Hello all, I'm new to Kali and usng pendrive for Kali boot.

I mount the hard disk using mouse's right click. From the properties, there seems to be read and write permission, but whenever I try to write files to the hard drive, e.g. copy and move, there is no paste option

I've tried using terminal with cp command and there is an error saying: 'cp: cannot create regular file '/media/kali/Data/[FWS] Chapter 6 Challenge.pdf': Read-only file system'

Can anybody with the same experience enlighten me about this problem?

Thankyou,
best regards