Microsoft releases update to increase maximum transfer size of USB storage devices in Windows 7

Microsoft has recently made available an update that allows for increase in the maximum transfer size of USB storage devices in Windows 7 or in Windows Server 2008 R2.

For some USB storage devices, performance can be improved if the maximum transfer size is increased from the default 64 KB. This update supports this change when the hardware vendor provides a device information file (INF) to set this value for the USB storage devices.

The maximum size of a USB transfer is defined by the miniport driver of the USB host controller or by the USB port driver (Usbport.sys). If you use more than the maximum size of a USB transfer, the transfer request may fail, or a stop error may appear on a blue-screen.

After you install this update, you can increase the maximum transfer size from 64 kilobytes (KB) to 2 megabytes (MB) in the Usbstor.sys driver.

To download this hotfix, head over to Microsoft KB2581464

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