Section 5. Advanced Features and PlexTools Professional
PX-716 Installation and Users Manual 87
Your choices for error display are as follows:
• SUM8: Displays total number of detected PI errors, known as “PI-
Sum8,” in 8 consecutive ECC blocks. The maximum allowable value
of PI-Sum8 is 280 or less. The result of this measurement includes
burst error which may be corrected by the PO stage.
• SUM1: Displays number of PI-uncorrectable rows in 1 ECC block.
According to DVD standards, this value should not exceed 4.
However, it may be corrected if the value is over 4. This
measurement can check for defects, fingerprints, or media damage.
• Basic: Displays number of bytes of corrected PI error in 1 ECC
block. This measurement does not include burst error, so it is
correlated with jitter. This measurement can check the quality of a
written disc.
• Burst: Displays burst errors.
The existence of PI/PO errors on a DVD is perfectly normal, since they
can be corrected by the drive's CIRC logic. However, these numbers
should not be too high, because they can create uncorrectable errors
when the disc's playability decreases (for instance, because of dust,
fingerprints, scratches, etc). As for POF errors, these cannot be repaired,
so the occurrence of a POF is not acceptable. With POF errors, there is a
chance that the data will become unreadable.
TA Test
The Time Analyzer (TA) test analyzes the lands and pits of a disc and
produces a histogram of T3-T11 and T14. You can use this test as a
visual indication of the quality of a disc.
This test is for use on all types of DVD media (-R/RW/DL, +R/RW/DL)
that you have recorded. It’s not for use with a commercial pressed DVD.
Since the TA test analyzes the pits and lands, the disc must have data
recorded on it.
NOTE: The current PX-716 TA test does not support CD-R/RW media.
Support will be provided by a firmware upgrade. See page 92 for details
on how to upgrade your drive’s firmware.
