ForumLG GSA-H50N detail information
| Posted by | agent009 |
| Posted on | 18/07/07 07:51 |
| Number of views | 30117 |
| Manufacturer | LG |
| Product | LG GSA-H50N |
| Description | 18x Super Multi DVD Rewriter |
DVD+R writing quality
In DVD writing tests below, we will use Nero CD-DVD Speed to write DVDs at the maximum speed supported by LG GSA-H50N.
We will use Nero CD-DVD Speed to write DVDs at the maximum speed supported by LG GSA-H50N.
We will then test their quality using a BenQ DW1680 drive and KProbe 2, a software tool developed by a Lite-On employee. Quality scans will be conducted at the scanning speed of 4x, our standard speed for Lite-On DVD scanning. (Note that different scanning drives and speeds may dramatically alter results obtained in quality tests.)
In DVD quality tests, the testing drive reports two types of errors: PI (Parity Inner) errors (PIE) and PI failures (PIF).
In practice, a pressed or recorded DVD will always have some PI errors and PI failures. PI errors are easily corrected by the drive's error correcting decoder.
PI failures are the next level of errors. While PI failures are corrected by the second and last stage of the error correcting decoder, they are a more dangerous kind of errors because they can overwhelm the error correcting decoder if they occur in large enough numbers. A good-quality DVD should not contain PI errors above 280 or PI failures above 4.
Beyond PI failures, there are PO (Parity Outer) failures that are uncorrectable and make a disc unreadable.
To see if there is a connection between the reported amount of errors and the readability of discs we will include reading curves from Nero CD-DVD Speed transfer rate tests performed on an LG GSA-H42N drive. We will be looking for any drops in transfer rates which would indicate readability issues with the discs created by LG GSA-H50N.
In the tests below, we will explore DVD+R writing speed and quality of LG GSA-H50N with media from several manufacturers.
Verbatim 16x DVD+R
Verbatim 16x DVD+R
(Thanks to Verbatim USA for providing this media)
Disc creation
Quality test
Transfer rate test
Great quality, especially considering 18x overspeeding.
Note that the quality scan has three PIF=5 spikes aligned with some of the OPC (optimal power control) stops. While they are harmless, they do indicate that data linking that occurs at OPC stops is not as precise as it was in this drive's predecessors.
Another quality scan with a BenQ drive does not show the same problem, reinforcing our conclusion that occasional OPC-related PIF spikes are not a problem:
Quality test (Benq DW1640)
Sony 16x DVD+R
Sony 16x DVD+R
Quality test
Transfer rate test
An excellent result from Sony media, oversped to 18x.
Taiyo Yuden 16x DVD+R
Taiyo Yuden 16x DVD+R
(Thanks to Rima.com for providing this media)
Quality test
Transfer rate test
A predictably great result from Taiyo Yuden media, oversped to 18x.
Maxell 16x DVD+R
Maxell 16x DVD+R
(Thanks to Maxell USA for providing this media)
Quality test
Transfer rate test
Imation 16x DVD+R
Imation 16x DVD+R
Quality test
Transfer rate test
A very good burn. Something is going on at the end of the disc that affects readability, but error level are too low to declare it a problem.
Ridata 16x DVD+R
Ridata 16x DVD+R
(Thanks to Ritek USA | Advanced Media, Inc. for providing this media)
Quality test
Transfer rate test
An outstanding, very clean burn.
ESA 8x DVD+R
ESA 8x DVD+R
Quality test
Transfer rate test
A great burn on cheap media sold in the U.S. by Circuit City.
Summary
LG GSA-H50N is an excellent DVD+R writer, producing consistently excellent results with all media we tested.
DVD+RW writing quality
In the tests below, we will explore DVD+RW writing speed and quality of LG GSA-H50N with media from several manufacturers.
Ridata 8x DVD+RW
Ridata 8x DVD+RW
(Thanks to Ritek USA | Advanced Media, Inc. for providing this media)
Quality test
Transfer rate test
An excellent high-speed DVD+RW burn.
Memorex 8x DVD+RW
Memorex 8x DVD+RW
(Thanks to Memorex USA for providing this media)
Quality test
Transfer rate test
Summary
LG GSA-H50N is a very good DVD+RW writer, producing excellent burns with 8x DVD+RW media we tested.
CD-R and CD-RW writing quality
One thing I would advise against is using any LG drive for TRT. Those drives have no problems with extremely poor burns. I have had a severely degraded Ritek G05 that would not read at all in any of my liteons, I put it in my LG and it did not slow down once during the rip. I've noticed this on a number of poorly burnt discs in the past and I have two LG drives to confirm that they are very good readers, too good when it comes to TRT.
This message was edited at: 22-07-2007 08:05
Many things besides the quality of the disc can go wrong at high reading speeds. 16x DVD speeds mean interpreting 56 meters/180 feet per second of track covered with microscopic bumps. It makes me think of reading highway signs written in Braille - at supersonic speeds
The whole thing is a bit of a black art... a reading test can show a hint of a problem where the quality test sees none, and vice versa. The best we can do is to pick one reading drive for a review and stick with it until there is an apparent contradiction between a quality test and a reading test, as was the case here.
O meu dvd não abriu o computador e não roda nada!!!
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