Question about meaning of "POF"s


I am just curious: I have some media that scan really bad in my BenQ 1640 drive, which even produces POF errors in DVD-Speed.

However, when I do a TRT with the same drive, i.e. I simply try to read the whole DVD, the reading graph looks smoothly, and all the data can be read successfully.

So, what I am wondering is: I always thought that POF means errors that cannot be corrected anymore by the drive. On the other hand, the disc is perfectly readable in the same drive.

What am I missing now?



BenQ DW1655/1650 drives can report lots of POF on perfectly readable discs, and from what you say so can the DW1640.

BenQ DW1655/1650 drives can also show scans with no POF and no alarming PIE/PIF spikes and yet be unable to read some sectors. I don’t know if the same is true for the DW1640 but it wouldn’t surprise me.

This means that the POF and to some degree the PIE/PIF reporting of those BenQ drives are not trustworthy.

As for the reason why, nobody has posted a good explanation AFAIK.