Hello. My name is Michael. I will be helping you with your question today.
Check to see if you are recording in VR mode. There are some restrictions depending on the mode of recording - VR or Video.
Once a DVD-R/-RW is recorded in VR or Video mode and finalized, you cannot perform additional recordings. Once a DVD-R/-RW is recorded in Video Mode and fi nalized, it becomes a DVD-Video. In both modes, playback can be performed before and after fi nalization, but additional recording, deleting and editing can not be performed after fi nalization. If you want to record the disc in VR Mode and then record in V Mode, be sure to execute format. Be careful when executing Format because all the recorded data may be lost. You can change the disc mode only one times when the unused DVD-R disc is inserted.
Video mode is most likely what you want to be recording in, since this is the mode that records a disc that can be played back in normal devices. In fact, for this, you should use DVD+R. It is the most reliable format.
More details on formats and discs can be found on page 7 of the manual here:
It is also possible that the tape has Macrovision protection on it which will not allow it to be copied. Many people are under the impression that only commercial recordings are encoded like this, but there are actually many recorders and cameras that add this encoding as well.
That should not cause this because the speeds of the two are independent. Do you happen to have a VHS recorded at SP? I'm not saying it's impossible - but it's not something I've ever seen affect the process.