Issues booting while a USB drive is connected is usually the result of a USB Device option being enabled in the System BIOS' Boot Order or Boot Sequence.
Some of these steps require accessing the system’s BIOS. Please refer to the system or motherboard manufacturer’s documentation for access and configuring options.
Here are some steps to try and resolve the issue:
- Check to see if the active flag is set to active on the partition. If it is then remove the active flag using these instructions.
- Check the format of the drive. Some Seagate drives ship as exFAT for Window and Mac compatibility. For some systems this may present issues. If using on Windows only, then format the drive to NTFS. See how to format your drive here. If using exFAT is required, try one of the other options listed.
- Disable Boot from USB devices in the BIOS
Note: Verbiage will vary from system to system - Disable USB Legacy Support in the BIOS
Note: If you are using a USB mouse or Keyboard disabling legacy support may result in those devices not functioning in Real mode (MS-DOS) or Safe Mode. - Here are two Microsoft links that cover Disabling USB Legacy support
Some System BIOS' may not include the ability to disable USB devices from the Boot Order/Boot Sequence. If this is the case, it is recommended that you disconnect the USB External Drive from your system until the system’s operating system has fully booted; at which time you can connect the USB Drive to your system.
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