CATS vs. Home-made scans

Test Disc #6:

The sixth test disc is a That’s Write! DVD-R media:

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Unique Disc Identifier : [DVD-R:VANGUARD]
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Disc & Book Type :       [DVD-R] – [DVD-R]
Manufacturer Name :      [Vanguard Disc Inc.]
Manufacturer ID :        [VANGUARD]
Disc Application Code :  [Unrestricted Use : Consumer Purpose]
Recording Speeds :       [1x , 2x , 4x]
                         [6x And Higher Might Not Always Be Detectable]
Blank Disc Capacity :    [2,298,496 Sectors = 4,489.3MB = 4.38GB (4.71GB)]
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** INFO : Hex Dump Of ‘Media Code’-Block Listed Below
** INFO : 4-Byte Header Preceding ‘Media Code’-Block Discarded
** INFO : Format 0Eh – Pre-Recorded Information In Lead-In
0000 : 01 40 c1 fd 9e d8 52 00  02 f7 0e 0b 77 88 70 00   .@….R…..w.p.
0010 : 03 56 41 4e 47 55 41 00  04 52 44 00 00 00 00 00   .VANGUA..RD…..
0020 : 05 aa a2 22 22 20 01 00  06 0b 0f 12 66 66 80 00   …”" ……ff..
0030 : 07 88 80 00 00 00 00 00  08 01 1b 0b 0f 08 08 00   …………….
0040 : 09 55 09 10 0b 90 88 00  0a 80 88 80 88 80 10 00   .U…………..
0050 : 0b 00 00 00 00 00 00 00  0c 00 00 00 00 00 00 00   …………….
0060 : 0d 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   …………….
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[ DVD Identifier - http://DVD.Identifier.CDfreaks.com ]
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AudioDev CATS test results:

Disc id: DVD-R THAT´S WRITE

Disc Manufacturer ID: VANGUARD

Analysis of CATS results:

This disc has several critical parameters out of the specification limits. At the end of the disc the Bottom Jitter exceeds 19%, which is more than twice the maximum allowed value. The Reflectivity (R14H) is quite low and sometimes just below the minimum value, but this is not much of a problem. On the other hand, the Asymmetry ratio reaches ‘“20, which means that the HF signal is extremely deteriorated. Not only the data are damaged but we see that the Radial Error (Radial2) is increasing a lot at the end of the disc, which means that the drive also has more and more difficulties following the track near the end of the disc. As a result, the PI errors are very high and some POF occur in this region.

Our home-made test results:

Scanned with KProbe and Lite-On SHOW-1633S

Scanned with CD-speed and Philips DVDR1640P

CATS vs. drives results:

From all our drives only the Lite-ON was able to successfully complete the scan of this disc. The worse result was obtained by the Philips drive, which gave up after only 2.8 GB. Note that in this case the CATS has been able to keep reading the disc at very high bottom jitter values, which means that the Pulstec drive also has a very good PLL and that the failure of disc #4 was due to another problem. This is another example of disc which can be read by the CATS and not by some drives.

Note on the CATS results that PIE SUM8 reaches 1664 and PIF SUM1 reaches 208, which are the theoretical maximum values : at the same time, we see on the graph that POF goes to 1 and stays there, which means that all ECC blocks are bad, which is perfectly consistent. The ‘209′ reported by KProbe also corresponds to a completely bad ECC block and should be a ‘208′, but was probably caused by a sampling problem. This is a good example of the better measuring accuracy of CATS systems.

Head over to the next page for the conclusion…