Samsung SN-S082M Slim Drive Review

 

DVD-Writing performance:


The specification of the drive states that it is able to write DVD+R/-R with up to 8x speed and DVD+RW/-RW media with up to 8x/6x speed. In this part, we will measure the writing times for various types of DVD+R/RW and DVD-R/RW discs. We will also focus on write quality and media compatibility.

DVD+/-R writing with Nero 7

In this test we will measure the time for writing to DVD±R discs. We used Nero Burning Rom to burn an ISO compilation containing 4462MB of data. We used the Disc-At-Once write method.

Samsung SN-S082M Slim Drive Review

DVD+R

Samsung SN-S082M Slim Drive Review

DVD-R

 

Write quality:


You should first notice that this is not a scientific and professional way to test the discs. But according to our testing done in recent months, we would conclude that there is a clear link between the quality reported when scanning the disc and the playability of the disc in different devices. Also notice that different drives report different amounts of errors. K-Probe was designed to work with Lite-On DVD-Writers, so we recommend using a DVD-Writer from Lite-On. In this test we use a Lite-On SHM-165P6S DVD-Writer, as already said; remember that scans done with a Lite-On DVD-ROM or Lite-On combo drive can’t be compared with the results obtained with a Lite-On DVD-Writer. Also remember that different PI/PO ECC sum settings along with different reading speeds in K-Probe will affect the result, we use these settings;  PI (Parity Inner) set to summarize 8 ECC blocks, PIF (Parity Inner Failures) set to summarize 1 ECC block, reading speed: 4X CLV (Constant Linear Velocity). Setting the PI sum to 8 and the PIF sum to 1 will give a result that we may compare to the standards for DVD+R/RW and DVD-R/RW.

But what is a good scan? That is a discussion that we don’t think will end soon, as different drives report different amount of errors, some players are more picky about media than others, and so on. But as a comparison we present you with a scan from two pressed DVD discs:

Samsung SN-S082M Slim Drive Review

This scan shows the results from a pressed DVD-Video disc (GoldenEye).

 Samsung SN-S082M Slim Drive Review

This scan shows the result from a pressed DVD-Video disk (The Green Mile). Notice the error jump when shifting to the second layer (the error level actually drops from the end of the first layer to the beginning of the second layer).

If you read below, you will see that both the pressed DVD-discs are well within the standards.

Download the ECMA 267 Standard for DVD-ROM, the ECMA 337 Standard for DVD+R/RW and the ECMA 338 Standard for DVD-R/RW at http://www.ecma-international.org if you want to look at the standards for yourself. Here is some data from the ECMA standards (same for DVD-ROM, DVD-R/RW and DVD+R/RW):

Random errors:

A row of an ECC Block that has at least 1 byte in error constitutes a PI error. In any 8
consecutive ECC Blocks the total number of PI errors before correction shall not exceed 280.

Here we see that a PI error is defined as a row in an ECC block having 1 byte or more containing errors and that the sum of PI errors in 8 ECC blocks after each other should not exceed 280 PI errors.

But what is a row and what is an ECC block? Again we refer to the ECMA standards. We do not copy and paste everything, but if you’re interested, look in the ECMA standards. A row is 182 bytes long where the last 10 bytes contain PI (Parity Inner) information. An ECC block is 208 rows long where the last 16 rows contain the PO (Parity Outer) information. This gives us a maximum possible PI error amount of 208 errors per block and for 8 blocks after each other this sum is of course 8 times higher, giving a maximum possible amount of 1664 PI-8 errors. In practical use, a disc with 1664 PI-8 errors is unreadable.

According to our tests the specified max PI-8 sum of 280 for good discs seems to be a good guideline, as some readers have problems reading discs when the PI-8 errors is over 300 and most players starts to have problems when the PI-8 error level reaches 600 or more.

But what are the PIF errors that K-Probe reports? They are Parity Inner Failures, meaning errors left after PI correction. Only the ECMA 337 standard describes the Parity Inner Failures. So how is a Parity Inner Failure defined? Here is what the ECMA 337 states:

“If a row of an ECC Block as defined in 13.3 contains more than 5 erroneous bytes, the row is said to be “PI-un-correctable”.”

In theory, an ECC block may in the worst-case have 208 PIF since every ECC block is 208 rows long. But the ECMA 337 standard goes further and specifies the max amount of accepted PI Failures (un-correctable errors) allowed on a good disc:

“In any ECC Block the number of PI-un-correctable rows should not exceed 4.”  

This means that when the PIF sum is set to 1, the maximum error value should not exceed 4. The theoretical maximum value for PIF is 208 errors.

But what makes a disc unreadable? A POF (Parity Outer Failure) error will make the disc unreadable, but K-Probe does not display the POF’s.

Notice that there are other aspects such as disc reflectivity, jitter, tracking errors and so on that also will affect the readability of a DVD disc – but for this we do not have measuring equipment available.

Also, another note is that we have scanned the discs at 4X CLV speed, by lowering the speed to 2X(DVD-R/RW)/2.4X(DVD+R/RW) or 1X the amount of reported errors may drop on some discs. We scanned at 4X CLV due to lower speeds taking too much time.

To see if there is a connection between the reported amount of errors and readability of the discs we also include the reading curve from a Optiarc AD-7173A DVD-Writer. The reason why we have changed the reader is that some companies disliked that we used a modified firmware to obtain 16x reading speed. So to please them, we are now using a drive that reads DVD+R/-R media at 16x as default. A small speed reduction near the end is still accepted on good discs, but serious reading problems or reading failures is a bad sign.

Easier explanation on how to read the test results.


Maybe this got too technical, and you are wondering what to look for in KProbe reports?

Use this as a guideline for good discs:

·         PI (Parity Inner): No larger areas on the disc should exceed 280 PI-8 errors, do not worry too much about high single spikes that exceed 280.

·         PIF (Parity Inner Failures): No larger areas on the disc should exceed 4 PIF-1 errors, do not worry too much about high single spikes that exceed 4.

And as always; lower is better Samsung SN-S082M Slim Drive Review

And look at the reading curve; if it looks clean with no dips it should be good, a small slowdown near the end is accepted.

DVD+R media compatibility and write quality:


In these tests we will be using the Lite-On LH-20A1P with firmware KL05 along with KProbe to measure the disc quality. We will also be using the Lite-On LH-20A1P with firmware KL05 along with CD-Speed for our read-back tests.

 

 

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Miflop Extreme – Thanks to Miflop
for sending us this media.

Manufacturer:

Taiyo Yuden Company Limited

Code:

YUDEN 000 T03

Disc Type:

DVD+R

Capacity:

4483MB

Certified Speed:

16x

Write Speed:

8x

Write Time:

11m:47s

PI-8 errors Average/Sec:

11.38

PI-1 failures (PIF) Avg/Sec:

0.03

Miflop extreme media with Taiyo Yuden media code, the result is excellent.

 

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Verbatim – Thanks to Verbatim (Germany)
for sending us this media.

Manufacturer:

Mitsubishi Chemicals Corporation

Code:

MCC 004

Disc Type:

DVD+R

Capacity:

4483MB

Certified Speed:

16x

Write Speed:

8x

Write Time:

10m:57s

PI-8 errors Average/Sec:

1.37

PI-1 failures (PIF) Avg/Sec:

0.05

The result is excellent.

 

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Datawrite – Thanks to E-net
for sending us this media.

Manufacturer:

Prodisc Technology Inc.

Code:

ProdiscR03

Disc Type:

DVD+R

Capacity:

4483MB

Certified Speed:

8x

Write Speed:

8x

Write Time:

11m:00s

PI-8 errors Average/Sec:

7.32

PI-1 failures (PIF) Avg/Sec:

3.30

A bad result, the TRT Lite-On LH-20A1P shows problems with reading at the position with high PIF. Other readers might have more problems with that disc and it’s possible that the disc appears to be unreadable in other drives.

 

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Ricoh

Manufacturer:

Moser Bear India Limited

Code:

MBIPG101R04

Disc Type:

DVD+R

Capacity:

4483MB

Certified Speed:

16x

Write Speed:

8x

Write Time:

11m:58s

PI-8 errors Average/Sec:

0.61

PI-1 failures (PIF) Avg/Sec:

0.01

Excellent. One of the best results we had with this drive.

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Datawrite – Thanks to E-net
for sending us this media.

Manufacturer:

Prodisc Technology Inc.

Code:

ProdiscR04

Disc Type:

DVD+R

Capacity:

4483MB

Certified Speed:

16x

Write Speed:

8x

Write Time:

11m:01s

PI-8 errors Average/Sec:

3.10

PI-1 failures (PIF) Avg/Sec:

0.01

The result is excellent.

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Traxdata DVD+R

Manufacturer:

Ricoh Company Limited

Code:

RICOH JPN R03

Disc Type:

DVD+R

Capacity:

4483MB

Certified Speed:

16x

Write Speed:

8x

Write Time:

10m:56s

PI-8 errors Average/Sec:

0.59

PI-1 failures (PIF) Avg/Sec:

0.12

Another very good result.

DVD+RW media compatibility and write quality:


We used the same test procedures as in our DVD+R tests.

Below are our obtained results.

 

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Ricoh – Thanks to Ricoh Europe
for sending us this media.

Manufacturer:

RICOH Company Limited

Code:

RICOH JPNW21

Disc Type:

DVD+RW

Capacity:

4483MB

Certified Speed:

8x

Write Speed:

4x

Write Time:

15m:29s

PI-8 errors Average/Sec:

20.58

PI-1 failures (PIF) Avg/Sec:

0.33

The drive wasn’t able to burn the media at its rated speed but the result is good for this DVD+RW media.

 

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Verbatim – Thanks to Verbatim (Germany)
for sending us this media.

Manufacturer:

Mitsubishi Chemicals Corporation

Code:

MKMA02

Disc Type:

DVD+RW

Capacity:

4483MB

Certified Speed:

4x

Write Speed:

4x

Write Time:

16m:04s

PI-8 errors Average/Sec:

7.89

PI-1 failures (PIF) Avg/Sec:

0.55

Overall a good result for this Verbatim 4x DVD+RW

Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review
Samsung SN-S082M Slim Drive Review

Brand:

Traxdata – Thanks to Conrexx Europe
for sending us this media.

Manufacturer:

RiTEK Corporation

Code:

RITEK 008

Disc Type:

DVD+RW

Capacity:

4483MB

Certified Speed:

8x

Write Speed:

4x

Write Time:

15m:29s

PI-8 errors Average/Sec:

186.80

PI-1 failures (PIF) Avg/Sec:

0.24

The media wasn’t burned at its rated speed. It contains Very high PIE but relatively low PIF and the disc is perfect readable. A mixed result.

 

Summary:

The Samsung SN-S082M produced good results on the DVD+R media type and mixed results on the DVD+RW media type. Also, the drive wasn’t able to write any tested DVD+RW 8x media at its rated speed.

 

On the next page we are going to take a look at DVD-R/RW writing performance…