On Wed, Jul 16, 2003 at 09:11:02AM +0200, Markus Plail wrote:
> On Wed, 16 Jul 2003, Matthias Schniedermeyer wrote:
>
> >On Wed, Jul 16, 2003 at 12:54:03AM +0200, Norbert Preining wrote:
> >> I have two questions concerning burning with/without burn-free:
> >>
> >> The first: How fast is it theoretically possible with an UDMA100
> >> harddisk to burn *without* burnfree protection? If I burn with my
> >> plextor premium at full speed I would always get buffer underruns.
> >
> > With the upcoming Linux-2.6 Kernel you will be able to burn with full
> > speed because the 2.6-Kernel can talk to the burner in DMA mode.
> > Current 2.4 Kernel isn't capable of doing this.
>
> That's only true for non 2048 block sizes (audio, (S)VCD, RAW)).
Actually, I have 4 52x burners on a UDMA100 chipset (AMD 760MPX
Southbridge). The hard drives are on their own UDMA133 controller
(Promise 20269). I can burn to all four at full speed on linux 2.4.20
without dipping too far into the writer cache, where full speed is 24x
at the hub and 52x at the rim.
...now, that took some fiddling to achieve; most of the controllers
(and possibly corresponding kernel drivers) I tried were *awful* at
handling atapi devices. Welcome to the world of consumer-grade
hardware. Even the $200 ATA133 add on cards never seemed to get > 16x
if they worked properly at all. The only controller/driver combo I
found that worked beautifully happened to be the onboard Southbridge
itself... so I moved all the CDROMs to the Southbridge controller, and
the hard drives to the add-on controller (which sucked for CDROMs, but
works beautifully for hard drives).
Monty
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