Pi/Po Scanning with CD Speed v4.10 using NEC-3550a

Hello everyone,

I just purchased a NEC-3550a.

I also have some Taiyo Yuden DVD-R 16x (TYG03).


I burned one TYG03 at 4x, and ran a Pi/Po Scanning using DvdInfoPro.

Results:

PI Peak: 340 PIF Peak: 112
PI Avr : 223 PIF Avr : 8

Quality: 16.39%


Then decided to run a Pi/Po Scanning using Nero CD Speed v4.10

Results:

PI Errors PI Failures
Average: 437.82 Average: 4.68
Maximum: 1595 Maximum: 98

Quality Score: 0


I was really discurage, and really hated my NEC-3550a

Then I came across this message on this forums:

Below is some additional info from the author of CD-Speed.

Quote:

Originally Posted by ErikDeppe

I haven’t been able to test this myself but it seems that NEC fixed a bug with the scanning interval.

To change the scanning interval with Nero CD-DVD Speed the following registry value can be added:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\ahead\Nero Toolkit\CD Speed\CD Quality]

“Scanning Interval”=dword:0000008 for 8ECC or =dword:0000001 for 1ECC

To compare with other drives following intervals can be used:

8 ECC (to compare with BenQ/Philips/QSI/Pioneer)

1 ECC (to compare with LiteOn/BTC/Plextor)

32 ECC (to compare with AOpen)

The colored backgrounds and quality score are changed accordingly.

So I decided to add this Registry value and selected 1 ECC (to compare with LiteOn/BTC/Plextor)

“Scanning Interval”=dword:0000001

Then decided to run an other scan on the same media !

Results:

PI Errors PI Failures
Average: 115.54 Average: 0.08
Maximum: 188 Maximum: 3

Quality Score: 93


DAMN !!!

All this change from this little registry change ?

NOW, can I trust those CD Speed Scans ?

I can’t trust DvdInfoPro I guess ??

Comments anyone ?

Hello again,

Here’s a scan of a RITEKG04


General Information
Drive: _NEC DVD_RW ND-3550A
Firmware: 1.05
Disc: DVD-R (RITEKG04)
Selected speed: 5 X
PI errors
Maximum: 174
Average: 49.60
Total: 702960
PI failures
Maximum: 10
Average: 0.31
Total: 5600
PO failures: n/a
Jitter: n/a
Scanning Statistics
Elapsed time: 15:44
Number of samples: 139265
Average scanning interval: 1.00 ECC
Glitches removed: 0

Quality Score: 50

Now since that reg value added, those scans are starting to make sense :slight_smile:

Scanning @8ECC => the max accepted PIF level is 16.
Scanning @1ECC => the max accepted PIF level is 4.

The difference in scans performed @8ECC and 4ECC is misleading as you can’t interpret the results in the same way.

A scan @4ECC will show lower PIF errors but the max acceptable is also lower. :wink:

If you want more useful comments, please post the actual scans/graphs, raw numbers are difficult to read and sort out. :slight_smile:

BTW the 3550/4550/4551 family of drives has been showed to be pretty unreliable for scanning. http://club.cdfreaks.com/showpost.php?p=1245318&postcount=6 - you may find more comments about this by searching this subforum.

CDSpeed and DVDInfopro (assuming you have the most recent version of the latter) report exactly the same thing. They only report what the drive reports. Any discrepancy between a scan performed with CDSpeed and another performed with DVDInfopro (both with the same disc of course) is to blame on the drive/disc combination, not on the software.

Hope this helps :slight_smile:

Cheers :slight_smile: