I've done this before on my machines, but this one belongs to my wife! I usually have success, but sometimes it turns in to a time consuming nightmare.
EDIT How about this for safety?
- Buy new small drive
- Install Linux OS with only new drive connected
- Run this way to get accustomed
- Connect both drives and modify Windows boot manager to point to new drive as a secondary choice. /EDIT
Computer is ACER desktop ATC-605-UB11 HD has only one partition large enough for an OS.
I tried running MINT from the USB stick and it worked great. Also would like GRUB to default to Windows at least in the beginning. Should I use windows partition tool or Ubuntu. Thanks! Stan