Date: Wed, 2 Feb 2011 21:21:59 +0100 From: Alexey Shuvaev <shuvaev@physik.uni-wuerzburg.de> To: Alexander Best <arundel@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: looking for a fast way to dump a dvd to a file on my hdd Message-ID: <20110202202159.GA73186@lexx.ifp.tuwien.ac.at> In-Reply-To: <20110202195441.GA39963@freebsd.org> References: <20110202195441.GA39963@freebsd.org>
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On Wed, Feb 02, 2011 at 07:54:41PM +0000, Alexander Best wrote: > hi there, > > i'd like to copy several dvds to my hdd. however my attempts so far haven't > really been that successfull. basically using dd(1) is just way too slow. > > this is my dvd drive: > > cd0 at ata2 bus 0 scbus2 target 0 lun 0 > cd0: <HL-DT-ST DVDRAM GSA-H10N JL12> Removable CD-ROM SCSI-0 device > cd0: 33.300MB/s transfers (UDMA2, ATAPI 12bytes, PIO 65534bytes) > cd0: cd present [342970 x 2048 byte records] > > being connected to > > ata2: <ATA channel 0> on atapci0 > atapci0: <JMicron JMB363 UDMA133 controller> port 0xd000-0xd007,0xd100-0xd103,0xd200-0xd207,0xd300-0xd303,0xd400-0xd40f irq 16 at device 0.1 on pci3 > > please not that this is an atapi drive, but i'm using ATA_CAM. > > so far dd(1) with a bs=2048 finished after: > Try using larger bs, for example bs=1m > 4676648960 bytes transferred in 1639.108763 secs (2853166 bytes/sec) > > ... this drive is capable of reading dvds at a speed of 16x. [1] tells me, > that this means the entire disc (SL) should have been read after ~ 4 minutes. > > please also note that hw.ata.atapi_dma = 1. any suggestions how i can speed up > the process? might switching back to the ata(4) subsystem increase the speed? > > i'm running HEAD (r218104) on the amd64 architecture. > > cheers. > alex > > [1] http://en.wikipedia.org/wiki/DVD#Technology >
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