CDRs are slow to copy, observable maximum transfer speed is usually around 2 to 3 MB/s. DVDRs are faster and can reach up to 10 MB/s, but average out at 6 to 7 MB/s.
Considering that CDRs are 700MB in size and DVDRs are 4.7GB, CDRs copy faster, per disc wise.
HDD to HDD can reach up to 30MB/s and beyond, and maximum can even reach 70 MB/s, with USB 3.0 and above.
But all these will come down to <1 MB/s especially with tiny files.
Another thing to note is that if you want to improve copying speed, you need to disable real-time protection of your anti-virus software, or the anti-virus function of your Windows Security.