QB Issue Resolution:

You don’t want to work from a USB or external device.

The USB is great for moving a Backup (.qbb) file from one computer to another. You Copy that onto the computer so that it is Local = on the harddrive.

You use the Restore function in QB, not the Open button. Now the QB program makes an uncompressed data file (.qbw) from that .qbb file.

External devices are not really fast enough for this relational database and/or pause (sleep) during updates, which results in the error “Connection to the data file has been lost” which leads to data file corruption.

Resolution for Issue 'company files on thumb will not open, error codes -6000 & -304?' available: Yes (Solved).
Source: Intuit Community forum.

company files on thumb will not open, error codes -6000 & -304?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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