External Lenovo CD Reader-writer voltage question

I am using 10.0.17763 build.

Recently I was given an external Lenovo CD/DVD reader/writer that according to instructions printed on it requires 5v. input. I have a transformer with variable output which allows you to choose your required voltage output. Unfortunately there is no 5v setting; there is a 4.5v and a 6v. So my question is: Is 4.5v not good enough to make the unit work 100%, and could a 6v setting damage the CD/DVD unit by burning something inside? I know nothing about electricity.

Incidentally, I have noticed that if I connect the unit to my laptop using a USB cable without any electrical input, it still shows on Windows Explorer and a CD in it can be ripped or copied without (seemingly) any problem. I don't know if this tit-bit is of any consequence.

Thanks in advance for all help.

Tony V.
Ottawa, Canada.

The CD unit receives the necessary power (5 V) from the USB 3.0 port.

Thanks Anibor, I was not aware of that. I just checked my system information and discovered that my 4 usb ports are all usb 3s. I have not tried writing with the Lenovo unit yet because for some reason I believed that that was the function that required the most power. Now that you tell me that the unit is actually getting its required 5V through the usb I shall try and write an audio CD and see what happens. For your info I shall report the outcome on this thread.

Once again, thank you.
My wishes to you for a happy and healthy 2020.

Thanks, same to you.