Turn off the Ad Banner  

To print: Select File and then Print from your browser's menu.

    -----------------------------------------------
This story was printed from CdrInfo.com,
located at http://www.cdrinfo.com.
-----------------------------------------------


Appeared on: Friday, December 20, 2002
Test Media


1. Introduction

Test Media - Page 1

- Introduction

Recently we have upgraded our test methodology with the adoption of industry standard test discs. The importance of standardized test discs is high since it enables manufacturers to isolate and improve possible problems/bugs that may arise during our tests. In the following pages we describe the physical characteristics of the discs.

- What is test media?

Various kinds of Test media are used in developing audiovisual goods, car audio goods, and computers you often see in your daily life. They play a very important role in securing playback compatibility between those products. For instance, you don't worry whether music CDs sold in the ships will play on your CD player. You know it will. That's because hardware manufacturers of CD player have maintained the compatibility for various conditions of discs. Test media is always necessary to achieve that. Without test media, you perhaps, might have to worry about the playability of music CD you want to buy at shops.

"Test media" might be described, in other words, like a "measuring rod of playability". In reading a CD, for instance, there is provision in the reader for disc damage. Even if there are small scratches on your CD, the CD player can often play the CD without any noise or interruption since it has some error correction circuitry. Using standard Test CD with various sized scratches, hardware manufacturers can know the capability margin of their CD player and its ability to correct for scratches and defects in the media.

"Test media" is the generic name for discs and tapes user as standards for strict quality specifications, which are required in the processes of designing, manufacturing, and quality control of DVD (CD)-ROM drives, DVD (CD) players, MD players, and Cassette tape recorders.

- Where "Test Media" products are used?

They are used in diversified places and purposes not only in designing, but also in the production process such as the process of manufacturing, assembling, and inspection. All products pass through tests before shipment will be shipped to the marketplace. Every DVD player you used and every CD-ROM drive you have used to play movies or games was tested to standard using Test Media products.

Test media products are used in the development and manufacturing of:

- Are there various kinds of "Test Media"?

Besides standard times are mainly used for reference purposes, various Test Media have been developed on which defects are intentionally created in order to simulate flaws and damage. Testing of CD, DVD and other involves this type of media. As Almedio says "...we have developed more than 3000 kinds of test tapes and more than 1500 kinds of custom test discs..."

- Which manufacturers sell "Test Media"?

was established in 1981. The company is engaged in 1) the planning, development, manufacture and sale of commercial-use test media such as test discs, test tapes and test CD-ROMs used to measure and adjust the performances of electrical, mechanical characteristics of cassette players, video players, CD players and CD-ROM drives; 2) manufacture of music CDs consigned by music software production companies and CD-ROMs and 3) consigned systems development and development and sale of CAD (computer-aided drafting) systems.

Almedio is probably the biggest manufacturer that offers Test Media. They offer CD, CD-R, DVD, MD and casette test media for various uses. For more information check www.almedio.co.jp

Contact
Sales Division Test Media Dep.
Phone: 042-397-1331Fax: 042-397-1919
E-MAIL: tm-sales@almedio.co.jp

- Pioneer: Pioneer DVD Verification Laboratory offers DVD-R/RW verification Tests discs for DVD-R/RW enabled drives. Fore more information check their website or contact them directly...

DVD Verification Laboratory
4-2610 Hanazono,
Tokorozawa-shi,
Saitama 359-8522,
Japan
Fax: +81-42-990-2831
E-Mail: minemasa_ohta@post.pioneer.co.jp

- TEAC Japan offers also a series of test media for CD, DVD, MD, casette formats.

For more information:
Calibration Media Group
Phone: (81) 0422 52 5074
Fax: (81) 0422 55 2582
E-Mail: media@ho.teac.co.jp

- JVC Japan offers a series of test media for CD, DVD, MD, casette formats

For more information:
VICTOR COMPANY OF JAPAN, LIMITED
MITO BUSINESS CENTER
TEST MEDIA GROUP
1030 Motoyoshida-cho, Mito-city, Ibaraki, 310-8528 JAPAN
Telephone: +81-(0)29-247-3111
Fax: +81-(0)29-247-1570
E-mail: t-media@md.jvc-victor.co.jp

- Panasonic Japan offers test media for DVD formats

- Philips offers a variety of test media for CD format.


2. ABEX TCD Series

Test Media - Page 2

ABEX TCD Series

ABEX TCD series discs are designed for measurement and adjustment of the focusing/tracking servo characteristics and error correction performance of compact disc players when playing a test CD with various kinds of defects. The signals recorded on the TCD disc series are shown in the following table:

Table-1
TNO
Contents
Time
1
Menuetto
3'15"
2
2eme Gymnopedie
2'32"
3
Overtunre Miniature (Casse-noisetter, Op. 71a)
3'02"
4
Marche (Casse-noisette, Op. 71a)
2'36"
5
Claire de Lune
3'09"
6
Nocturne (Op.9-2)
3'12"
7
Danse de la Fee Dragee (Casse-noisetter, Op. 71a)
2'26"
8
Danse Arabe (Casse-noisette, Op. 71a)
2'29"
9
Fantaisie-Improptu (Op. 66)
2'51"
10
Hungarian Dance No. 5
2'02"
11
Prelude <Raindrop>
3'38"
12
Maiden's Prayer
3'15"
13
Valse des Fleurs (Casse-noisette, Op. 71a)
3'08"
14
1ere Gymnopedie
2'54"
15
Danse des Mirlitons (Casse-noisette, Op. 71a)
2'06"
Total time (including pause time)
43'05"

- Eccentric Test CD

1. Purpose: These discs are designed for measurement and adjustment of the tracking servo characteristics of a CD player when it is used to play an eccentric compact disc.

2. Disc specifications

2.1. Eccentricity of TCD-714 (280±15micrometers)

2.2. Recorded: The signals recorded on the disc are shown in Table-1

2.3. Center hole diameter: 15+0.04mm

2.4. Scanning velocity: 1.25m/s

- Scratch Test CD

1. Purpose: These discs are designed for measurement and adjument of the tracking servo characteristics and error correction performance of CD players when playing a scratched compact disc.

2. Disc specifications of TCD-721R

2.1. Recorded: The signals recorded on the disc are shown in Table-1.

2.2. Scratch Specifications

TNO
Width of scratch
1
0.0mm
2
0.4mm
3
0.6mm
4
0.8mm
5
1.0mm
6
1.2mm
7
1.4mm
8
1.6mm
9
1.8mm
10
2.0mm
11
2.2mm
12
2.4mm
13
2.6mm
14
2.8mm
15
3.0mm

2.3. Center hole diameter: 15+0.04mm

2.4. Eccentricity of track radious: 0+20micrometer

2.5. Scanning velocity: 1.25m/sec

- Defects Test CD

1. Purpose: This discs is designed for measurement and adjustment of the error correction performance of a CD player when it is used to play a defective compact disc. This disc contains three types of defects: interruption, black dots, and fingerprints.

2. Disc specifications of TCD-726

2.1. Recorded: The signals recorded on the disc are shown in Table-1

2.2. (a) Interruption: Dropout of pits is simulated by varying the length of the pit (see Fig-1)

2.2 (b) Black dots: Stains and foreign materials on the disc surface are simulated in this section (see Fig-2)

2.2. (c) Fingerprints: Fingerprints are simulated in this section (see Fig-2)

TNO
Description
1
None
2
0.5mm interruption
3
0.7mm interruption
4
0.8mm interruption
5
0.9mm interruption
6
1.0mm interruption
7
ø 0.4mm black dot
8
ø 0.6mm black dot
9
ø 0.8mm black dot
10
ø 1.0mm black dot
11
ø 1.0mm black dot
12
None
13
ø 65micrometers fingerprints
14
ø 65 / ø 75micrometers fingerprints
15
ø 75micrometers fingerprints

2.3 Scanning velocity: 1.25m/sec

- Limits

The local defects and the various scratches that the TCD series test discs includes is not supposed to passed from all drives. For example, we can see at the following test report of the AOpen CRW4048 with firmware v1.07 that manufacturer is satisfied from the drive's ability only to pass up to 1.2mm scratch, and not the full 3.0mm.

We have to understand that the limits of the TCD series are sometimes over the limits that CD standards state. If a drive can work over its limits it is possible that will read the defect area of the disc without any problems...Making a drive working out of its limits however, indicates that a lot of work is done in the firmware that is time consuming. Not all companies can spend much time to improve a drive's ability to read damaged/defect media.


3. ABEX TDR Series

Test Media - Page 3

ABEX TDR Series

1. Purpose

ABEX TDR Series discs are designed for DVD-ROM drives. These discs can be used for evaluation of DVD-ROM performances such as data reading capability, access time, and so on. The construction and formula of data in this disc is clearly specified, so that you can confirm whether data has been read correctly. This is done by comparing the sector address and data on a specified sector with known data. No file structure (UDF file format) exists in this disc, so that we can use this disc for many different purposes.

2. Disc specifications

2.1. Disc Parameter

Disc Type
TDR-820A
TDR-840
Disc structure
Single Sided Single Layer
Single Sided Dual Layer Parallel track path
Capacity
4.7Gbyte
8.54Gbyte
Scanning velocity
3.49m/sec
3.84m/sec

2.2. Data format

ID
IED
CPR-MAI
User Data
EDC
4
2
6
2048
4Byte

3. The construction of user data

This data consists of the following six types:

  1. Sector number data (start sector address , from 03 00 00h)
  2. Sector number data (start sector address, from 00 00 00h)
  3. ECC block number data
  4. "ABEXDVD" character data
  5. M-Sequence data
  6. Check sum data

3.1. Contents of the data sector

ID
Sector information + sector number
4 Bytes
IED
ID error detection code
2 Bytes
CPR-MAI
Copyright management information
6 Bytes
User data
Test data
2.048 Byte
EDC
Error detection code
4 Bytes
TDR-820A: Sector address
03 00 00h through 25 FF FFh
TDR-840: Sector address
Layer 0: 03 00 00h through 22 D0 5Fh
Layer 1: 22 D0 60h through 42 A0 BFh

SINGLE LAYER DISCS (the TDR-820A is the base disc for all test discs in this series)

The TDR-821 contains scratches with the following characteristics

Width of Scratch
Address No. (hex)
0.4mm
05363A
0.6mm
06866C
0.8mm
07CEC0
1.0mm
0929A5
1.2mm
0A971B
1.4mm
0BF481
1.6mm
0D3166
1.8mm
0E6D9E
2.0mm
0F8E67
2.2mm
10D1F0
2.4mm
12636F
2.6mm
13E734
2.8mm
154C11
3.0mm
175F96

The TDR-825 contains defects with the following characteristics

Description
Address No. (hex)
0.5mm black band
07E0A6
0.7mm black band
097BD8
0.8mm black band
0B30BD
0.9mm black band
0CFF55
1.0mm black band
0EE7A1
1.1mm black band
10E99F
ø 65micro meter fingerprints
158330
ø 75micro meter fingerprints
186E16

DUAL LAYER DISCS (the TDR-840A is the base disc for all test discs in this series)

The TDR-841 contains scratches with the following characteristics:

Width of Scratch
Address No. (hex)
Layer 0
Layer 1
0.4mm
0503C8
24D428
0.6mm
063508
260568
0.8mm
075F23
272F83
1.0mm
089A1A
286A7A
1.2mm
09E5ED
29B64D
1.4mm
0B232A
2AF38A
1.6mm
0C42E3
2C1343
1.8mm
0D6200
2D3260
2.0mm
0E6834
2E3894
2.2mm
0F8DF5
2F5E55
2.4mm
10FA7F
30CADF
2.6mm
125A93
322AF3
2.8mm
139E97
336EF7
3.0mm
15812F

35518F

Below is a picture of the ABEX TDR-841 series:

After zooming over the scratch we can see the details:

The TDR-845 contains defects with the following characteristics:

Description
Address No. (hex)
Layer 0
Layer 1
0.5mm black band
076F64
273FC4
0.7mm black band
08E4BC
28B51C
0.8mm black band
0A716A
2A41CA
0.9mm black band
0C156E
2BE5CE
1.0mm black band
0DD0C7
2DA127
1.1mm black band
0FA376
2F73D6
ø 65micro meter fingerprints
13D0A3
33A103
ø 75micro meter fingerprints
1676C9
364729

A closer look over the black band and fingerprints:


4. ABEX TDV Series

Test Media - Page 4

ABEX TDV Series

- Purpose

The ABEX TDV Series discs are designed for measurement and adjustment of DVD video players. These single-sided dual layer (S-2 type) discs check layer switching operation from layer 0 to layer 1, and also include test pictures and test signals for Dolby Digital, linear PCM (48k/24bit, 96k/24 bit), and others which facilitate checking for high quality picture and sound.

1. Disc specifications

Disc Type
DVD-VIDEO MPEG-2 NTSC
Disc structure
Single Sided Dual Layer (S2)/ Opposite track path
Capacity
8.49Gbyte
Scanning velocity
3.84m/sec
Transfer rate (video)
2.6-8Mbps

- TDV-541

The TDV-541 contains scratch with the following characteristics:

Chapter No.
Width of scratch
1
0.0mm
2
0.4mm
3
0.6mm
4
0.8mm
5
1.0mm
6
1.2mm
7
1.4mm
8
1.6mm
9
1.8mm
10
2.0mm
11
2.2mm
12
2.4mm
13
2.6mm
14
2.8mm
15
3.0mm
16
None

- TDV-545

The TDV-545 contains defects with the following characteristics

Chapter No.
Description
1
None
2
None
3
None
4
None
5
None
6
None
7
ø 0.4mm black dot
8
ø 0.6mm black dot
9
ø 0.8mm black dot
10
ø 1.0mm black dot
11
ø 1.0mm black dot
12
None
13
ø 65micro meter fingerprints
14
ø 65 & 75micro meter fingerprints
15
ø 75micro meter fingerprints
16
None

5. Philips SBC-444A

Test Media - Page 5

Philips SBC-444A

- Purpose

This disc has built-in defects that can be used for checking error rates. In addition to providing known errors, it tests the player under maximum stress. The purpose of this disc is adjustment / checking of the CD player. Note that the disc is not within specification concerning local defects. The defects found on the disc are interruptions of the information layer, black dots at out-read area, and simulated fingerprint.

Disc SBC 444A provides two kinds of defects: Missing information, and black spots. The tracks with missing information should provide fairly repeatable results since these errors are encoded into the data. The sections with Black Spots have the information in tact, but obscured by the black spots. In this case, not only is there information lost, but the servomechanisms are stressed. For example, when the readout beam encounters the black spot, focus, track following, and clock recovery servo signals disappear. After the beam has passed the black spot and the signal is restored, the pickup is out of focus, off track, and the bit clock is at the wrong frequency. This causes many additional errors to be generated in an unpredictable way.

Nero CD Speed Graph


6. CD-Check Test Disc

Test Media - Page 5

CD-Check

- Purpose

Digital Recordings CD-CHECK is a compact disc which allows evaluation of the CD player's "error correction headroom" (i.e. player's ability to correct data errors) and "tracking" (i.e. player's ability to stay on track despite of disc surface or other errors). CD-CHECK uses special digital signals in combination with disc error patterns arranged over five tracks. The five tracks contain a sequence of progressively difficult tests referred to as Check Level-1 to Check Level-5. The higher the Check Level passed the more reliable the sound reproduction of the CD player. A smooth, continuous tone of 20-seconds indicates the player passes that Check Level. Any clicks, interruptions, skipping or looping indicates failure of a Check Level.

CD-CHECK error sizes
Check Level-1
standard manufacturing errors
Check Level-2
0.375 mm
Check Level-3
0.750 mm
Check Level-4
1.125 mm
Check Level-5
1.500 mm

We test each the drive with the following procedure: We used WinXP Windows Media Player to playback the disc, and using headphones we listened all tracks. A continuous tone of 20 seconds plays in each track. If the drive playbacks without an audible pop or click occurring during playback of the tone it passes the check level. The tests are repeated five times. A result of 5/5 indicates that no pops or clicks were heard in 5 out of 5 playbacks of a particular track. A result of 0/5 means pops or clicks occurred during all 5 playbacks of a particular track. Digital Recordings provides the following interpretation of results:

· Level-1 Pass: Player meets minimum requirements
· Level-2 Pass: Average error correction
· Level-3 Pass: Good error correction
· Level-4 Pass: Very good error correction
· Level-5 Pass: Excellent error correction



Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .