Date: Tue, 16 Jan 2007 21:57:39 +0100 From: Wilko Bulte <wb@freebie.xs4all.nl> To: hackers@freebsd.org Subject: DVD-RAM on FreeBSD? Message-ID: <20070116205739.GA4853@freebie.xs4all.nl>
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Today I by coincidence found myself with DVD-RAM disk. Given that my DVD drive ( NEC DVD_RW ND-4571A 1-01 ) should be able to work with DVD-RAM disks my curiosity got the best of me. Currently running FreeBSD freebie.xs4all.nl 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #6: Fri Dec 22 17:16:16 CET 2006 root@freebie.xs4all.nl:/usr/src/sys/i386/compile/FREEBIE i386 Following the handbook's suggestion at http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/creating-dvds.html I tried: -su-2.05b# dd if=/dev/zero of=/dev/acd0 count=2 dd: /dev/acd0: Invalid argument 1+0 records in 0+0 records out 0 bytes transferred in 0.002064 secs (0 bytes/sec) I have tried different blocksizes with dd but that does not help. From: -su-2.05b# dvd+rw-mediainfo /dev/dvd INQUIRY: [_NEC ][DVD_RW ND-4571A ][1-01] GET [CURRENT] CONFIGURATION: Mounted Media: 12h, DVD-RAM Current Write Speed: 6.1x1385=8467KB/s Write Speed #0: 6.1x1385=8467KB/s Write Speed #1: 5.1x1385=7056KB/s Write Speed #2: 4.1x1385=5645KB/s Write Speed #3: 3.1x1385=4234KB/s Write Speed #4: 2.0x1385=2822KB/s Write Speed #5: 1.0x1385=1411KB/s GET [CURRENT] PERFORMANCE: Write Performance: 3.0x1385=4155KB/s@[0 -> 2236704] Speed Descriptor#0: 03/2236704 R@3.0x1385=4155KB/s W@3.0x1385=4155KB/s Speed Descriptor#1: 03/2236704 R@2.0x1385=2770KB/s W@2.0x1385=2770KB/s READ DVD STRUCTURE[#0h]: Media Book Type: 16h, DVD-RAM book [revision 6] Legacy lead-out at: 2314080*2KB=4739235840 READ DISC INFORMATION: Disc status: other Number of Sessions: 1 State of Last Session: complete "Next" Track: 1 Number of Tracks: 1 READ FORMAT CAPACITIES: unformatted: 2295072*2048=4700307456 00h(800): 2236704*2048=4580769792 00h(800): 2295072*2048=4700307456 -su-2.05b# it appears the disk is recognised OK. One can run dvd+rw-format on the disk without problems. I'm probably missing something (but so is the handbook IMO ;-) so suggestions are welcome. Especially from people running DVD-RAM successfully on RELENG_6 thanks, Wilko -- Wilko Bulte wilko@FreeBSD.org
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