One of the most frequently asked questions posed to Western Digital Technical Support is how to transfer all files from the old to the new drive and make it the boot drive in Windows 95-98,NT-4.0.

Probably the best way to do this is by using Data Lifeguard Tools to copy your old drive onto the new blank drive.
If you use Data Lifeguard Tools, you don't need to follow the manual procedure below.
Note: Data Lifeguard Tools is only for use with our EIDE drives and does not work on or SCSI drives.

Here we have compiled a list of steps (that have been tested and recommended by many of our customers) that should allow you to manually copy your files over to your new drive, then make the new drive your primary or boot drive.

NOTE: The following steps may not be effective in your system. Microsoft does not recommend the use of the following procedure, however, results as reported by many of our customers have been very positive. Western Digital nor System Wide Resources make no warranty, implied or otherwise, regarding the reliability of the proceeding information. This information is provided, as is, solely for your information. Please consult your system manual or system manufacturer for product specifications, warranty information, and any further details. We recommend that you back up your data before continuing.

First, install your drive as a slave/secondary drive to your existing hard drive. Be sure to jumper both of your drives properly. See Typical Hard Drive Installation for further information.
Create a Boot diskette (Rescue disk) as follows:
Double-click on My Computer
Double-click on Control Panel
Double-click Add/Remove Programs
Click the Startup Disk tab in the dialog box
Click Create Disk, and follow the instructions
Restart your computer in MS-DOS mode and using Data Lifeguard Tools, partition and format your drive.
In either case, be sure to transfer the system files to your new drive using the SYS command. You can transfer the system files by opening a DOS session under Windows 95-98 and type:
sys d:
Close the DOS window and double-click on My Computer again. Double-click on Control Panel and then System. Click on Performance tab and Virtual Memory button. Click on "Let me specify my own system memory setting" and disable virtual memory.

Restart Windows 95-98 and on the Taskbar click Start, then Run and type:
xcopy c:\*.* /e /h /k /r /c d:
and click OK. This command line copies all your files to the new drive. If your existing drive is fairly large, this operation could take some time. Do not power down your system during this operation.
Once this operation is completed, shut down Windows 95-98, turn off your PC, and change the jumper settings on your drive so that your new Caviar drive is the master/primary and the older drive is the slave/secondary drive.
Turn on the PC and edit the CMOS settings to reflect the change in master/slave drives. If you used Data Lifeguard Tools to partition/format the new drive skip the step in the next paragraph. You don't need to manually set the partition to active, Data Lifeguard Tools has already done so. If Data Lifeguard Tools was used, boot from the new drive and move on to the steps in the last paragraph, otherwise continue below.

Place your boot diskette in the floppy drive and boot to the A: prompt. From the A: prompt, type Fdisk and select option 2 to make the primary partition on your new disk drive the active partition, then exit Fdisk and reboot.
Windows 95 should boot from the new hard disk. It is a good idea to allow Windows 95-98 to determine your Virtual Memory settings. To do so, double-click on My Computer, then Control Panel and System icon. Click on Performance tab and Virtual Memory button then Click on "Let Windows specify my own system memory setting."
For further information, we recommend reading these articles from PC World Online:
New Tips on Adding a Second Hard Disk
Replace Your C: Drive in Win 95-98