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Question: Can I swap out my WD Green 1TB C: drive with a 250GB VelociRaptor drive and is there a program to copy all my files to new drive?
Document: WD Velociraptor WD1000DHTZ 1TB 3.5&#34; SATA Hard Drive  looks great and may be because I'm using the new processor is not working , I had to get ssd drive in order to make the system work.
I like the Velociraptors, but they like all drives don't last forever. The WD disk check software is useful. I generally use a 250 for independent C:\ drive, and clone that to yet another shelved as a backup in case of an emergency failure. My PC has three additional 1-3TB WD drives for user data files and duplicated backup (2).
The drive itself is almost the size of an SSD. The rest is just a massive heatsink.I've transferred files back and forth to a Sandisk Extreme on USB 3.0 at almost 190 MB/sec, the full benchmarked speed of the Sandisk. A SATA III interface makes a considerable difference even though the WD won't transfer data at 6 GB/sec.A very good value for a 1TB drive.
Since it's not possible to copy a functioning C:\, I minimize its size (250 is still far greater than needed for Windoze plus programs) and keep an exact clone (not copy) on the shelf. This little 250 is perfect for that task.
WD VelociRaptor 500 GB Workstation Hard Drive: 3.5 Inch, 10000 RPM...Used for Flight Sim (FS2004 & FSX). Each program on its' own removable HD.Has reduced load time dramatically.
shortly after noticing that the native 600 GB hard drive on my desktop was beginning to fail & going south fast.. I had to decide either to purchase a new hard drive... SSD  or SATA III..? and decide fast. high capacity SSD drive industry price points are still high. so I decided on purchasing a SATA III drive with minimum 10000 rpm and minimum 32 MB cache specs. the WD VelociRaptor is a mature product line & has been available for quite some time.
Have it as the data drive on the new computer I built. The C:/ is a 480 GB SSD. Hardly notice a difference in speed when going between the two.
I called Microsoft, willing to go so far as to buy a new copy of Windows but, amazingly, they were out of stock (64 bit). I called Asus (who made my computer) and they were absolutely no help and were more interested in getting personal info about me than they were about giving me any help.If you plan a clean install or if you plan to use this as a secondary drive you should have no problems.
I love it, it was connect and play as my new C Drive. So what, my start up is fractionally slower than the SSD (Kingston) but I have confidence I'll enjoy many years trouble free OS with this product. Get one and do yourself a system favor.
WD has always been a great product for me. I replaced my &#34;C&#34; drive with no issues. You always fee comfortable using their products!
Answer: No. Best to move everything you need to a third drive and install your new drive clean.  Then move anything you need back.  Anything that has to do with the operating system would have to be reinstalled on the new drive. Ie programs, the operating system itself, etc. you can use program specific saved files once the program is reinstalled.