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DVD Read Tests
As in
all our our DVD reads 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 these methods, I will briefly try to
describe them 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.
One
thing I particularly like about Lite-On drives is that they don't contain
firmware that incorporates a "rip lock" on DVD-Video discs. This makes
them quite speedy and excellent DVD rippers as well. Let's have a look
at the results of our read tests.
1.
CD-DVD Speed - Single Layer DVD
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Test Results |
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Transfer Speed
Average:
12.16x
Start:
6.75x
End:
16.27x |
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Seek
Times
Random:
113ms
1/3: 129ms
Full:
199ms |
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CPU
Usage
1X: 7%
2X: 10%
4X: 20%
8X: 98% |
The
results on single layer discs are nothing short of impressive. In fact,
these are the highest transfer rates I've personally seen to date.
As you can see, there is no lock and maximum transfer rate was a super speedy
16.27x. While the seek times where slightly higher than their
previous models, the CPU Usage rates were lower. You can see that the
average transfer rate was 12.16x. This drive should do very well in our
ripping tests, which we will get to later.
2.
CD-DVD Speed - Dual Layer PTP DVD
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Test Results |
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Transfer Speed
Average:
5.64x
Start:
2.63x
End: 6.98x |
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Seek
Times
Random:
109ms
1/3: 113ms
Full:
172ms |
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CPU
Usage
1X: 6%
2X: 10%
4X: 20%
8X: N/A |
Performance on dual layer discs were on par with their 8x drive. Maximum
transfer rate was just under 8x on a PTP DVD-Video. We also continue to
see lower CPU usage here as well.
3.
CD-DVD Speed - Dual Layer OTP DVD
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Test Results |
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Transfer Speed
Average:
6.23x
Start:
3.43x
End: 8.20x |
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Seek
Times
Random:
120ms
1/3: 129ms
Full:
200ms |
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CPU
Usage
1X: 6%
2X: 9%
4X: n/a
8X: n/a |
Results on OTP DVD-Video were slightly better,
achieving a maximum transfer rate of 8.20x. Seek times were higher but
still considered low.
4.
CD-DVD Speed - DVD-R, DVD-RW, DVD+R, DVD+RW
Now
let's take a look at the maximum transfer rates on all recordable media.
Maximum read speed was recorded from all formats and shown in the table below.
Don't expect 16x transfer rates like we saw with
the NEC ND3500A. Maximum read rates seem to max in at 8x with all
recordable media formats. I was expecting higher transfer rates
considering it is a 16x writer so I was a little disappointed with these
results.
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