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CPU usage when burning vs CD Speed Simulation

PostPosted: Fri Jun 06, 2003 7:52 pm
by CDRecorder
On one of my Celeron 366 PCs (with LTR-32123S XS0Z), I have noticed that CPU usage is between 0 and 10 percent when running a CD Speed simulation at 32x, but it is between 90 and 100 percent when burning a 74-min ISO with Nero from the hard drive at 32x. Has anyone else noticed anything like this?

Edit: With a LTR-48125W on this computer, CD Speed will allow 48x burning, but I can't burn at 48x without the buffer-underrun protection being used frequently.

PostPosted: Fri Jun 06, 2003 9:10 pm
by Ian
Do you have DMA enabled for your hard drive too?

PostPosted: Sat Jun 07, 2003 2:04 am
by CDRecorder
Yes, the hard drive is running in UDMA Mode 2, according to the PCI ATA133 controller card driver.

It's an old hard drive, but a new (ATA133) drive hooked up to the motherboard's integrated ATA33 controller did the same thing.

The reason that my HDD is only UDMA mode 2 is that my new drive turned out to be defective, so I exchanged it for another (which had the same defect). I bought the ATA133 card at the same time as I exchanged the drive hoping for better performance. Nero's test (in the Preferences dialog box) says that the current hard drive can transfer data at 13,846 KB/s.