Data reading tests:
First a test using Nero CD-Speed, the CD we used for the testing was a CD-R filled with data, the total length was 80 minutes and 25 seconds.
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This picture shows the Mitsumi at reading the data disc.

This picture shows the Lite-On at reading the data disc.
And then a test using Transferspeed:
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The Mitsumi.

The Lite-On.
Data reading performance summary:
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Both drives were able to deliver the rated speed. The Lite-On is faster, but only by a hair. On the other side the Mitsumi has better seek times. Since seek times are more important in practical use than the small performance difference, the Mitsumi is the winner here.