SSD/USB3.0 Speed Drop

  1.    23 Oct 2016 #1

    SSD/USB3.0 Speed Drop

    When transferring files from my external SSD/USB3.0 to my PC, the speed drops from around 300MB/s to 105MB/s.
    It stays at 300MB/s almost 60% of the transfer, then it Drops.

    What to do so that there is no Drop?

    EDIT: Disabling the "Write Cache" for HDD in PC, the speed drops to around 45MB/s, instead of 105MB/s.

    Click image for larger version. 

Name:	usb30 speed drop.jpg 
Views:	25 
Size:	35.7 KB 
ID:	107213
      My ComputerSystem Spec

  2.    24 Oct 2016 #2

    ISO files are an archive format that results from making a sector-by-sector copy of every "dirty" (written-to) sector in a storage collection. Originally developed for optical media, ISOs are used for creating containers for all kinds of information including Windows images and install environments. Typically, throughput drops during copying as the size of the individual elements drops and the number goes up. I've seen the kind of graph you show in your screencap for many ISO transfers. I can't find a definitive source to confirm this, but my best speculation is that the drop-off occurs when the contents of the ISO switches from large binary files like .wim or .esd to the thousands of small individual files you will see in a mounted Windows ISO, especially in the /sources directory and its subsidiary directories.
      My ComputersSystem Spec

  3.    24 Oct 2016 #3


    It seems like the OP is just copying the single ISO file itself and not extracting the contents of the file. That would be no different than copying a 2 or 3 GB WMV or AVI media file, for example. Personally, the file transfer shown in the OP looks perfectly normal to me - at least that is the way all my large file copies look like across my computers.

    At the beginning you are seeing the various cache memories involved filling up, at the end you are seeing the actual writing to the final storage location occurring.
      My ComputerSystem Spec

  4.    24 Oct 2016 #4

    Yes, another good explanation, and probably more valid than mine. Thanks!
      My ComputersSystem Spec


Related Threads
Solved Sudden Internet Speed Drop in Network and Sharing
Hello. About 3 weeks ago I noticed I was getting between 40-60mb download, when my ISP package says 200mb. I was previously getting the full 200mb and then some. Technicians from my ISP came out, ran new cabling through the house and out to the...
I am wondering if there is some problem with the Wlan Drivers / Windows. I have a Intel AC7260 Wlan card with BT. With BT off, I am achieving a speed of around 7,6 MB/s while transferring files over Network . With BT on and no Device connected...
When I open the BIOS the pen drives plugged into the USB3 hub are not listed in the "Boot priority settings", however, if a pen drive is plugged directly into the PC USB3 or USB2 port it appears in the "Boot priority settings". Once booted into...
Hi there crazy --I have a laptop with 1 USB3 socket and 2 USB2 sockets. The USB3 socket is also a "charging" usb socket. Now if I plug a USB3 HDD (Toshiba) into a USB2 socket where I've connected a powered USB2 hub I'm getting copy speeds of...
I was told by somebody here with VIP badges that I should not post here how to make Firefox run more smoothly in a Virtual Machine in Linux. It should be in a Linux forum. So I moved it there.
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 17:43.
Find Us