I have a Benq 1650 DVD writer in an AMD Athlon 2400+ system. Burning with speeds up to 12x works fine but when I try 16x, my computer can't send the data fast enough. Due to CAV, the data rate at the beginning of the burn is ok. It increases over the time, and at approx. 3/4 of a full DVD the computer can't send the data fast enough any more. The drive slows then down to 4x speed and finishes the disk slowly (thus needing more time than for a 12x burn).
I thought that I avoided the usual pitfalls (DMA mode...) but do not understand why my system is too slow. Some information about my hardware:
CPU: AMD Athlon XP 2400+ @ standard 2000MHz
Mainboard: Asus A7V8X
RAM: 512 MB DDR-RAM
OS: Windows XP Prof. SP 2
HDD: 2 Seagate drives, 40 GB and 250GB, 7200 rpm, with UDMA 100 interface, both on primary IDE channel, with correct DMA 5 mode according to BIOS and Windows
Secondary IDE channel: A LG CD writer and the Benq 1650 DVD writer, both in DMA 2 mode
Removing the CD writer from the bus does not help. Besides the problem was exactly the same when I borrowed an LG 16x-DVD writer.
Any idea what's wrong with my system? The harddisks should be fast enough. The data is not fragmented, either. Also, the CPU is not too busy while burning: the load stays easily under 50% while burning.
Can someone help me and figure out why the data goes not fast enough from the harddisk to the DVD writer?
Many thanks for your help, Johann