A:AnswerYes it you can. It is optional. I wondered the same thing until I read the manual that came with it. Or there is an external one you just plug it up to the computer.
A:AnswerI googled information on the right laptop for the oculus rift and they recommendhttps://www.pcmag.com/review/362500/acer-predator-helios-300-2018-15-inch The more power the laptop has Will serve your purpose when using the oculus rift it seems like the laptop you may need may be more expensive
A:AnswerWindows Defender is included with Windows 10 and is turned on by default. I don't know about the Office, since mine only came with the trial version and I'm not planning on using it, since I won't need it for what i bought the laptop for.
A:AnswerIt can be charged and used while not connected. Battery life is pretty impressive. Old day about 4.5-6hrs of useasge. Than again I haven’t fully paid attention to how long I have really used it between charges.
Hope this helps.
A:AnswerNo room for an internal drive, but just add an external drive using one of the USB ports. I don't know about video editing, but photo editing works very well.