Memorex DVD±RW True-8x- Page 4

DVD reading tests

- Single Layer DVD-ROM (Click for CDSpeed results)

The reading strategy of Memorex True-8x is CAV for single layer DVD-ROM media. The disc was read accurately reporting an average speed of 9.46x. The above graph shows that Memorex and Pioneer gave back almost the same results in all three reported speeds.

Just like CD media seek times, here too the seek times of single layer DVD-ROM needs a lot of improvement. For Full seek, Memorex needed 308ms and this value is much higher in comparison with the 178ms of Nec's. The results returned for Random and 1/3 modes are acceptable but higher than Nec's values.

- Dual Layer PTP DVD-ROM (Click for CDSpeed results)

The two layers of a PTP DVD-ROM disc are read sequentially with the drive starting the read process from the inner tracks of the disc, which is the beginning of each layer, and progressing outwards towards to the outer tracks for each layer.

On the Dual layer DVD-ROM reading test both Pioneer and Memorex gave back faster average reading speed values than Nec ND-2500A. Memorex reading strategy was CAV and the drive reached the maximum reading speed of 8.45x at the end of the test.

As expected from the single layer DVD-ROM, Memorex True-8x returned level Full seek times that overrun the acceptable level. The drive needed 305ms for Full seek, 132ms for Random seek and 157ms for 1/3 seek. On the seek times test of Dual layer DVD-ROM, Nec gave back the fastest access times in Full and 1/3 mode while on Random seek, Memorex proved to be the fastest.

- Dual Layer OTP DVD-ROM

The first layer of an OTP dual layer DVD-ROM is read in the exact way as the first layer of the PTP disc we tested previously. The difference here is the reading strategy of the second layer on the disc. The beginning of the second layer is located in the outer part of the disc, so the drive starts reading from the outer tracks inwards towards the inner tracks of the disc.

Dual layer OTP written disc was read by Memorex with and reported 6.28x average speed. The starting speed at the begriming of second layer was 8.37x. The above screen shot was taken from NeroCDSpeed indicating that the disc was read accurately, under CAV mode. The access times of Memorex with Dual layer OTP are 306ms for Full seek, 136ms for Random and 158ms for the 1/3 seek test.

- DVD Ripping Tests

We measured the DVD-Video ripping speed of the Memorex True-8x using the latest version of DVD Decrypter. The DVD Video title is the "Matrix" pressed DVD-Video.

On the above graph we can see that the Nec is the fastest among the three drives on the DVD ripping test. The results of Memorex and Pioneer are similar with average ripping speed about 4.3x

- DVD Recordable / Rewritable reading Tests

The chart below shows the Nero CDSpeed average reading speed results with the following media.

• 8x DVD+R
• 4x DVD+RW

• 8x DVD-R
• 4x DVD-RW

All recordable / rewritable media tested were read under CAV mode by Memorex True-8x. On the plus DVD format the rewritable media was read faster than the recordable while on the minus format both recordable and rewritable media gave back alike average reading speed.

- DVD RAM reading test

According to manufacturer Memorex True-8x supports DVD-RAM reading. To test the reading performance of Memorex we used NeroCDSpeed and Maxell DVD-RAM certified at 3x.

The disc was readen under CLV mode with average reading speed 1.98x. Again, the Full seek times are increased.