Considering the following scenario:

• You have a computer that is running one of the following operating systems:
  • Windows XP
  • Windows Vista
  • Windows Server 2008
• This computer has a Texas Instruments (TI) IEEE 1394 host controller installed.
• On this computer, you install hotfix 952824 or hotfix 951410.
• On this computer, you connect one or more IEEE 1394 digital video cameras or other isochronous streaming devices.
• You use these streaming devices to stream some data.

In this scenario, the device performance decreases. For example, streaming speed may become very slow, or some frames may be dropped.

On a Windows-based computer, devices that stream data over more than two isochronous channels by using IEEE 1394 connections may have choppy or distorted output. Typically, the issue occurs when multiple instances of isochronous data, such as audio data and video data, are streamed over the IEEE 1394 connections.

Note: This problem may also occur on a single physical device that has multiple channels of isochronous data. For example, this problem may also occur on an audio mixing board that outputs multiple audio channels over separate isochronous channels.

For example, you may have multiple digital video cameras, audio input devices, or both, that are connected to the computer by using the IEEE 1394 connections. In this case, streaming video that is output from the digital video cameras may appear choppy and may not have a smooth and steady frame rate. Steaming audio from the audio devices may have distorted sound.

Consider the following scenario:

• You have a Windows Vista-based computer that uses an Open Host Controller Interface (OHCI) host controller. This OHCI host controller is Institute of Electrical and Electronics Engineers (IEEE) 1394-compliant.
• You have two IEEE 1394-compliant storage devices.

In this scenario, you may experience one of the following issues:

• When you start the computer and connect the first IEEE 1394-compliant storage device to the OHCI host controller, the device is loaded correctly. However, when you connect the second storage device, this device never appears in Device Manager. Additionally, the first device disappears from Device Manager.
• When you connect the two IEEE 1394-compliant storage devices before the computer is started, neither device appears in Device Manager after you start the computer.

You connect an external hard disk that is based on the Institute of Electrical and Electronics Engineers, Inc. (IEEE) 1394 standard to a Windows Vista-based computer. However, the external hard disk is not detected.

This symptom occurs on dual-capability external hard disks that can be connected by using an IEEE 1394 connection or a USB connection. However, this symptom only occurs when the external hard disk is connected by using an IEEE 1394 connection.

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When you use an IEEE 1394-based scanner and run a 32-bit scanning program on a computer that is running Microsoft Windows XP 64-bit, Microsoft Windows Server 2003, you receive an error message on a blue screen that resembles one of the following:

0×0000000A: IRQL_NOT_LESS_OR_EQUAL

0×000000BE: ATTEMPTED_WRITE_TO_READONLY_MEMORY

This problem occurs when the scanning program calls the DeviceIoControl function to send a IOCTL_SCSISCAN_CMD control code to the kernel mode driver.

In Windows Vista, you may not experience the blue screen. When your scanning program calls the DeviceIoControl function to send an IOCTL_SCSISCAN_CMD control code to the kernel mode driver in Windows Vista, this call may not be completed successfully, and your scanning program does not work as expected. The exact symptom that is observed in the user interface depends on how your scanning software works when the DeviceIoControl function fails.

Note: If your scanning program does not work correctly, it may be related to various causes．You have to contact the software vendor first to check whether you are encountering the exact problem that is described in this article.

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Consider the following scenario. You connect an Institute of Electrical and Electronics Engineers (IEEE) 1394 hard disk to a Windows Vista-based computer that uses a VIA Technologies 1394 host controller. However, performance is slower than you expect when you read from the hard disk or write to the hard disk.

For example, you may experience decreased reading and writing performance of approximately 20 percent in Windows Vista when you compare it to Microsoft Windows XP with Service Pack 2 in the same test environment.