DVD-R, DVD-RW and DVD-R DL writing tests
Note:
For a full explanation and fuller understanding of the tests we carry out here please see page 2. Below is a brief reminder of what each test can tell us.
PIE: Indicates the number of Parity Inner Errors and should not exceed 280 with single spikes above this level usually ignorable.
PIF (Parity Inner Fail): indicates the number of PI Errors and should not exceed 4 with single spikes above this level usually ignorable.
Beta: the beta value is an indication of how well the recorded signal pits and lands are in balance. A horizontal line would mean perfect balance and would give the best readability result.
Jitter: this function shows the average jitter rate in the 3T~11T range. A lower jitter will give better results for readability and less chance on (un)correctable errors.
All tests in this section of the review are completed using the drives maximum recording speed for any given media. The firmware used for all these recordings on the NEC ND-4550 with the latest available firmware 1.06 available from the link on page one of this review ( at the bottom of the 'other' section the specifications table ).
During the scanning we dicovered that our Liteon 1673S was unable to scan some of the high speed DVD+/-RW media and so for these results will be done using the PIE/PIF test in PxScan. Although a different scanner to the Liteon we are still looking for PIF under 4 and PIE under 280 with single spikes outside these limits ignorable. For all other DVD+/-RW results the Liteon 1673S will be used as normal.
The DVD-R media support was very good overall with all the tested brands of media attaining at least their maximum rated speed. Sometimes faster than rated speed was achieved with the likes of the Sony and Maxell 8x media achieving 16x under present firmware. All the tested 16x DVD-R media was supported at its rated speed.
At the time of writing this article only 2 types of DVD-R Dual Layer media where available to us for testing. The NEC ND-4550 offered some very good high speed DVD-RW support with both the Traxdata and Verbatim 6x DVD-RW media at their rated speeds. All other tested media also achieved their rated speed.
One final test we carried out on the NEC ND-4550 in this section of the review was to see if it was possible to over burn DVD-R media past its rated capacity of 4481 MB. As you can see, according to Nero CD Speed, the NEC ND-4550 is unable to overburn to DVD+R media. Although not always a good idea, sometimes just getting that extra 10-20 MB out of your media can save some headaches such as recompressing,leaving out of files or spanning across 2 DVDs.

A lot of media used in this review has been reviewed indepth on a number of popular DVD Writing devices in our Media Review Section. Please have a browse through these reviews to see how well the NEC ND-4550 did compared to our other tested writing devices.
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