Yes you can you still need to have the other hd set as a slave.
ok you have two hd with two OS you can edit the Boot.ini file to let you choose upon boot up between the two partitions:
Save a Backup Copy of Boot.ini
Right-click My Computer, and then click Properties.
-or-
In Control Panel, start the Performance and Maintenance tool, and then click System.
On the Advanced tab, click Settings under Startup and Recovery.
Under System Startup, click Edit. This opens the file in Notepad ready for editing.
In Notepad, click File on the Menu bar, and then click Save As.
Right click in an empty area of the Save As dialog box, point to New in the Context menu, and then click Folder.
Type a name for the new folder, for example temp, and then press the ENTER key to create the folder named temp.
Double-click the new folder named temp, and then click the Save button to save a backup copy of the Boot.ini file.
Edit the Boot.ini File
To view and edit the Boot.ini file:
Right-click My Computer, and then click Properties.
-or-
In Control Panel, start the Performance and Maintenance tool, and then click System.
On the Advanced tab, click Settings under Startup and Recovery.
Under System Startup, click Edit.
Sample Boot.ini File
This is a sample of a default Boot.ini file from a Windows XP Professional computer.
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect
This is a sample of the above Boot.ini file after adding another partition running Windows 2000 Professional.
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(1)rdisk(0)partition(1)\WINDOWS="Windows XP Professional" /fastdetect
multi(0)disk(0)rdisk(0)partition(2)\WINNT="Windows 2000 Professional" /fastdetect