What do data do I lose if I install a secondary internal hard drive?

I'm planning on buying a new SATA hard drive and I wanted to know if I would lose any data on my already installed hard drive when I install it. Also on Disk Management do I check the secondary hard drive as a primary partition? And does it matter if the hard drive is a 2.5" or a 3.5"?What do data do I lose if I install a secondary internal hard drive?
You will not lose any Data from the first drive, by installing a second one. Simply install the second hard drive, and turn on your computer. Unless your operating system is older than Windows 2000, your computer will find the hard drive on it's own.



On disk management, leave the original drive as the primary, unless you intend to install an operating system on it. If fit is for storage only, leave the new drive as a secondary drive.



As far as a 2.5 or a 3.5 disk, either one will work, but the bays are made for a 3.5, so a 2.5 would require an adapter bracket to adjust for the extra space.What do data do I lose if I install a secondary internal hard drive?
You lose no data.



Just install new drive with SATA cable. Then format it if not already formatted.



You can renumber it if you want. i did.



3.5 is what your desktop is wired and sized for.



I am assuming you are adding a disk not replacing one.



Use Disk Management to do this.What do data do I lose if I install a secondary internal hard drive?
If you are replacing it, you will lose everything: Unless you save it to another (external) hard drive.



If you are just adding it as a second (slave) drive, you will not lose anything.



It does not matter weather it is a 2.5 or 3.5" drive.
well if you're replacing the drive then unless you back it up or transfer the data you'll lose it all. if you just install it as a secondary hard drive then the first should be just fine.