Copying files VERY slow, speed drops to zero, even on USB 3 -- no - Microsoft Community
Top 7 Data Transfer Speed Slowdowns - Internal SSD
Copying files VERY slow, speed drops to zero, even on USB 3 -- no - Microsoft Community
Reasons for irregular—sporadically slow to fast—USB flash drive transfer speeds - Super User
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USB Drive read/write 100%... very slow write - Windows 10 Forums