ExpressPCI Windows Registry Settings
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CAUTION - Modifying your registry incorrectly may result in making your machine
unbootable. Please use care in editing the registry. This should only be
performed by users experienced with the registry editor.
NOTE - Some of the following requires knowledge of hexadecimal arithmetic and
a sense for basic SCSI command processing. For most users, the defaults
set by the adapter driver installation .INF file will suffice. "If it ain't
broke, don't fix it!"
The following registry entries are located in the registry key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Express2\Parameters\ATTO:
PCILatency - Specifies the PCI Latency Timer value in units of PCI
bus clocks. Values can range from 1 - 248 (0x01 - 0xf8).
The default value is 248.
NumberOfRequests - Specifies the number of buffers the driver allocates
per adapter channel to process SCSI commands. Values
can range from 256 - 2048 (0x100 - 0x800). The default
value is 512. Increasing this value may improve
performance when doing heavy I/O to several devices on
one channel. However, the memory is allocated from
non-paged memory, a critical resource for Windows.
NumberOfReplies - Specifies the number of buffers the driver allocates
per adapter channel to process unsuccessful SCSI commands.
Values can range from 16 - 128 (0x10 - 0x80). The
default value is 16 (one per target ID).
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Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.