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| Posted by | Jan S. |
| Posted on | 04/10/05 19:34 |
Writing Data CD-R/RW discs:
The specifications state that the drive should be able to write CD-Rs at 48x and CD-RWs at 24x:
The Lite-On SHW-1635S uses CAV (Constant Angular Velocity) to write CD-R's at 48x. This gives an average writing speed of 37.08x and a writing time of 2 minutes and 36 seconds.
The Lite-On SHW-1635S uses Z-CLV, (Zone-Constant Linear Velocity) to write CD-RWs at 24x. The average speed is 22.55xx and total writing time is 4 minutes.
In this first look, we did not include any quality scans of the CD-R/RW discs.
DVD-Writing performance:
The specifications of this drive tell us that it should write DVD+R DL/-R DL at 8x/4x, DVD±R at 16x and DVD+RW/-RW at 8x/6x.
DVD+R at 16x:
The Lite-On SHW-1635S uses CAV (Constant Angular Velocity) to write DVD+R at 16x. This gives an average writing speed of 11.92x and a writing time of 6 minutes and 12 seconds.
Above a Nero CD-DVD Speed Disc Quality scan and we can see the disc got a Quality score of 95.
Verbatim 16x DVD+R media, average writing speed of 11.92x, and a writing time of 6 minutes and 8 seconds.
Above a Nero CD-DVD Speed Disc Quality scan and we can see the disc got a Quality score of 97.
DVD+RW at 8x:
The Lite-On SHW-1635S uses Z-CLV (Zone Constant Linear Velocity) to write DVD+RW at 8x. The average speed is 7.73x and total writing time is 7 minutes and 30 seconds.
Above a Nero CD-DVD Speed Disc Quality scan and we can see the disc got a Quality score of 94.
Traxdata 8x DVD+RW media, average writing speed of 7.73x, and a writing time of 7 minutes and 54 seconds.
Above a Nero CD-DVD Speed Disc Quality scan and we can see the disc got a Quality score of 90.
DVD-R at 16x:
The Lite-ON SHW-1635S uses CAV (Constant Angular Velocity) to write DVD-R at 16x. This gives an average writing speed of 11.91x, and a writing time of 5 minutes and 53 seconds.
Above a Nero CD-DVD Speed Disc Quality scan and we can see the disc got a Quality score of 95.
Taiyo Yuden 16x DVD-R media - average writing speed of 11.93x, and a writing time of 5 minutes and 52 seconds.
Above a Nero CD-DVD Speed Disc Quality scan and we can see the disc got a Quality score of 97.
DVD-RW at 6x:
Traxdata 6x DVD-RW media, this 6x certified media is only supported at 4x (with the tested firmware). The average writing speed of 4.01x, and a writing time of 15 minutes and 14 seconds.
Above a Nero CD-DVD Speed Disc Quality scan and we can see the disc got a Quality score of 90.
The Lite-On SHW-1635S uses Z-CLV (Zone Constant Linear Velocity) to write DVD-RW at 6x. The average speed is 5.82x and total writing time is 10 minutes and 29 seconds.
Above a Nero CD-DVD Speed Disc Quality scan and we can see the disc got a Quality score of 92.
DVD+R DL at 8x:
The Verbatim DVD+R DL 2.4x media is supported at 4x with the tested firmware, so we made some modification and swapped some write strategies with the firmware to be able to write this media at 8x. (See below):
The Lite-On SHW-1635S uses Z-CLV, (Zone-Constant Linear Velocity) to write DVD+R DL at 8x. This gives an average writing speed of 6.93x, and a writing time of 17 minutes and 13 seconds.
The Verbatim 2.4x DVD+R DL disc burned at 8x got a quality score of 92.
DVD-R DL at 4x:
The Lite-On SHW-1635S uses CLV, (Constant Linear Velocity) to write DVD-R DL at 4x. This gives an average writing speed of 4.01, and a writing time of 27 minutes and 43 seconds.
The Verbatim 4x DVD-R DL disc burned at 4x got a quality score of 91.
Reading performance
It surely looks like CLV to me ... also the image says the same!
Very concerned about the dip during the 16x burns which results in a jump in jitter ... also overall high jitter, which usually mean poorly tuned writestrats and also lower disc lifetimes. Also - overall quality was shocking with some discs.
Wonder why you used a BenQ to scan? For speed only? I find BenQ tend to be less sensitive on some dyes (RICOHJPNR01 in my experience has less errors on BenQ than LiteOn) and heavily error on some others. Still trusting a LiteOn. Your efforts are appreciated a lot!
http://www.circuitcity.com/ssm/Lite-On-Internal-DVD-RW-Drive-SHW-1635S-/sem/rpsm/oid/132825/catOid/-12975/rpem/ccd/productDetail.do
[edited by Rudeseal on 25.10.2005 19:19]
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