What should I do if my Iomega® USB Hard Drive is not assigned a drive letter or is not detected in Windows® 98/98SE?
Document # 11305.html

Please use the following steps if a drive letter is not automatically assigned to the Iomega® USB Hard Drive or if the drive is not detected in Windows® 98/98SE.


STEP ONE - Check all connections
  1. Unplug the USB data cable from the drive and the computer.

  2. Check the ends of the USB data cable to ensure that they are not damaged.

  3. Reconnect the USB data cable to the drive and the computer. Check the connections to ensure that they are secure.

  4. Check the power supply connections to the drive and power outlet to ensure that they are secure.

  5. Restart the computer.

  6. Double-click the My Computer icon to see if the Iomega Hard Drive is detected.

    If the Iomega Hard Drive is detected, you can now use the drive.

    If the Iomega Hard Drive is not detected, please try another USB cable and/or power supply (if available). If the Iomega Hard Drive is still not detected, continue with the next step.


STEP TWO - Ensure that the Iomega USB Mass Storage driver is loaded
  1. Insert the Iomega Hard Drive's software CD into the CD-ROM drive.

  2. A message should appear stating that a Windows 98 Mass Storage driver is installing. Click Continue to install the driver.

  3. Restart the computer.

  4. Double-click the My Computer icon to see if the Iomega Hard Drive is detected.

    If the Iomega Hard Drive is detected, you can now use the drive.

    If the Iomega Hard Drive is not detected, please continue with the next step.


STEP THREE - Manually assign a drive letter to the Iomega Hard Drive
  1. Right-click the My Computer icon and select Properties.

  2. Click the Device Manager tab.

  3. Click the plus (+) sign next to Disk drives.

  4. Double-click the icon for the Iomega Hard Drive.

    Important: Windows may report the Iomega Hard drive as a generic Local Disk and a non-Iomega drive string may be present. For more information, please go to http://www.iomega.com/support/documents/11273.html

  5. Click the Settings tab.

  6. Under the Options section, click Removable to place a check mark in the box.

  7. Locate the Reserved drive letters section and in the Start drive letter box, select an unused drive letter from the drop-down menu.

  8. In the End drive letter box, select the same drive letter from the drop-down menu.

  9. Restart the computer.

  10. Once the computer restarts, right-click the My Computer icon and select Properties.

  11. Click the Device Manager tab.

  12. Click the plus (+) sign next to Disk drives.

  13. Double-click the icon for the Iomega Hard Drive.

  14. Click the Settings tab.

  15. Under the Options section, click Removable to remove the check mark in the box.

  16. Restart the computer.

  17. Double-click the My Computer icon to see if the Iomega Hard Drive is detected.

    If the Iomega Hard Drive letter appears, you can now use the drive.

    If the Iomega Hard Drive is still not detected, continue with the next step.


STEP FOUR - Disconnect the Iomega Hard Drive from the USB hub

    Note: If you are not using a USB hub, proceed to STEP FIVE

  1. Disconnect the Iomega Hard Drive from the USB hub.

  2. Try connecting the Iomega Hard Drive directly to one of the USB connectors on the computer.

  3. Restart the computer.

  4. Double-click the My Computer icon to see if the Iomega Hard Drive is detected.

    If the Iomega Hard Drive is detected, you can now use the drive.

    If the Iomega Hard Drive is still not detected, continue with the next step.


STEP FIVE - Check the USB controller

Please use the following steps to see if the USB controller is enabled and working properly.

  1. Right-click the My Computer icon and select Properties.

  2. Click the Device Manager tab.

  3. Click the plus (+) sign next to Universal Serial Bus Controllers.

    Note: If Universal Serial Bus Controllers is not listed, there is a problem with the USB controller or the USB controller is not enabled in the computer's BIOS. Please contact the computer or card manufacturer for updated drivers and/or for information on how to fix or enable the USB controller.

  4. Under Universal Serial Bus Controllers, a Universal Host Controller and a USB Root Hub should be listed.

    If the Universal Host Controller or USB Root Hub has an exclamation mark next to it or a red X on the icon , there is a problem with the USB Controller. Contact the computer or card manufacturer for updated drivers and/or for information on how to fix the USB controller.

    If the Universal Host Controller or USB Root Hub does not have an exclamation mark next to it or a red X on the icon , please continue.

  5. Now scroll through the list of USB controllers and look for for the name of the Universal Host Controller (i.e. Intel, Via, etc.). Please contact the manufacturer of the Universal Host Controller via the Web and download the latest driver available.

  6. Once you have downloaded the latest drivers, double-click the downloaded file to begin installation.

  7. Follow the on-screen prompts to complete the installation.

  8. Double-click the My Computer icon to see if the Iomega Hard Drive is detected.

    If the Iomega Hard Drive is detected, you can now use the drive.

    If the Iomega Hard Drive is still not detected, continue with the next step.


STEP SIX - Check for IRQ conflicts and create a separate boot file if necessary

An IRQ is an Interrupt Request. There are 16 of these hardware lines over which devices can send interrupt signals to the microprocessor. Please use the following steps to check for IRQ conflicts.

  1. Right-click the My Computer icon and select Properties.

  2. Click the Device Manager tab.

  3. Double-click the computer icon at the top of the Device Manager window.

  4. Click the View Resources tab.

  5. Select the Interrupt Request (IRQ) option.

  6. Ensure that the following list of Reserved and Default IRQ settings are present:

    Note: Reserved assignments are Universal and cannot be changed. Default settings are assigned by the hardware and can be shared or reassigned. The Reserved and Default settings should look something like the ones listed below. Systems may vary.

      00: (Reserved) System Timer

      01: (Reserved) Keyboard

      02: (Reserved) Programmable interrupt controller

      03: (Default) Communications Port (COM 2)

      04: (Default) Communications Port (Com 1)

      05: (Default) Sound Card or LPT 2

      06: (Reserved) Standard Floppy Disk Controller

      07: (Default) Printer Port LPT 1

      08: (Reserved) System CMOS/real time clock

      09: (Default) System device connected in a PCI slot

      10: (Default) System device connected in a PCI slot

      11: (Default) System device connected in a PCI slot

      12: (Default) PS/2 Compatible Mouse Slot

      13: (Reserved) Numeric data processor

      14: (Default) Primary IDE Controller

      15: (Default) Secondary IDE Controller

  7. Scroll through the list of IRQs and locate the IRQ for the USB controller. It is usually located between IRQ 09 and 11.

  8. For the USB controller, there should be two items listed:

    1. PCI to USB Universal Host Controller or Adapter

    2. IRQ Holder for PCI Steering

  9. If there are additional devices on the same IRQ as the USB controller (such as Modems, Network Cards, Audio devices, Video devices, PCMCIA controllers, etc.) an IRQ conflict is possible. Many times two or more devices can share an IRQ without conflicting. Other times IRQ sharing is not possible, which will result in computer lockups and device malfunctions.

  10. You may contact the computer manufacturer for more information about conflicting IRQs or you can physically remove any conflicting card or device from the computer. If your do not want to remove the conflicting card or device from your computer, please use the following steps to resolve IRQ conflicts by creating a separate boot profile.

    1. From the open System Properties window, select the Hardware Profiles tab. Original Configuration should be highlighted.

    2. Click the Copy button.

    3. In the text box, type a new Profile name such as Iomega Hard Drive.

    4. Turn off the computer.

    5. Turn the computer back on.

    6. Windows will now give you the option to select the Boot Profile you would like to use. Choose the profile that you just created above (Iomega Hard Drive).

    7. Right-click the My Computer icon and select Properties.

    8. Click the Device Manager tab.

    9. You will now need to disable the devices that are sharing the same IRQ by using the following steps.

      1. From the Device Manager, select one of the devices that are sharing the same IRQ as the USB Controller.

      2. Double-click the icon for that device.

      3. At the bottom of the Properties screen, click Disable this hardware profile to place a check mark in the box.

      4. Continue using the steps above to disable all of the devices that are on the same IRQ as the USB controller.

      5. Once you are finished disabling devices, restart the computer.

    10. Restart the computer and boot into the Iomega Hard Drive profile again.

      Note: When you want to use the Iomega Hard Drive, you will need to choose the profile that was created above (Iomega Hard Drive). For all other times, you will need to choose the Original Configuration boot.

    11. Double-click the My Computer icon to see if the Iomega Hard Drive is detected.

      If the Iomega Hard Drive is detected, you can now use the drive.

      If you are using a 40GB or 80GB Desktop (External) USB drive, the USB interface cable connection may be loose or there may be a problem with the interface cable. Please recheck the connection and if the drive is still not detected, please contact Iomega Technical support at http://www.iomega.com/support/contact/index.html

      If you are using any other Desktop (External) or Portable USB drive, please go to New Web Page Iconhttp://www.iomega.com/support/askiomega_options.html for additional troubleshooting options.

10 November 2003