USB WAVE-LIKE TRANSFER in Storage Devices Posted October 21, 2019 2 minutes ago, Electronics Wizardy said: Looks like a cache that is getting filled up. Probably filling the ram cache or a slc cache on the drive. pretty normal for a usb stick. 2 minutes ago, Zando Bob said: Yeah that's normal, it's going to slow down/speed up depending on what type and what size of file it's copying. Oh.. I actually didnt know it was like that because the very first file an .mp4 had no slowdown/speedup and i was convinced all .mp4 files would behave like the first one but I was wrong. Thanks for the replies.