hdparm on iBook G4
Hi,
today I read a cd with only treble speed. I run hdparm and saw it runs on
mdma2. Is this more than udma2? I tried to set the later, but since this
all accesses to the cdrom hang and never returned.
# hdparm /dev/cdrom
/dev/cdrom:
IO_support = 0 (default 16-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Invalid argument
# hdparm -i /dev/cdrom
/dev/cdrom:
Model=MATSHITACD-RW CW-8123, FwRev=CA0T, SerialNo=
Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=0kB, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2
UDMA modes: udma0 udma1 udma2
AdvancedPM=no
Drive conforms to: device does not report version:
* signifies the current active mode
Have anyone different configuration? How fast can you read cds?
The manpage of hdparm says about the switch -X: you'll need to prepare
the chipset for UltraDMA before setting dma mode. How to prepare the
chipset? Is this necessary?
Wheter or not I run hdparm -X udma2 /dev/cdrom, I see the above
configuration.
While we talk about hdparm: How to disable the write cache of the disk?
-W0 doesn't work.
Jörg.
--
Der Wille, und nicht die Gabe macht den Geber.
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