the blue ray disc could be wiped out. but cd's , specially write only= are very useful in these scenarios. viruses cant over write , unlike usb, sd metal drives and etc.

daviddag is right. but if the thing you are fixing wont command a cd drive, yAs= you must have two usb's= usb1 and usb 2. use usb2 for your fixings. usb1 as back up only. after fixing=format usb2 and copy usb1 to usb2 . your pc was maybe infected also= so better have these files from usb1( you may secure first your pc using usb1(updated) before copying usb1 to usb2) .

world of mis trust.