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Home > Hardware Reviews > Optical Storage

Tuesday, November 10, 2009
Sony DVDRW DRX-S70U-W

2. CD/DVD reading tests

For our CD/DVD transfer rate tests we used the Nero Disc Speed utility and a set of data and audio CD-R/RW/ROM media. DVD recordables/rewritables and DVD ROM discs were used in order to check the reading performance of the drive. Notice that here we test the maximum reading speed of this drive with each kind of disc.

-CD-ROM

- US RW

The following CD Speed graph shows the reading performance with US-RW media.

- AudioCD

In the CD Speed Advanced DAE quality test, the drive's average speed was 18.13X with a quality score of 100.

- CD DAE

Digital Audio Extraction or DAE is important when we try to read the files stored on an audio CD and store them in our hard disk drive. The procedure is not always that simple and the fidelity of the extracted data depend on the way each drive handles these data.

The majority of the software that support this procedure, commonly known as "ripping", will just read the audio files and store them on your hard disk. However, this approach is not recommended for all drives, since it may result to read or sync errors if your drive does not support report of C2 error pointer information and also what the author of the EAC (Exact Audio Copy) software describes as "accurate stream" and " non-caching."

According to EAC, the Sony DRX-S70U-W drive does not support "caching ", but it supports "Accurate stream" and reports "C2 error" pointer information.

Accurate stream and C2 error reporting is always welcome and contribute to reliable and fast audio extraction. Generally, if you select a drive for extraction better have a look that the drive does not cache audio data.

A typical ripping task finished at an average reading speed of 15.3X, using the Exact Audio Copy software (EAC):

- 90 mins Audio disc

90min Audio disc

A read error with the 90min data CD.

- DVD Format

Now let's take a look at how the drive performs with DVD media. This time, a set of SL and DL DVD media was used. The drive is capable of reading at 8X maximum speed for single layer DVD ROM and at 4X for dual layer DVD ROM media.

DVD-ROM SL media -

 

PTP DVD-ROM -

The two layers of a PTP DVD-ROM disc are read sequentially with the drive starting reading from the inner part of the disc, which is the beginning of each layer, progressing towards its outer range.

 

The specific disc was read at 4x CAV and not at 6x as we were expecting.

OTP DVD-ROM -

The first layer of an OTP dual layer DVD-ROM is read exactly the same way as the first layer of the PTP disc we tested previously. The difference here is the reading strategy of the second layer of the disc. The beginning of the second layer is located in the outer part of the disc, so the drive starts reading from the outer tracks and progresses towards the inner part of the disc.

 

DVD-R

DVD-RW

 

DVD+R

 

DVD+RW

DVD+R DL

 

DVD-R DL

There is an issue here with the DVD-R DL discs. The drive gave back a read error.

DVD Ripping speed -

Ripping of a single layer DVD movie:

Average 2.106 KB/s (1.5x)
Maximum 15.389KB/s (3.9x)

Summary

The reading process of almost all media was completed without read errors, but the drive was slower than expected with the DVD-ROM DL PTP discs. In addition, the drive could not read the DVD-R DL disc.




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