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Home > Hardware Reviews > Optical Storage > Media

Friday, April 28, 2006
DVD Media Quality Tests - DaTARIUS

2. Test Procedure - Definitions

Disc Burning:

In an effort to ensure the integrity of the results, the disc burning setup and configuration should be the same for all discs and drives. Our PC testbed consists of a Pentium-4 workstation with the following specifications:

Intel Pentium-4 Processor 3.6 GHz/ 800Mhz FSB,
1GB DDR2-533 MHz dual channel RAM,
Seagate 120 GB 7200 rpm SATA hard drive with 8 MB cache,
Microsoft Windows XP Pro
, SP2

The recording drives (burners) used in this test include:

  • BenQ DW-1640A vBSHB
  • Plextor PX-716A v1.08
  • Pioneer DVR-110 v1.22
  • LiteOn SHW-1635S vY.S0N
  • NEC ND-4551A v1-8T

The PC is equipped with Nero Burning Rom 6, version v6.6.0.16 . The same image was burned onto DVD media, at the maximum allowed speed. In most cases, the speed was 16x. In cases where the burning speed was lower, this is noted in the corresponding tables.

Discs:

MID
Brand Name
Infomer30
Philips 16x DVD+R
Prodisc S05
Prodisc unbranded 16x
Prodisc F02
Prodisc unbranded 16x
Prodisc R04
Prodisc unbranded 16x
Daxon 016s
BenQ DVD-R 16x
Daxon AZ3
BenQ DVD+R 16x
CMC MAG AM3
Philips DVD-R 16x
CMC MAG M01
Ridisc DVD+R 16x
Ritek R04
Traxdata DVD+R 16x
Ritek F1
Traxdata DVD-R 16x
Optodisc R016
Optodisc DVD-R 16x
Optodisc OR16
Optodisc DVD+R 16x
RICOH JP NR03
Ricoh DVD+R 16x
MCC 004
Verbatim DVD+R 16x
MCC 03RG20
Verbatim DVD-R 16x

Definitions:

PI and PO:
Stands for Parity Inner and Parity Outer. Reed-Solomon Product Code (RS-PC) is a method of error correction employing a number of groups of Reed-Solomon parity bytes computed from rows, columns, or diagonals of a rectangular data array. DVD uses two-group method of RS-PC for error correction. The redundant codes of rows and columns are called Parity of the Inner code (PI) and of the Outer code (PO) respectively. DVD discs correct small read errors using PI, that operates on rows, and corrects large read errors using PO, that operates on columns of the data array.

PIE:
Stands for Parity Inner Error. The number of error corrections made on incoming rows of data in the first pass of the decoder using the inner parity correction code. A row of an ECC Block that has at least 1 byte in error constitutes a PI error. PIE is measured over 8 ECC blocks. In any 8 consecutive ECC Blocks the total number of PI errors before correction shall not exceed 280, as defined by the DVD specification, or ISO/IEC
16448:2002 or ecma-267, third edition, April 2001. PIE are also called as PI Sum 8.

POE:
Stands for Parity Outer Errors. Parity outer fails. The decoder was unable to correct the data using the outer parity codes. It is measured over 1 ECC block.

This test uses the measured maximum inner parity (PI Sum8) errors for recordable DVD as a high-level estimate of the quality of the media.

However, the correlation between actual loss of information and the measured maximum PIE actually depends on several factors including the playback system as well as the media
quality. The PI errors of 280 are conservative levels chosen by the recordable DVD specifications as a predictor of the onset of uncorrectable errors.

JC: Data to Clock Jitter
Jitter measurements are used to indicate the occurrence of deviations from an ideal duration. The data on an optical disc is carried by the length of the pits and the distance between them. This data is extracted with a clock signal that is synchronized with the pit edges. Jitter measurements are done by monitoring the length of the pits and the distance between them (Data to Data Jitter), and by monitoring the length between the edges of the pits and the edge of the clock (Data to Clock Jitter).

Its value is given by the standard deviation of the length of the recorded marks. It mustn't exceed 8% for DVD-R and 9% for DVD+R of the 1T reference clock signal (38.2 ns).




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