Ubuntu
hdparm package

SAMSUNG CDRW/DVD SN-324F works with DMA activated!

Bug #24504 reported by daller on 2005-10-23

This bug report is a duplicate of: Bug #36185: Automatically enable DMA on CD-ROMs where it is known to work. Edit Remove

Affects		Status	Importance	Assigned to	Milestone
	hdparm (Ubuntu)	Invalid	Medium	Unassigned

Bug Description

This is what I have on my DVD-drive in my laptop:

daniel@dallap:~$ hdparm -i /dev/hdc

/dev/hdc:

Model=SAMSUNG CDRW/DVD SN-324F, FwRev=U203, 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:227,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

* signifies the current active mode

DMA works - but it wasn't activated per default (I consider that a bug)

Revision history for this message

Dennis Kaarsemaker (dennis) wrote on 2005-10-24:

Afaik Ubuntu does not yet enable DMA by default because it is not always safe to
do so. Closing this as NOTABUG since it's a policy issue and not a bug, but
maybe mdz can shed some more light.

Revision history for this message

Matt Zimmerman (mdz) wrote on 2005-10-24:

This bug has been marked as a duplicate of bug 36185.

Revision history for this message

daller (daniel-dallerweb) wrote on 2005-10-24:

(In reply to comment #1)
> Afaik Ubuntu does not yet enable DMA by default because it is not always safe to
> do so. Closing this as NOTABUG since it's a policy issue and not a bug, but
> maybe mdz can shed some more light.

Isn't it always safe with this specific drive? (I mean some are enabled per default, and some aren't)

...I just wanted to tell you guys that my drive works!!!