716A read transfer rate problem?

vbimport

#1

Dear Plextor-users,

I would like your input on a somewhat strange behaviour of my 716A.
Without doing any tests afterwards the plextor does do his job just fine so it seems. When when checking the write-quality PIE PIF POE POF it shows that the plextor likes certain brands better than other brands. Sofar nothing new under the sun.
The strange thing comes when doing a Read Transfer Rate Test.
Its the first spike(s) downwards at a speed between 5.5 and 5.6
The strange thing about that spike is that the size of it changes/increases usually when doin the read-test several times.

Sofar this has been the case with 2 brands, I have attached the results of the Verbatim DVD+R 8X@8X MCC003 and the Sony DVD+R 8X@8X D11

I also burned a couple of DVD+R Ricohjpnr02.
They all have good PI/PO Test results (like the sony DVD+R’s)
But the read transfertests look awful, I will show you one of them.

Should I worry about the rather big downspikes at a speed of 5.5-5.6?
Why do the big spikes with quality-media only happen at that speed?

The DVD’s work just fine, its the “Read Tranfer Rate Test results” that I worry about.
I am not quite sure what to think of it.
What do you Plextor-users think of it?
What should I do?

Thanks in advance for your replies,suggestions

Neo

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Microsoft Windows XP Home Edition
OS Service Pack Service Pack 2

Intel Pentium 4E, 2800 MHz (3.5 x 800)
Biostar P4TSE (Pro)
Intel Springdale i865PE
512 MB (DDR SDRAM)
NVIDIA GeForce4 MX 440 with AGP8X (64 MB)

2x Maxtor 6Y120P0 (120 GB, 7200 RPM, Ultra-ATA/133)
PLEXTOR CD-R PX-W5224A (52x/24x/52x CD-RW)
PLEXTOR DVDR PX-716A Firmware 1.04


#2

First guess: Misalignment induced vibration or troubles with balancing.

It’s the same problem as with the wheels of your car. You can let them align to have less vibrations on the bearings.
This is needed for example: when 1 side of the wheel is heavier then the other site because of a missing piece of metal or when a wheel has an abnormal curve because of an accident or …
At certain speeds, resonance occurs with vibrations as result.

search with google for: balancing resonance vibration