detail information
| Posted by | Jan S. |
| Posted on | 21/05/05 21:49 |
Test Disc #2:
The second test disc is a Verbatim DVD-R 4x media from Taiyo Yuden:
--------------------------------------------------------------------------
Unique
Disc Identifier :
[DVD-R:TYG01]
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Disc
& Book Type : [DVD-R] -
[DVD-R]
Manufacturer Name : [Taiyo Yuden Co.
Ltd.]
Manufacturer ID :
[TYG01]
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 86 0d 13 66 78 80 00 .@....R.....fx..
0010 : 03 54 59 47 30 31
00 00 04 00 00 00 00 00 00 00 .TYG01..........
0020 : 05 88
80 00 00 00 01 00 06 08 0f 11 87 78 80 00
.............x..
0030 : 07 88 80 00 00 00 00
00 08 05 16 0d 0f 0b 0b 00 ................
0040 : 09 97 08
0f 0b 00 00 00 0a 00 00 00 00 00 10 00
................
0050 : 0b 05 1b 13 a8 89 65 00 0c b6 89 88 80 00 00
00 ......e.........
0060 : 0d 00 00 d0 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 VERBATIM
Disc Manufacturer ID: TYG01
Analysis of CATS results:
The only parameters outside of the limits are related to recording: the Aperture Ratio (AR) is too low and the LPP Bloc Error Rate (BLERa) is too high, which means that the pre-pits have been damaged when the disc has been recorded. Likewise, the Wobble Carrier to Noise Ratio (WOCNRa) is slightly too low, meaning that wobble detection is more difficult now that the recorded HF signal is interfering. All in all, these problems are just related to recording and would only matter if for instance we would like to add more data in a second session after this one: for playback, all parameters of the disc match the requirements.
We notice that the PI errors are increasing towards the outside of the disc with one inflection point in the middle of the disc. The shape of this PI errors plot is similar to the one displayed by the DC jitter and the Asymmetry (ASYM), which is the difference of DC offset voltage between the largest and the smallest pits. When the asymmetry increases (in this case towards negative values), it means small and large run lengths are not at the same level, which makes their recognition more difficult. Luckily the asymmetry stays above the low limit (-5%), so the disc should still play ok.
Our home-made test results:
Scanned with KProbe and Lite-On SHOW-1633S
Scanned with CD-speed and Philips DVDR1640P
|
Drive Info |
ID:1 PLEXTOR DVDR PX-712A V1.05 (#101824) | ||||||||||||||||||||||
|
Test Settings |
Read Speed: |
2X CLV | |||||||||||||||||||||
|
Test Interval Length: |
High Accuracy | ||||||||||||||||||||||
|
Test Result |
Disc Info: |
CD_SPEED_DATA_TEST_B DVD-R, 4489 MB (CD_SPEED_DATA_TEST_B) TYG01 | |||||||||||||||||||||
| |||||||||||||||||||||||
|
Test Duration |
0:28:21 |
||||||||||||||||||||||
|
Drive Info |
ID:1 PLEXTOR DVDR PX-712A V1.05 (#101824) | ||
|
Test Settings |
Read Speed: |
2X CLV | |
|
Test Result |
Disc Info: |
CD_SPEED_DATA_TEST_B DVD-R, 4489 MB (CD_SPEED_DATA_TEST_B) | |
|
Test Duration |
0:28:23 |
||
Summary:
|
Comparison |
Average |
Max |
Average |
Max |
POF |
|
AudioDev |
21.3 |
124 |
0 |
5 |
0 |
|
Lite-On |
0.51 |
7 |
0.02 |
2 |
- |
|
Philips |
1.12 |
7 |
0 |
- |
0 |
|
Plextor |
0.09 |
8 |
- |
- |
0 |
CATS vs. drives results:
All tools seem to agree that this is a good disc. However, the CATS reports a increasing PI error rate with one inflexion point at mid-playback, while all drives show a quite constant PI error rate. Once again the PX-712 shows a similar jitter plot to the one from the CATS, but the PI rate stayed flat, while the Philips drive saw a constant (but pretty high) jitter value over the complete disc. As seen in the table, the CATS had overall more problems than the drives to read this disc.
Head over to the next page where we will have a look at test disc #3…
Test Disc #1
There´s a reason for standards and specifications. It doesn´t matter, that there are many drives which outperforme a 1996 standard DVD ROM drive, if the one you have to use somewhere else doesn´t.
It´s great, if my new burner handles even discs, which reflecting to the standard, are completly f* ->aehm<- messed up, but if my lame notebook drive or the SA DVD Player or the 5 year old installation DVD ROM in my server can´t, it doesn´t really help me.
The specifications and standards are well known and I´m pretty upset, that the manufacturers don´t give a sh*t. If future players can´t play today´s discs, the customer has to worry.
Feel that manufacturers are not doing the R&D, but rather foisting incompetent and unreliable technology onto the buying public - I have decided against going hard drive or Disc for my camcorder. Can only afford one in my lifetime, so am going backwards to DV tape.
I also know many people who are so confused and have heard negative things about new technology such as unrelaibility, incompatability, and lack of longevity- no to mention that with so many avenues to go down, sales people do not know a lot anymore and conflicting sales views confuse the public even more.
It is time that the retailers told the manufacturers - NO - give me products to sell that will please my constomers and I know of at least one major large shop that specialises in Entertainment systems that refuse to sell anybodies DVD recorders due to the problems aforementioned.
This technology has been released too early and the manufacturers do not even know enough so their help lines are often of little help or incorrect advice.
Furthermore to have your pics put onto disc at great cost (commerciallly) and then find that a few years after, some of those pics are lost with more degrading quickly over time- I htink that perhaps the old ghastly VHS tape may be better for longetivity especially with consumer copied material.
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