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DVD Read Tests
We
will be using Nero 6 Ultra Edition CD-DVD Speed for these tests. We will
be testing both single layer and dual layer DVD's. For the dual
layer tests, we will look at both PTP and OTP disks. For those who are
unfamiliar with the way DVD discs are created, I will briefly try to describe
the methods without getting too technical before we begin.
Dual
layer discs are more than 4.38GB in size. There are two ways in
which they write these discs. One is PTP, which stands for parallel track
path, and the other is OTP which stands for opposite track path. In PTP
discs, both layers read from the inside of the disc to the outside while OTP
discs read from the inside to out and then back in for the inner layer. This
allows the drive to read both layers almost continuously, with only a short
pause to refocus the pickup lens. This is particularly useful for
movies, where long play time without interruption is required.
1.
CD-DVD Speed - Single Layer DVD
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Test Results |
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Transfer Speed
Average:
8.59x
Start: 4.83x
End: 11.41x
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Seek Times
Random: 109ms
1/3: 111ms
Full: 65ms
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CPU Usage
1X: 8%
2X: 14%
4X: 27%
8X: 53% |
The transfer rates were impressive. It
maxed at 11.41 which is just slightly under its rated 12x read for DVD-ROM
discs. Seeks times were extremely low.
2.
CD-DVD Speed - Dual Layer PTP DVD
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Test Results |
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Transfer Speed
Average: 3.07x
Start: 3.83x
End: 2.16x
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Seek Times
Random: 101ms
1/3: 153ms
Full: 185ms
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CPU Usage
1X: 8%
2X: 15%
4X: 100%
8X: 100% |
Read tests on dual layer DVD's was another
story. The average speed was only 3.07x and seek times were higher.
3.
CD-DVD Speed - Dual Layer OTP DVD
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Test Results |
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Transfer Speed
Average:
2.97xx
Start: 3.87x
End: 2.10x
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Seek Times
Random: 100ms
1/3: 153ms
Full: 190ms
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CPU Usage
1X: 8%
2X: 15%
4X: 100%
8X: 100% |
Result on the OTP disc was
similar to the dual layer PTP, only averaging 2.97x. Seek times where
about the same.
4. CD-DVD Speed - DVD-R, DVD-RW,
DVD+R, DVD+RW
We ran the same tests using all
other supported formats. Below is a chart of the results.
The Optorite DD0203 supports 4X
read for DVD-R, DVD-RW, DVD+R and DVD+RW. The results were all up to
specifications. Excellent.
Note that we did not include
results for DVD-RW because we could not find compatible media at time of
review. We tried numerous retail store brands such as memorex,
fuji and imation but none were recognized by the drive.
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