CloneCD FES Software EC is unreliable - Club CDFreaks

drezon · 25-05-2002

Today I noticed that software EC with the Ultraplex32 (and other drives) is absolutely unreliable.
For example I read out a SD2 CD, which was written with AWS, using FES(Software) and the Ultraplex. CloneCD gave me hundreds of errors in the area of the weak sectors.
It seems as if the software EC is not working at all.
Reading the same CD out using the FES Hardware setting, while being *extremely* slow (due to the Plex spinning down and never spinning up again), only produced the usual errors at sectors >800.
Other drives I have tested this with (those that support software EC) did also exhibit this problem.
I have tested this with CloneCD 3.3.4.1 and 4.0.0.1
Is software EC working at all?

*alexnoe* · 25-05-2002

Did you use a toshiba dvd-rom as reader? The 1502 refuses reading amplified week sectors without hardware EC.

drezon · 25-05-2002

As I posted I used an UltraPlex32. I also tested this on a very old TEAC-524E, with the same results.
I'm begining to think that software EC is not working at all.
The weak sector thing is only one example of CloneCD behaving strangely in this respect.
Basically, if any sector is damaged / doesn't match EDC/ECC, but still would be correctable easily, CloneCD simply doesn't do so.
Instead it reports an error and fills the sector with 0x55.

little-endian · 25-05-2002

Yes, a can confirm this.
I've tested to read an amplified CD with my UltraPlex 40max.
You'll only get reliable results, if you turn off the FES.
The same goes to the PlexWriter PX-W1210S.
With this drive, you won't get bad sectors in the weak sector area, but the read sectors differ from the originals.
With a Toshiba SD-M1402, you can leave FES enabled on reading.

drezon · 26-05-2002

If I understand you correctly, the SD-M1402 does support Software EC, and even if done so, CloneCd reads out reliable. If this is true, it's not a Software EC implementaion problem, as I suspected first, but rather an odd hardware problem.
As spath pointed out in another thread for FES set to software on a Plex, DRC is set to 1 (requesting the drive to not perform EC, and transmit the sector nonetheless). Perhaps the Plex (and some other drives) transmiting trashed data in such a case, for some odd reason (Audio mode? interpolation?).

**FutureProof** · 28-05-2002

Quote:

Originally posted by drezon
Perhaps the Plex (and some other drives) transmiting trashed data in such a case, for some odd reason (Audio mode? interpolation?).

perhaps because the Plexies are not fully MMC compliant? Olli has stated this before, I don't know what he refers to, but isn't this what makes them such great devices? 2c

25-05-2002	#1 (permalink)
drezon CD Freaks Junior Member Join Date: Mar 2002 Location: Germany Posts: 60	CloneCD FES Software EC is unreliable <a href='http://adstats.cdfreaks.com/www/delivery/ck.php?n=a13febf7&cb=INSERT_RANDOM_NUMBER_HERE' target='_blank'><img src='http://adstats.cdfreaks.com/www/delivery/avw.php?zoneid=30&cb=INSERT_RANDOM_NUMBER_HERE&n=a13febf7' border='0' alt='' /></a> Today I noticed that software EC with the Ultraplex32 (and other drives) is absolutely unreliable. For example I read out a SD2 CD, which was written with AWS, using FES(Software) and the Ultraplex. CloneCD gave me hundreds of errors in the area of the weak sectors. It seems as if the software EC is not working at all. Reading the same CD out using the FES Hardware setting, while being extremely slow (due to the Plex spinning down and never spinning up again), only produced the usual errors at sectors >800. Other drives I have tested this with (those that support software EC) did also exhibit this problem. I have tested this with CloneCD 3.3.4.1 and 4.0.0.1 Is software EC working at all? __________________ DON'T PANIC

25-05-2002	#3 (permalink)
drezon CD Freaks Junior Member Join Date: Mar 2002 Location: Germany Posts: 60	As I posted I used an UltraPlex32. I also tested this on a very old TEAC-524E, with the same results. I'm begining to think that software EC is not working at all. The weak sector thing is only one example of CloneCD behaving strangely in this respect. Basically, if any sector is damaged / doesn't match EDC/ECC, but still would be correctable easily, CloneCD simply doesn't do so. Instead it reports an error and fills the sector with 0x55. __________________ DON'T PANIC

26-05-2002	#5 (permalink)
drezon CD Freaks Junior Member Join Date: Mar 2002 Location: Germany Posts: 60	If I understand you correctly, the SD-M1402 does support Software EC, and even if done so, CloneCd reads out reliable. If this is true, it's not a Software EC implementaion problem, as I suspected first, but rather an odd hardware problem. As spath pointed out in another thread for FES set to software on a Plex, DRC is set to 1 (requesting the drive to not perform EC, and transmit the sector nonetheless). Perhaps the Plex (and some other drives) transmiting trashed data in such a case, for some odd reason (Audio mode? interpolation?). __________________ DON'T PANIC

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25-05-2002	#2 (permalink)
alexnoe CDFreaks Resident Join Date: May 2002 Location: Germany Posts: 4,613	Did you use a toshiba dvd-rom as reader? The 1502 refuses reading amplified week sectors without hardware EC.

25-05-2002	#4 (permalink)
little-endian CD Freaks Senior Member Join Date: Apr 2002 Location: Germany Posts: 280	Yes, a can confirm this. I've tested to read an amplified CD with my UltraPlex 40max. You'll only get reliable results, if you turn off the FES. The same goes to the PlexWriter PX-W1210S. With this drive, you won't get bad sectors in the weak sector area, but the read sectors differ from the originals. With a Toshiba SD-M1402, you can leave FES enabled on reading.