Why is the speed of my K'1 drive less than 140 MB/s? Jul 15, 2016 2:20:01 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by admin on Jul 15, 2016 2:20:01 GMT The maximum read speed from a USB 3.0 port is 140 MB/s. If your computer has USB 2.0 ports, the maximum read speed you will get will be less than 140 MB/s.