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Performance Monitor begins collecting data about your USB devices and connections Attempt to reproduce the problem (for example, by copying a file to a USB hard disk or connecting a video camera) If you are troubleshooting performance problems, right-click the Performance Monitor display and click Clear immediately after you begin using the device to ensure the counters include only data created during your test The longer you allow the test to run, the more accurate it will be You should stop Performance Monitor before your test ends After reproducing the problem, pause Performance Monitor by clicking the Freeze Display button on the toolbar or by pressing Ctrl+F Because you added performance counters for all instances, you probably have a large number of counters To browse individual counters to identify the specific source of your problems, press Ctrl+H to enable highlighting Click the first counter in the list .

After you select a counter, the graph related to that counter will be shown in bold Examine the values for that particular counter If the counter shows an error, make note of the USB controller and device causing the problem Press the down arrow on your keyboard to select the next counter and continue analyzing USB performance values USB errors should not occur under normal circumstances; however, Windows can automatically recover from many USB errors without affecting the user After you identify the source of the USB problems, follow the steps in the section titled How to Solve USB Driver and Hardware Problems earlier in this chapter If you are troubleshooting USB performance problems, examine the Bulk Bytes/Sec counter to identify the instance that relates to the device you are using Then select the counter and make note of the Average value Theoretically, USB 2 .

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0 can transfer a maximum of 60,000,000 bytes/sec However, this theoretical maximum will never be realized More realistically, you might be able to achieve half that value USB storage devices are often much slower, and performance will vary depending on the performance of the device itself USB hard disks typically average less than 10,000,000 bytes/sec but can peak over 20,000,000 bytes/sec Performance of hard disks will also vary depending on the portion of the disk being written to or read from, the size of the files being accessed, and the disk fragmentation For more information on using Performance Monitor, see 21 ..

Connecting a USB device to a computer can include several different layers:

Therefore, it is possible that at the time of the crash, the paging file is too small to hold a kernel dump. If you want to see the size of a kernel dump on your system, force a manual crash either by configuring the option to allow you to initiate a manual system crash from the console or by using the Notmyfault tool described later in this chapter. (Both these approaches are described later in the chapter.) When you reboot, you can check to make sure that a kernel dump was generated and check its size to gauge how large to make your boot volume paging file. To be conservative, on 32-bit systems you can choose a page file size of 2 GB plus up to 356 MB, because 2 GB is the maximum kernel-mode address space available (unless you are booting with the 3gb and/or userva boot options, in which case this can be up to 3 GB). If you do not have enough space on the boot volume for saving the memory.dmp file, you can choose a location on any other local hard disk through the dialog box shown in Figure 14-4.

A USB host controller, which is connected directly to your computer USB host controllers are often built into the computer s motherboard, but you can add them by

using an internal adapter or a PC card . If the name of the controller includes the word Enhanced, the controller supports USB 2 .0 .

A USB root hub, which is connected directly to the USB host controller Typically, USB root hubs are built into the same device that contains the USB host controller your computer s motherboard or an adapter card . Optionally, additional USB hubs that connect to the USB root hub to create additional USB ports USB hubs can be external devices that you add, they can be an internal device within a computer, or they can be built into a docking station .

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