Consider the following scenario:

• You attach an external “Institute of Electrical and Electronics Engineers” (IEEE) 1394 Serial Bus Protocol 2 (SBP2) hard disk and an external IEEE 1394 SBP2 optical drive to a Windows Vista-based computer.
• You copy files from the attached optical drive to the system internal hard disk.
• At the same time, you copy files from the attached hard disk to the system internal hard disk.

In this scenario, the file transfer from the attached devices to the system internal hard disk cannot be completed. The file transfer dialog box does not disappear until the system restarts. Additionally, the attached hard disk cannot be accessed, and the attached optical device loses its drive letter.