.
COMPAQ something or other with 500Gb Boot Disk, 1Tb external Firewire Disk, 4Gb Memory and a super duper sound card, 19" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
Sony Vegas Studio editions to v11
Remember, there is always more to learn than there is to teach.