On Tue, 2008-02-12 at 15:53 +0100, Oliver Fromme wrote: > Tom Evans wrote: > > The chipset supports UDMA6, the drive supports UDMA6, > > Are you sure about that? What brand/model is that? > I don't think I've ever seen an atapi CD/DVD drive > that supported more than UDMA3. > > Best regards > Oliver > I actually made a mistake there; the drive supports 'ATA/ATAPI Revision 6', which is, of course, UDMA5. This is according to atacontrol, and is used when booted up into windows 2000.
I believe UDMA modes will give less resource usage compared to WDMA modes, and combined with a large read-ahead cache in mplayer, should prolong battery life by spinning up less frequently and remaining spinning for less time, therefore I'm going to continue to try and get it to correctly allow my DVD drive to use these modes. As for drives not supporting more than udma3, seems ok on linux. /dev/hda: ATAPI CD-ROM, with removable media Model Number: PIONEER DVD-RW DVR-112 Serial Number: GFDP176727WL Firmware Revision: 1.21 Standards: Likely used CD-ROM ATAPI-1 Configuration: DRQ response: 50us. Packet size: 12 bytes Capabilities: LBA, IORDY(can be disabled) Buffer size: 64.0kB DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=240ns IORDY flow control=120ns
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