Question I cannot get my desire speed on samsung ssd

Dec 28, 2019
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Hello.
I brought a new Samsung Evo plus 250 m.2 and install it perfectly everything is good pc became fast but problem is when I want to copy any large files from pen drive I got 20MB/s ..is it the highest speed?

cofig:
Ryzen 5 3600
Mobo: MSI B450 Mortar MAX
Ram: 16Gb 3200Mhz
GPU: GTX 1660ti