by minchin on Wed Dec 04, 2002 12:32 pm
Ian,
If this drive is anything like the Optorite....
You are probably tired of hearing me about this drive on VCDs, but I just found something that might be of interest. You remember me saying that a lot of drive slows down a lot when reading VCDs. Optorite seem to be the exception (probably because it doesn't care about errors very much like you said in doing scratch disc test). I was curious so I rip a pressed VCD twice and compare their MD5 checksum.... yes, they are different each time. Tried it with CDR VCD, same thing. The VCD burnt from the image looks just fine, but I wonder if you have a Mode 2 disc with data, would there be a problem (don't have some around to test).
Also noticed that TDK 4800B is so far the best VCD ripper. It is quite speedy (not as fast as Optorite) and accurate.
However, LiteOn 52x24x52 and Asus 48x16x48 all seem to have problems reading VCD properly. It will read fine and at some %, it will slow down.... then picks up again, and for some reason, at 80% or so, it will slow to almost a stop..... no LED activity.... CloneCD shows read speed 0.0.
I don't know if it has to do with CloneCD (multimedia profile) or not. I have not yet fully tested cloning VCD with the Data disc profile to see if it is just with MM profile. Maybe it has to do with the extract subchannel data function when reading a mode 2 disc.... (probably not necessary with VCD, but a default for the MM profile)
If you have any suggestions as to what tests I should do to investigate this further, let me know.
Min