A new hotfix KB2581464 updated by Microsoft for Windows 7 and Windows Server 2008 R2 users to increase the maximum transfer size of USB storage devices.
KB2581464 :http://support.microsoft.com/kb/2581464/
Download KB2581464 :http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2581464&kbln=en-us
After you install this update, you can increase the maximum transfer size from 64 kilobytes (KB) to 2 megabytes (MB) for USB storage devices.
Install KB2581464 Hotfix
1. Download hotfix KB2581464 and installed, then reboot PC.
2. Click ‘Start’ and type ‘regedit’ in windows 7 search box, press enter.
3. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\usbstor
4. Create a new sub-key VVVVPPPP under usbstor.
5.In right side panel,right click select ‘New’ -> ‘DWORD Value’, give a name as ‘MaximumTransferLength‘.
6. Double click ‘MaximumTransferLength’, set Base to Decimal and key in Value data to 2097120.
7.Then restart PC again. That all.
Below are the screenshot copy speed rate before and after applied hotfix which transfer a 649 MB size file to Buffalo external hard disk.
- BEFORE
- AFTER
Noticed that Copy speed is 100% increase after applied the new hotfix.
PS : Not all the USB storage devices performance can be improve after applied this hotfix. This update supports this change when the hardware vendor provides a device information file (INF) to set this value for the USB storage devices.
Don’t you mean transfer “rate”?
Yes.
Is the Buffalo USB2 or USB3? If USB2, 77 is impossibly high, isn’t it? Also, does Buffalo happen to provide the INF for this setting (unlikely considering how new this update is)? If USB3, then it was certainly underperforming before.
Need some timed transfers of known data amounts for accurate transfer rate calculations. 77 MB/sec as shown on the window above is beyond the theoretical max of USB 2.0 480Mbps (60 MB/sec)
It was 14 to 16 MB/sec for a Pen drive and remain same and it was 3 to 5 MB/sec at a Memory Card connected via USB (Port usb 2.0). Whats wrong with the update and registry edit. I have done it correctly.