Desktop

You can accomplish this if you use a third party software such as boot manager from partition magic or system commander
See the following sites
1)www.bootmanager.com/
2)www.users.intercom.com/~ranish/part
3www.masterbooter.com/
4)www.xosl.org/5)www.guideshardware.com/wwwboard/messages/38.html

If you do not want to go thru the trouble of a 3rd party software you may go into the bios setup each time you boot up and go into system settings and choose which harddrive to boot up primarily. If they are C and D tell it to boot from D or boot from C. I do this for my multi videocard adapter. 1 pci and 1 agp into 2 different monitors if I want to use both i have to boot with the pci graphics card. if i just want the primary monitor i use the agp.

The other responses work well. I've used both methods on several occasions.
Another way is to install a switch that allows you to select which drive will be booted. TRIOS sells one that works well and you can order it through Tigerdirect.com for about $70.00. It's a bit more expensive than the other methods, but is very reliable.

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