Increase Maximum File Transfer size of USB in Windows 7 | Hotfix

In Windows 7 and Windows 2008 R2, the maximum transfer size of USB is set to 64 KB. It means at one instant, maximum file size to be transferred from Windows 7 Computer to USB Devices is 64 KB. To override that restriction, Microsoft released a hotfix to increase the maximum transfer size from 64 kilobytes (KB) to 2 megabytes (MB) in the Usbstor.sys driver.

Download Update kb2581464 from official website. Select the Windows version (32 or 64 Bit) and enter email address to request download link on email.

  1. Click Start, type regedit in the Start Search box, and then press Enter.
  2. Locate and then click the following registry subkey:

  3. Click Edit, point to New, and then click DWORDValue.
  4. Type MaximumTransferLength, and then press Enter.
  5. Click Edit, and then click Modify.
  6. In the Value data box, type a value to specify the maximum transfer size between 64KB and 2MB. For example, you select Decimal and type a value between 65535 (64K) and 2097120 (2M).
  7. Exit Registry Editor.

Restart the computer and changes are made now! Try connecting USB Pendrive or something and you will notice changes immediately when transferring file.

Click Here to Leave a Comment Below 14 comments
Gourav - August 21, 2011

Will the transfer speed increase?

    Rohit Langde - August 21, 2011

    Obviously yes Gourav because per piece size to be transferred is increased. It was just a restriction by default and Microsoft itself released an Hotfix for that.

B Padhee - August 21, 2011

Have a nice time buddy, I am not clear wheather we should install the hotfix and then change the registry OR any one of them.

Thanks & Regards
B Padhee

    Rohit Langde - August 21, 2011

    Install the Hotfix >> Make Registry Edits >> Restart >> You are Done!
    I hope now it is clear.

Dr Depak Tiwari - August 21, 2011

hey Rohit,
ur blog is great buddy…though I am not directly in to IT,but i am a great fan of u..ur blog is too informative and with simple to do steps..really help a lot…

Dr Deepak Tiwari
MBBS,DNB,MNAMC,PDCC(Cardiac Anaesthesia)

    Rohit Langde - August 21, 2011

    Thank you Dr. Deepak; Blogsolute always strive to make Things easier even for non-tech-savvy person.

srinusmart - August 24, 2011

Dude the speed of this USB file transfer is very amazing. Can’t belive how the file’s are tranforming with that speed. It’s incredible. Increased my speed upto 10x times than before. Thanks for your good post 🙂

    Rohit Langde - August 25, 2011

    Obviously, it was going to happen. From 64KB to 2 MB, it makes a big difference.

Sashank - August 25, 2011

Hey , Why cant i put on the max allowed size for the DWORD , ??

thanx for the answers in advance,!! ..

    Rohit Langde - August 25, 2011

    2MB as mentioned which equals 2097120

Sashank - August 27, 2011

Y leave it as just 2 Mb When it can be further increased ?? , Will it lead to any problm’s??

    Rohit Langde - August 27, 2011

    Support for 2MB per piece is offered using this Hotfix which was earlier restricted only to 64KB. So, increasing the number further won’t make sense.

sachin shedole - August 30, 2011

Till now i just heard about increasing ram using usb, your post seems to be helpful to many of us with slow usb transfer speed.

Manoj - March 29, 2012

Rohit. should it be hexadecimal or decimal while we modify it….


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