If you want to use the drive as slave, remove the old drive, set the new drive as a Master, and prep it with fdisk and format per http://duxcw.com/digest/Howto/buildcom/socka/13.htm instead of WDís Data Lifeguard Tools. When done, jumper and connect it as a slave. Disconnecting the old drive also helps avoid the mistake of prepíing the wrong drive/partition. However, I would make the WD the Master, especially if it is a 7,200 RPM drive and the old drive is 5,400 RPM. Not only is it faster, the new drive should be more reliable and last longer than the old one. This could be done by doing a clean install of Windows (see our How tos), copy data from the old drive to the new one, and reinstalling all applications, or by copying an image of the old drive to the new one with an image copying utility such as the Acronis OSSelector (http://www.acronis.com/products/oss50/list.html), Norton's Ghost (http://www.symantec.com/region/au_nz/product/ghost/), Paragonís Partition Manager (http://www.partition-manager.com/n_pm_main.htm), PowerQuest's Partition Magic (http://www.powerquest.com/partitionmagic/). Also, there are other image copying programs available from various download web sites such as download.com (http://download.cnet.com/downloads/0,10151,0-10094-106-0-1-0,00.html?tag=st.d). Lifeguard is capable of doing a simple image transfer.
If you motherboard has two IDE interfaces, image and data transfers will go much faster if the two drives are set as Masters, with no Slave present, and connecting each to one of the interfaces for the transfer. That is, temporarily disconnect the CD-ROM and connect the new drive in its place. However, do not leave the drive on the secondary with the CD-ROM if you are going to use the drive frequently. A CD-ROM can slow-down a hard disk drive. I am working on a How to article on this subject and it is almost completed. It should be posted in a few days. Larry