Between two fires?

vbimport

#1

Hi - I have two ‘identical’ bulk Philips 1640s, cross-flashed by an identical process to BenQ EW1621 47L9 firmware; they’re in identical PL-3507-chipset external enclosures, also with identical firmware, & are connected through the same Firewire host to the same workstation.

One of these is for a friend, so I thought I’d run a few tests to make sure he got the better one. One of these test-series involved using CD-DVDSpeed 3.61 to repeatedly quality-test the same DVD - a ‘Datasafe’ brand MMC003 burned at 12x.

i’d be interested to see who in this forum comes to the same decision as I have: first, a compound snap of the figures from five runs in the first EW1621:


#2

Second, a compound snap of the figures from another five runs in the second EW1621 - (BTW - all runs in both burners produced the same ‘quality rating’ of 97%)



#3

Next; a compound of the PIFs from the same five runs in the first EW1621:



#4

. . then the same thing for the second EW1621:



#5

I’m interested in seeing the PI Errors. It seems that the only difference is how they are being read between 4GB and the end.


#6

The error pattern at the end of the disc on the first drive is in the low-solid-block pattern indicating a mild communication interference. Scanning at higher speeds is necessary to determine if greater errors are actually present on the disc.

Ah, scan the all of the output/test discs (from both drives) in just one drive (the second drive).
We can’t compare written output that is SO close without a common point of reference (write discs with both, but scan with just one drive).

Also, try the latest cd/dvd speed from cdspeed2000.com and manually set the scan speed to 12x as this [is the burn speed used and] will magnify the differences.

Next repeat the test using the first drive to scan all of the output/test discs. Use the same cable–do not switch cables or ports–switch only the drives.