On Sat, 13 May 2006 19:19:30 +0300 (EEST) Dmitry Pryanishnikov <dmitry_at_atlantis.dp.ua> wrote: > > Hello! > > On Sat, 13 May 2006, Angka H. K. wrote: > > By the way what is WDMA and why it saying PIO not WDMA ? > > WDMA corresponds to so-called "multiword DMA" transfer mode. It's slower than > UDMA (IIRC WDMA2 gives 16Mbytes/s, same as PIO4), but still should be > sufficient for CD/DVD drive (well, up to 8x-speed DVDs). Of course, it's > better to use WDMA2 than PIO4 because WDMA (as well as UDMA) doesn't use > CPU cycles for moving data between RAM and device. FreeBSD's ata driver > is quite conservative, and doesn't automatically enable WDMA mode for > ATAPI device even if hw.ata.atapi_dma=1, so you should just enable > this mode with atacontrol. E.g., you can add Does this mean I should set my laptop's drive mode to WDMA2 instead of UDMA100 (HD) and UDMA33 (CDRW)? Marcin.Received on Sat May 13 2006 - 16:37:57 UTC
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