If your computer doesn't recognize your connected device, you might see an unknown error or a '0xE' error. If you do, follow these steps and try to connect your device again after each step:

• Drivers Sdt Usb Devices Dongle
• Kinds Of Usb Devices

Feb 18, 2015 Method 3 – Restart & Disconnect USB Devices. The next thing you can try is to disconnect all USB devices and then restart the machine. Once you have restarted, try to connect the USB device that was causing the problem. If that particular USB port doesn’t recognize it, try another one.

1. Fix USB Drivers using Device manager. View our post on fixing USB Driver issues in Windows 8. Go to Menu Run; Type device manager in the text box; Select Device Manager; Find Universal Serial Bus controllers and expand the list; Right-click Unknown Device; Select Properties from the context-sensitive menu; Select Drivers; Click Update Driver.
2. From desktop to critical infrastructure, Tripp Lite products and solutions power and connect the computers, networking equipment and electronic devices that form the foundation of our digital world. Headquartered in Chicago since 1922, Tripp Lite has offices and partners worldwide.
3. USB Ethernet/RNDIS Gadget (Remote Network Driver Interface Specification (RNDIS) is a Microsoft proprietary protocol used mostly on top of USB. It provides a virtual Ethernet link to most versions of the Windows, Linux and OS X operating systems. To the host, the usb device acts as an external Ethernet card).

1. Make sure that your iOS or iPadOS device is unlocked and on the Home screen.
2. Check that you have the latest software on your Mac or Windows PC. If you're using iTunes, make sure you have the latest version.
3. Make sure that your device is turned on.
4. If you see a Trust this Computer alert, unlock your device and tap Trust.
5. Unplug all USB accessories from your computer except for your device. Try each USB port to see if one works. Then try a different Apple USB cable.*
6. Restart your computer.
7. Restart your device:
8. Try connecting your device to another computer. If you have the same issue on another computer, contact Apple Support.
   

For more help, follow the steps below for your Mac or Windows PC.

* Learn how to connect iPad Pro (11-inch) or iPad Pro 12.9-inch (3rd generation) to your computer.

If you use a Mac

1. Connect your iOS or iPadOS device and make sure that it's unlocked and on the Home screen.
2. On your Mac, hold down the Option key, click the Apple menu, and choose System Information or System Report.
3. From the list on the left, select USB.
4. If you see your iPhone, iPad, or iPod under USB Device Tree, get the latest macOS or install the latest updates. If you don't see your device or still need help, contact Apple Support.
   

If you use a Windows PC

The steps differ depending on if you downloaded iTunes from the Microsoft Store or from Apple.

If you downloaded iTunes from the Microsoft Store

Follow these steps to reinstall the Apple Mobile Device USB driver:

1. Disconnect your device from your computer.
2. Unlock your iOS or iPadOS device and go to the Home screen. Then reconnect your device. If iTunes opens, close it.
3. Click and hold (or right-click) the Start button, then choose Device Manager.
4. Locate and expand the Portable Devices section.
   
5. Look for your connected device (such as Apple iPhone), then right-click on the device name and choose Update driver.
   
6. Select 'Search automatically for updated driver software.'
7. After the software installs, go to Settings > Update & Security > Windows Update and verify that no other updates are available.
8. Open iTunes.

If you downloaded iTunes from Apple

Follow these steps to reinstall the Apple Mobile Device USB driver:

1. Disconnect your device from your computer.
2. Unlock your iOS or iPadOS device and go to the Home screen. Then reconnect your device. If iTunes opens, close it.
3. Press the Windows and R key on your keyboard to open the Run command.
4. In the Run window, enter:
   %ProgramFiles%Common FilesAppleMobile Device SupportDrivers
5. Click OK.
6. Right-click on the usbaapl64.inf or usbaapl.inf file and choose Install.
   You might see other files that start with usbaapl64 or usbaapl. Make sure to install the file that ends in .inf. If you’re not sure which file to install, right-click a blank area in the File Explorer Window, click View, then click Details to find the correct file type. You want to install the Setup Information file.
7. Disconnect your device from your computer, then restart your computer.
8. Reconnect your device and open iTunes.

If your device still isn't recognized

Check Device Manager to see if the Apple Mobile Device USB driver is installed. Follow these steps to open Device Manager:

1. Press the Windows and R key on your keyboard to open the Run command.
2. In the Run window, enter devmgmt.msc, then click OK. Device Manager should open.
3. Locate and expand the Universal Serial Bus controllers section.
4. Look for the Apple Mobile Device USB driver.
   

If you don't see the Apple Mobile Device USB Driver or you see Unknown Device:

• Connect your device to your computer with a different USB cable.
• Connect your device to a different computer. If you have the same issue on another computer, contact Apple Support.

If you see the Apple Mobile Device USB driver with an error symbol:

If you see , , or next to the Apple Mobile Device USB driver, follow these steps:

1. Restart the Apple Mobile Device Service.
2. Check for and resolve issues with third-party security software, then restart your computer.
3. Try to install the usbaapl64.inf or usbaapl.inf file again.

Device Drivers for Windows NT 4.0

Installing the SDMS™ Windows NT Drivers:
SYMC8XX.SYS, SYM_HI.SYS, and SYM_U3.SYS

This document provides installation instructions and includes these topics:

Windows NT 4.0 is an operating system designed to run on processors using current technology. It provides a graphical user interface environment incorporating many high-level features, which are described in the Microsoft Windows NT documentation. An I/O manager handles I/O requests in Windows NT. To address a SCSI peripheral, the I/O manager goes through the appropriate drivers. Windows NT provides class drivers for hard disk, floptical, CD-ROM, printer, and scanner peripherals.

Other class drivers, provided by peripheral manufacturers, may be added to support new devices. Tape device support is built into the operating system itself and does not require a class driver. Microsoft provides the port driver and LSI Logic provides the miniport drivers, which are called SYMC8XX.SYS, SYM_HI.SYS, and SYM_U3.SYS. These drivers complete the path to an LSI Logic SCSI controller or processor with an optional SDMS SCSI BIOS. The following sections describe these drivers and their installation.

SDMS drivers contain the same filename for different Windows operating systems. The driver files are packaged either in separate subdirectories based on the Windows operating system or on different flex disks. To determine the driver file for Windows NT 4.0, note that the filename ends with .SYS. For example, SYMC8XX.SYS.

To determine the operating system version, go into Windows Explorer, display the driver file, right click on the filename, click on Properties, and click on the Version tab. Finally, click on the Internal Name in the lower section. For Windows NT 4.0, the filename appears as filename (NT 4.0). For example, SYMC8XX.SYS (NT 4.0).

Note: Current Windows NT 4.0 drivers can be downloaded from the LSI Logic web site at http://www.lsilogic.com. After you are connected to this web site, place your cursor on the Get Drivers option in the menu bar. Click on the Drivers selection. Choose the Windows NT operating system for SCSI and click on the Go button. Follow the instructions on subsequent screens to download the drivers.
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The SDMS device drivers for Windows NT 4.0 support these features:

• Synchronous negotiation (including Fast SCSI/Ultra SCSI/Ultra2 SCSI)
• Ultra160 data transfers (for LSI53C1010)
• Domain Validation (for SYM_U3.SYS driver only)
• Parallel Protocol Request (for SYM_U3.SYS driver only)
• Cyclic Redundancy Check (for SYM_U3.SYS driver only)
• Wide negotiation
• Tagged command queuing
• Multiple host adapters
• Multiple Logical Unit Numbers (LUNs)
• Disconnect/Reselect
• Scatter/Gather
• Differential support
• SCSI pass-through functionality
• Disk array configurations with no LUN 0
• Disk array configurations with non-contiguous LUNs
• Target-initiated negotiation support
• Auto request sense
• Maximum block size support: NT 4.0 - 1 Mbyte
• NVRAM support (wide/sync parameters, SCSI Host ID)

All LSI Logic devices and host adapters have undergone a name change. They have transitioned from a SYM prefix to an LSI prefix. No name changes have occurred for the SDMS Windows NT 4.0 drivers.

The SYMC8XX.SYS driver is named 'Symbios PCI (53C8XX)' for driver installation. This driver supports the following devices and their associated LSI Logic host adapters:

• LSI53C810, LSI53C810A, LSI53C810AE (LSI8100S, LSI8100ASP)
• LSI53C815 (LSI815XS, LSI8150SP)
• LSI53C825, LSI53C825A (LSI8250S, LSI8251S, LSI8251D, LSI8250ASP, LSI8251ASP, LSI8251AD)
• LSI53C860, LSI53C860AE (LSI8600SP)
• LSI53C875, LSI53C875E (LSI8750SP, LSI8751SP, LSI8751SPE, LSI8751D)
• LSI53C876 (LSI22801, LSI22802)
• LSI53C885
• LSI53C895 (LSI8951U, LSI8952U)

The SYM_HI.SYS driver is named 'Symbios PCI High Performance Driver' for driver installation. This driver supports the following devices and their associated LSI Logic host adapters:

• LSI53C896 (LSI22910, LSI21002, LSI22902)
• LSI53C895A (LSI8953U)

The SYM_U3.SYS driver is named 'Symbios Ultra3 PCI SCSI Driver' for driver installation. It supports the following device and its associated LSI Logic host adapters: LSI53C1010 (LSI8955U, LSI21040, LSI22903, LSI22915).

The SDMS Software Device Drivers and Utilities CD-ROM contains the miniport drivers in this directory:

{CD-ROM Drive Letter}:DRIVERS8XX-1010WINNTXXXXXI386WINNTMINIPORT

where XXXXX represents the specific Windows NT 4.0 subdirectory. For example, the 8XXNT subdirectory contains the SYMC8XX.SYS driver.

Copy all the files starting from the I386 subdirectory through the MINIPORT subdirectory to the root directory of a clean diskette. Use this SDMS driver diskette during installation.

or

Use the self-extracting image files for Windows NT 4.0 drivers.

For the SYMC8XX.SYS driver, locate the executable file at:

{CD-ROM Drive Letter}:DISKIMAGNT8XX.EXE

For the SYM_HI.SYS driver, locate the executable file at:

{CD-ROM Drive Letter}:DISKIMAGNT_HI.EXE

For the SYM_U3.SYS driver, locate the executable file at:

{CD-ROM Drive Letter}:DISKIMAGNT_U3.EXE

or

Perform the Guided Installation Using this CD-ROM.

SYMC8XX.SYS, SYM_HI.SYS, and SYM_U3.SYS meet the Microsoft specification for miniport drivers. These miniport drivers allow connection of SCSI devices including disk drives, CD-ROMs, and tape drives for PCI-based machines. To support a new SCSI device, the Windows NT architecture requires that a class driver for that type device be present (usually supplied by Microsoft, or possibly by the peripheral manufacturer). No changes to SYMC8XX.SYS, SYM_HI.SYS or SYM_U3.SYS are required. These drivers are only supported under Windows NT 4.0. They do not run under earlier versions of Windows NT.

A Windows application passes SCSI commands directly to the SCSI devices by using the SCSI pass-through facility (refer to the Microsoft Windows NT documentation for details). This facility allows applications to directly control and access SCSI devices by filling in a data structure and calling in to the port driver.

The SYMC8XX.SYS and SYM_HI.SYS drivers support Ultra SCSI protocol, providing twice the raw data transfer rate of Fast SCSI for disk drives and LSI Logic host adapters that support Ultra SCSI. These drivers also support Ultra2 SCSI protocol, providing quadruple the raw data transfer rate of Fast SCSI. The SYM_U3.SYS driver supports Ultra160 SCSI protocol providing 80 Mbytes/s of data transfer and up to 160 Mbytes/s data transfer for double transition.

Caution: Ultra SCSI requires more stringent SCSI bus cabling setups than Fast SCSI. Ultra2 and Ultra160 require Low Voltage Differential (LVD) termination.

Note: The LSI Logic bundled driver in Windows NT 4.0 is named SYMC810.SYS. When Windows NT selects the bundled driver during setup, Symbios C810 PCI SCSI Host Adapter appears, which is the driver information. Although this implies that the driver only supports the LSI53C810, it actually supports the LSI53C810, LSI53C810A, LSI53C815, LSI53C825, LSI53C825A, LSI53C860, LSI53C875, and LSI53C876. This bundled driver does not see or support the LSI53C885, LSI53C895, LSI53C896, LSI53C895A, and LSI53C1010 and any newer host adapters that LSI Logic currently produces. Keep in mind that Windows NT 4.0 setup only displays the driver information, not every controller found by that driver.

Installing the SYMC8XX.SYS/SYM_HI.SYS/SYM_U3.SYS Drivers

This procedure installs the SYMC8XX.SYS, SYM_HI.SYS, or SYM_U3.SYS driver onto a Windows NT 4.0 system. Use this procedure when installing Windows NT 4.0 onto an unused SCSI drive. Windows NT automatically adds the driver to the registry and copies the driver to the appropriate directory.

Choose the appropriate method to install these drivers onto a Windows NT 4.0 system.

1. Boot directly from the Windows NT CD-ROM.

or

2. Use Windows Boot Diskettes.

Different steps are required depending on the method used. For Compaq/DEC systems based on the Alpha processor, CD-ROM installation is the only method available. The CD-ROM Installation and Boot Disk Installation procedures are listed below. Select the appropriate installation for your system.

CD-ROM Installation

The driver that is bundled with Windows NT 4.0 is SYMC810.SYS. This driver supports controllers that are listed in the section above. In that case, proceed to step 2.

1. Have the SDMS driver diskette available for insertion into the A: drive when prompted.

Important: Read steps 2 and 3 before performing the instructions contained within these steps.

2. Start the Windows NT installation by booting from the Windows NT CD-ROM:

For Intel-based systems, the system BIOS must support booting from a CD-ROM. SDMS BIOS settings may need to be changed to allow CD-ROM booting.

For Alpha-based systems, from the firmware Boot menu, select the Supplementary menu, then select Install Windows NT from the CD-ROM.

3. Press the F6 key when the screen displays Windows NT Setup. This must be done or else the new driver installed from the SDMS driver diskette will not be recognized.

Note: Be sure to press the F6 key as any driver loaded later in the installation process is not recognized by the Windows setup. If F6 is not pressed, all devices controlled by the drivers are not available during Windows NT setup.

4. Choose S to specify an additional device when the screen displays:

Simxperience port devices driver. Setup could not determine the type of one or more mass storage devices..

Note: If this screen is not displayed as the first user input, then the F6 key press was not seen by the setup program. Reboot the system and try again.

The system prompts for the manufacturer-supplied hardware support disk.

5. Insert the appropriate SDMS driver diskette containing the Windows NT driver required to support your LSI Logic adapter(s) and press Enter.

Current Windows NT 4.0 drivers can be downloaded from the LSI Logic web site at http://www.lsilogic.com. After you are connected to this web site, place your cursor on the Get Drivers option in the menu bar. Click on the Drivers selection. Choose the Windows NT operating system for SCSI and click on the Go button. Follow the instructions on subsequent screens to download the drivers.

6. Depending on the driver being installed, either 'Symbios PCI (53C8XX), Symbios PCI High Performance Driver, or Symbios Ultra3 PCI SCSI Driver' is shown highlighted. Press Enter to proceed.

Note: If more than one SDMS driver needs to be installed, they can be installed one after the other using steps 4 through 6. Installation order is not important.

7. Windows NT should now recognize the miniport driver(s) and the SCSI hardware. Press Enter to continue.
   

8. Follow the Microsoft Windows NT installation procedure at this point.

Boot Diskette Installation

The driver that is bundled with Windows NT 4.0 is SYMC810.SYS. This driver supports controllers that are listed in the description section above. If the bundled driver will support the LSI Logic chip which is being used, please skip to step 3.

1. Have the SDMS driver diskette available for insertion into the A: drive when prompted.

2. Start the Windows NT installation by booting from the Microsoft Setup diskette.

3. Press Enter when the Welcome to Setup screen appears. The Windows NT Workstation Setup window appears next.

4. Press S to skip automatic detection and do manual selection. A screen displays the message :

Setup has recognized the following mass storage devices in your computer..

5. Choose S to configure additional SCSI adapters when a screen displays the SCSI adapters found.

6. Move the highlight bar to Other and press Enter.

The system prompts for the manufacturer-supplied hardware support disk.

7. Insert the appropriate SDMS driver diskette containing the Windows NT driver required to support your LSI Logic adapter(s) and press Enter.

Note: If more than one SDMS driver needs to be installed, they can be installed one after the other using steps 7 through 10. Installation order is not important.

8. Depending on the driver being installed, either 'Symbios PCI (53C8XX), Symbios PCI High Performance Driver, or Symbios Ultra3 PCI SCSI Driver' is shown highlighted. Press Enter to proceed.

The Windows NT Workstation Setup window reappears.

9. Press S to load additional drives if using an IDE CD-ROM for installation. Another window appears. Scroll up and select:

IDE CD-ROM (ATAPI 1.2/PCI IDE Controller)

Press Enter.

or

If you have completed configuring additional SCSI adapters, press Enter.

10. Press Enter to continue.

11. Follow the Microsoft Windows NT installation procedure at this point.

This procedure installs the SYMC8XX.SYS, SYM_HI.SYS or SYM_U3.SYS driver onto an existing Windows NT system.

Note: Windows NT 4.0 uses the Windows 95/98 user interface, resulting in minor changes to the procedure for updating SCSI drivers.

1. Boot Windows NT and log on as Administrator.

2. Click on the Start button. Select Settings-->Control Panel.

3. Double click on SCSI Adapters.

4. Click the Drivers tab. If NCRSDMS.SYS, NCRC810.SYS, NCRC8XX.SYS, or SYMC810.SYS drivers are listed, select the driver(s) and choose Remove before adding the new driver. If the driver name of the driver you are installing (SYMC8XX.SYS, SYM_HI.SYS or SYM_U3.SYS) is listed, remove it before adding the new driver.

5. Select OK when the Remove Driver message prompts:

Are you sure you want to remove this driver?

Another message may display stating:

The SCSI Adapter has been marked as a boot device ..

6. Click OK.

7. Click Add. A list of installed adapters will appear.

8. Click the Have Disk button.

The system prompts for the manufacturer-supplied hardware support disk.

9. Insert the appropriate SDMS driver diskette containing the Windows NT driver required to support your LSI Logic adapter(s). The path to copy manufacturer's files is:

A:WINNTMINIPORT

and select OK.

10. Depending on the driver being installed, either 'Symbios PCI (53C8XX), Symbios PCI High Performance Driver, or Symbios Ultra3 PCI SCSI Driver' is shown highlighted on the Install Driver menu. If it is not highlighted, select it. Choose OK. At this point, the following message may appear:

The driver(s) for this SCSI Adapter are already on the system. Do you want to use the currently installed driver(s) or install new one(s)?

Note: Selecting Current uses the driver already on the system, and selecting New uses the driver on the diskette. Unless you want to use the older version already on the system, choose New. If you choose Current, go to step 12.

For the path to the OEM SCSI Adapter files, A:WINNTMINIPORT should be displayed.

11. Select Continue. Then remove the diskette from your A: drive.

The System Settings Change message displays:

You must restart your computer before the new settings take effect. Do you want to restart your computer now?

12. Click on the Yes button to restart and reboot Windows NT. If you choose Cancel, remember that you must restart before the new driver will load.

Note: If more than one SDMS driver needs to be installed, they can be installed one after the other without rebooting for each one. Installation order is not important.

13. Reboot your system to load the new miniport driver(s).

Performance Tuning for Windows NT 4.0

Windows NT 4.0 has registry entries that can be used to increase the performance of SCSI I/O for certain configurations. The tunable parameters are large transfer block size support and a guaranteed number of concurrent I/Os for a particular SCSI bus.

The SYMC8XX.SYS, SYM_HI.SYS, and SYM_U3.SYS drivers can support up to a 1 Mbyte transfer size in Windows NT 4.0. In Windows NT 4.0 the default transfer size is 64 Kbytes. To enable a larger transfer size, an entry must be added to the registry by using the file SYM_256K.REG. This file will set a 256 Kbytes maximum, but it can be edited to set other desired maximum transfer sizes.

Important: Be sure to read the information in the SYM_256K.REG data file before editing it.

Choose one of two methods to add this registry setting:

1. Locate the SYM_256K.REG data file (supplied with the driver files) using Windows Explorer and double click on the file.

or

2. Type at the command prompt:
   REGEDIT SYM_256K.REG

Both methods insert an entry into the registry to enable 256 Kbytes block size support.

Editing the SYM_256K.REG file can set any maximum block size between 64 Kbytes and 1 Mbyte (-8 Kbytes). The formula to calculate the proper value for MaximumSGList is:

MaximumSGList = (Maximum Block Size)/4K +1

For 256 Kbytes: 256 Kbytes/4 Kbytes = 64, add 1 for 65 (decimal) or 0x41(hexadecimal). The maximum value allowed for MaximumSGList is 255 or 0xFF. This denotes an absolute maximum transfer size of 1040384, which is 8 Kbytes less than 1 Mbyte (1040384/4K = 0xFE, add 1 for 0xFF or 255).

The system must be rebooted for the new registry setting to be effective.

To reset the maximum block size to the default of 64 Kbytes, follow the instructions above, and use SYMDFBLK.REG as the data file.

Windows NT 4.0 only guarantees a maximum of 32 concurrent I/Os active on a particular SCSI bus. However, due to the method of memory allocation, the actual limit of concurrent I/Os can vary greatly between various drivers or versions of drivers. This can have a huge impact on performance benchmarking between different driver versions or adapter vendors. This means that one adapter may actually be able to have 70 or 80 I/Os outstanding, while another adapter could only have 32. This can affect systems with high performance storage subsystems, such as disk arrays.

In order to have a guaranteed number of concurrent I/Os, an entry must be added to the registry, using the file SYM100IO.REG (SYMC8XX.SYS, SYM_HI.SYS or SYM_U3.SYS). Be sure to read the information in the SYM100IO.REG data file before editing it.

Choose one of two methods to add this registry setting:

1. Locate the SYM100IO.REG data file (supplied with the driver files) using Windows Explorer and double click on the file.
   or
   

2. Type at the command prompt:

REGEDIT SYM100IO.REG

This inserts an entry in the registry to guarantee a maximum of 100 concurrent I/Os per adapter.

If a maximum other than 100 is desired, the SYM100IO.REG file can be edited. The system administrator should be aware that increasing the number of concurrent I/Os from the default of 32 will use increasing amounts of non-paged pool memory. High values for this setting can degrade system performance. The system must be rebooted for the new registry setting to be effective.

To reset the guaranteed number of concurrent I/Os to the default of 32, follow the instructions above, and use SYMDEFIO.REG as the data file.

Enabling and Disabling Auto Request Sense is found in the Troubleshooting section under the problem The SCSI device does not install or operate correctly.

Note: This section applies only to Intel x86-platforms where the SDMS 4.XX PCI SCSI BIOS is used.

The SDMS 4.XX PCI SCSI BIOS loads only one image into system memory at boot time regardless of how many host adapters are used in the system. All of the disk drives on all host adapters will be recognized through the INT13h function call. Because of this implementation, disk mirroring under Windows NT needs to be done. This must be done so that you can boot from the mirrored partition in case the primary partition fails.

To create a Windows NT Fault Tolerant (FT) diskette, follow these instructions:

1. Format a diskette in drive A: using Windows NT (File Manager or Windows Explorer) for use as a FT boot diskette.

2. From the root directory of the primary partition, copy NTLDR, NTDETECT.COM, and BOOT.INI to this diskette.

3. Temporarily remove the read-only attribute of the BOOT.INI file so that it can be modified and saved.

4. Edit BOOT.INI on the FT diskette and modify the following line where you want to boot the mirrored partition.

multi(0)disk(0)rdisk(x)partition(y)<winnt_directory>

Where:

multi(0) and disk(0) should always remain same.

x = the drive number of the mirrored partition in the INT13h chain minus 80h.

The drive number of the mirrored partition can be found during system bootup of the SDMS 4.XX PCI SCSI BIOS when the primary partition does not exist. It should say either BOOT (=80h), 81h, 82h, and higher. Therefore the value of x would be 0 when BOOT, 1 when 81h, 2 when 82h, etc.

y = the partition number on the drive (starts at 1 which equals single partition on the drive).

For example, let's say there are two LSI Logic host adapters in the system. The first one, #0 which is the boot path, has two SCSI hard drives on ID 0 and ID 5. The second host adapter, #1, has two SCSI hard drives on ID 2 and ID 4. Assuming that the SCSI bus scan starts from ID 0 and goes up, the drive number of INT13h will look like this:

Host Adapter #0, ID 0= BOOT (which is 80h)
Host Adapter #0, ID 5= 81h
Host Adapter #1, ID 2= 82h
Host Adapter #1, ID 4= 83h

Now Windows NT is installed on the boot drive, host adapter #0 ID 0, and a mirrored partition is established on host adapter #1 ID 2. If the primary partition fails, for example due to power failure, then the drive number of INT13h will change:

Host Adapter #0, ID 5= BOOT (which is 80h)
Host Adapter #1, ID 2= 81h
Host Adapter #1, ID 4= 82h

Therefore, the following line should be used in the BOOT.INI on the NT Fault Tolerant boot diskette to boot from the mirrored partition, host adapter #1 ID 2. Note that rdisk(1) was calculated from x=81h - 80h.

multi(0)disk(0)rdisk(1)partition(1)<winnt_directory>

5. Save the BOOT.INI file and restore the read-only attribute.

Some potential problems and their suggested solutions are:

Problem: During installation, no SCSI devices are found.

Solution:

1. Ensure that Custom Setup is chosen on the Setup Method screen.

2. Ensure that all devices are powered on and terminated correctly.

3. Check that no devices have duplicate SCSI IDs.

4. Make sure INT A is assigned for the PCI slot(s) where your SCSI host adapter(s) is installed.

5. Ensure that all devices can be seen in the display banner of the SDMS SCSI BIOS at boot time.

6. For systems with some Award BIOS, ensure that the PCI IRQ is set to edge triggered.

Problem: System crashes during installation with a message indicating inaccessible boot device.

Solution:

1. This error is usually associated with an IRQ, DMA channel, I/O (chip) address, or BIOS address conflict. Set the SCSI host adapter to use a different interrupt.
   

2. A virus that infects the Master Boot Record of the boot device sometimes causes this error. Use a write-protected DOS bootable diskette containing virus scanning and cleaning software to check for any viruses on the boot device, and remove any viruses that are found.

Problem: A disk drive is recognized as seven different devices when only one is physically connected to the SCSI bus.

Solution:

1. Older SCSI devices that incorrectly indicate to Windows NT that they support multiple LUNs usually cause this error. Contact the device manufacturer for a firmware upgrade.

2. Ensure that there are no devices with the same SCSI ID as the host adapter board.

Problem:The SCSI device does not install or operate correctly.

Solution:

1. If a SCSI device is not operating properly (either the device is not found or a SCSI interface error occurs during scanning), it is possible that the third-party device drivers do not support the auto request sense feature of LSI Logic host adapters. Disable the auto request sense feature as described below and try the device operation again.
   

2. Using the file SYMNO_AR.REG (supplied with the SDMS driver files for Windows NT), either double click on the file in Windows Explorer or File Manager or type:
   REGEDIT SYMNO_AR.REG
   at the command prompt. This inserts a registry entry that disables the auto request sense feature. The system must be rebooted for this change to take effect.
   

Drivers Sdt Usb Devices Dongle

3. To re-enable the auto request sense feature, use the file SYM_AUTO.REGand perform one of the update methods in step b above.

Problem: Problems with certain SCSI devices when using an Ultra SCSI adapter.

Solution:

Some SCSI devices do not function properly when the adapter attempts to negotiate Ultra SCSI transfer rates. If a device is not operating properly, check the transfer speed setting using the SDMS 4.XX PCI BIOS Configuration Utility (press Ctrl-C when the LSI Logic PCI BIOS banner appears during the system boot process). Devices that do not support Ultra SCSI should be set to a maximum of 10 Mbytes/s for narrow (8 bits), 20 Mbytes/s for wide (16 bits).

Problem: Problems with Ultra SCSI devices using Ultra SCSI protocol.

Solution:

1. If the system is configured with a LSI Logic host adapter that supports Ultra SCSI and an Ultra SCSI device is on the SCSI bus, intermittent problems and possible system crashes can occur if the SCSI bus cable and terminators do not conform to the Ultra SCSI specification.

2. Disable Ultra SCSI support for all devices via the SDMS 4.XX PCI BIOS Configuration Utility (press Ctrl-C when the LSI Logic PCI BIOS banner appears during the system boot process).

3. If the system operates properly without Ultra SCSI enabled, it is highly likely that the SCSI bus cable and terminators are not configured correctly for Ultra SCSI. See the LSI Logic host adapter user's guide for information on Ultra SCSI cabling requirements.

Problem: At Ultra3 speed (160 Mbytes/s) system hangs (waits forever), has long boot time, or SCSI device is not available.

Some older SCSI devices do not tolerate Domain Validation operations. At system boot time, Domain Validation is performed to test the data integrity of the SCSI bus between the host adapter and each target device. With some older SCSI devices, these operations can cause the device to stop responding to SCSI commands.

Solution:

Disable Domain Validation, either for a specific SCSI target or all adapters controlled by the driver.

1. To disable Domain Validation for a specific SCSI target, use the SDMS 4.XX PCI SCSI BIOS Configuration Utility to set the Sync Rate to 0 (async) and the Data Width to 8. This target will be running async/narrow mode and no Domain Validation operations will be performed on it.

2. To disable Domain Validation for all host adapters controlled by this driver, use the file SYMNO_DV.REG (supplied with the SDMS driver files for Windows NT). Either double click the file in Windows Explorer or File Manager or type:

REGEDIT SYMNO_DV.REG

at the command prompt. This inserts a registry entry that disables Domain Validation operations. The system must be rebooted for this change to take effect.

Kinds Of Usb Devices

3. To re-enable the Domain Validation feature, use the file SYM_DOMV.REG and perform one of the update methods described in the preceding paragraph.

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