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If the driver continues to receive time-out or CRC errors, the driver eventually reduces the transfer mode to the slowest mode PIO mode.. DMA mode allows the processor to transfer large pieces of data with very little software overhead - therefore requiring low CPU utilization. In this mode, high speed burning can be performed in background with other programs running.
Double-click Administrative Tools, and then click Computer Management. You can select one or several drivers from the list and switch the status using the two buttons under the list. You can also right-click a driver name to display the context menu, which lets you perform state toggling.
In the bottom of the dialog box, you can specify additional drivers separated by spaces that you want verified after the next restart. You typically use this edit control when you want to install a new driver that is not already loaded.
If the radio button group on the top of the list is set to Verify all drivers, the list and the Verify and Don't Verify buttons and the edit control are unavailable. This means that after the next restart, all the drivers in the system are verified. You can set the verification type using the check boxes in the upper-right area of the dialog box. Level 2 verification is stronger than level 1. You must save any modification to the settings by clicking Apply. There are two more buttons in this page:.
You can use this property page to change the Driver Verifier flags immediately. You can only toggle the state of some of the Driver Verifier flags and you cannot change the list of the drivers that are being verified. After you change the status of some check boxes, you must click Apply for the changes to take effect. The changes take effect immediately and they last until you make additional changes or until you restart the computer. You can also run Verifier. Multiple switches can be used on the command line, for example: Verifier.
Standard Flags:. Replace the value parameter with one of the following verification bit values:. This command specifies the specific driver or drivers to verify. Provide additional drivers in a space-separated list. Configuring using Volatile mode:. Changes verifier flags immediately, and adds MyDriver1. Querying current Verifier Statistics:. Dump the current Driver Verifier status and counters to the standard output. Querying current Verifier Settings:. Dump the current Driver Verifier settings to the standard output.
Clearing Verifier Settings:. The sections that follow describe additional details about driver verifier settings that may be of interest to driver developers. These settings are not generally required by IT professionals. Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly.
Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:. For example, if you have a video card that has MB of onboard memory, that memory must be mapped within the first 4 GB of address space.
If 4 GB of system memory is already installed, part of that address space must be reserved by the graphics memory mapping. Graphics memory mapping overwrites a part of the system memory. These conditions reduce the total amount of system memory that is available to the operating system. The reduction in available system memory depends on the devices that are installed in the computer.
However, to avoid potential driver compatibility issues, the bit versions of Windows Vista limit the total available memory to 3. See the "More information" section for information about potential driver compatibility issues. If a computer has many installed devices, the available memory may be reduced to 3 GB or less.
However, the maximum memory available in bit versions of Windows Vista is typically 3. For Windows Vista to use all 4 GB of memory on a computer that has 4 GB of memory installed, the computer must meet the following requirements:. The chipset must support at least 8 GB of address space. Chipsets that have this capability include the following:. The CPU must support the x64 instruction set. The BIOS must support the memory remapping feature.
The memory remapping feature allows for the segment of system memory that was previously overwritten by the Peripheral Component Interconnect PCI configuration space to be remapped above the 4 GB address line. This feature must be enabled in the BIOS configuration utility on the computer. View your computer product documentation for instructions that explain how to enable this feature. Many consumer-oriented computers may not support the memory remapping feature.
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