11 Feb
2003
11 Feb
'03
4:30 p.m.
...But even 30 MB/sec should be far enough to get
dropout-free recording.
44100 * 16 * 2 (bit/sec) = 1411200 bit/s
44100*16*2/8 = 176400 byte/s = around 200 kB/sec.
See? Even if you play at the same time (duplex), your
30 MB/sec is far more than that.
One more thing, but be aware, I heard switching the
dma-transfer-rate might be dangerous
if you don't have the new 80pin cables. (right?)
Yes, I definatly have the cables.
you might want to check. "hdparm -i" which
gives you
some "*" on the options
that are set. see the "dma1 dma2 dma3 dma4 dma5" line,
which (in my case has the "*" at the dma4=100MB/secautomatically set.)
Here's what doesn't make sense to me. The Web Site that you referred
me to says:
"Ultra DMA modes, such as UDMA2, 4, and 5, are also referred to as
ATA/33, ATA/66, and ATA/100, respectively."
Now, the term "respectivly" means that mode 5 refers to ATA/100.
When I look at the output of "dmesg" I see the line:
"SiS730 ATA 100 controller"
And yet the output of "hdparm -i /dev/hda" lists"
Model=Maxtor 6Y080P0, FwRev=YAR41VW0, SerialNo=Y30HJLPE
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
BuffType=DualPortCache, BuffSize=7936kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=160086528
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive conforms to: (null): 1 2 3 4 5 6 7
There's not even a listing for udma5.
Since I keep reading all these warnings
about not trying settings that aren't supported,
should I try udma5?
Just in case I missed something (and I've been reading everything
can get my hands on for weeks now) here some info from my Mother
Board Manual:
The mainboard delivers high-level performance with support for...
<SNIP>
... and two PCI Bus Master Ultra DMA (UDMA) ports that support
up to four ATAPI devices. The PCI IDE also supports PIO Modes
3 and 4, UDMA33/66/100 IDE and an ATAPI CD-ROM
And further into the Mother Board Manual it says:
The built-in fast PCI IDE controller supports ATA Programmed
Input/Output (PIO) and Direct Memory Access (DMA) mode.
The Ultra DMA33/66/100 feature delivers data transfer rates
up to 100 MB/s by providing a separate data path for two
IDE channels and improving multi-tasking performance
Thanks
Rocco
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