Date: Wed, 11 Apr 2001 12:40:09 +1200 From: "Juha Saarinen" <juha@saarinen.org> To: "Brandon S. Allbery KF8NH" <allbery@ece.cmu.edu>, "Cyrille Lefevre" <clefevre@poboxes.com> Cc: <freebsd-stable@FreeBSD.ORG> Subject: RE: ATA_ENABLE_ATAPI_DMA gone? Message-ID: <KPECIILENDDLPCNIMLOFEEACCBAA.juha@saarinen.org> In-Reply-To: <236930000.986948860@rushlight.rem.cmu.edu>
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:: As I understand it, ATA disks generally support DMA, and ATAPI devices :: (floppies, tapes, CDROM/CDRW, etc.) generally don't; My understanding is that DMA is more efficient than PIO, so you'll find that newer CD ROM drives (ditto DVD drives) support it, because of the higher transfer rates provided. Slower floppy and tape drives on the other hand can get by with PIO. Don't think it's a device-specific issue, but I could be wrong. -- Juha To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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