RE: brand-new DVD drives less reliable than crappy old player - fix?
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Steve Franks Sent: Thursday, February 07, 2008 10:55 AM To: User Questions Subject: brand-new DVD drives less reliable than crappy old player - fix? I have a bunch of disks that will play fine in my laptop and TV, but not in my freebsd system with a new-ish NEC drive. Figured it was the drive, so I got a new pioneer, same issue - scratch somewhere that causes no hiccup on other players makes it tank. I can't even cp or rsync data off them, and these are only minor scratches. Is there anything tunable, or ways to keep rsync or cp going after an error? I get 100MB of the last GB file. Most annoying. I know you usually want cp to fail if there's read errors, but this is one instance where you'd like it to skip and keep going - I assume that's what my dvd player does. These are not commercial disks, so I can't just go out and buy a new one, and I was too stupid to make backups, so I have a vested interest in a workaround. The newer drives turn the disk faster, so of course there is less time the laser light is shining on the spot where the data is, and if a scratch has damaged that spot then optically the bit is not fully 1 way or fully the other, so the voltage out from the laser's eye is going to be closer to the undefined range. What is coming out of the laser's eye is effectively a dirty square wave. I think the developers of the faster drives decided to reduce the sampling window that they look for a logic high or a logic low, so they can sample the bit closer to the center of the high or low, and also since the sample time is lower, they make the circuit less tolerant of bits that are a little less high or a little less low coming out of the laser's eye. Ted ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: brand-new DVD drives less reliable than crappy old player - fix?
On Feb 7, 2008, at 10:54 AM, Steve Franks wrote: I have a bunch of disks that will play fine in my laptop and TV, but not in my freebsd system with a new-ish NEC drive. Figured it was the drive, so I got a new pioneer, same issue - scratch somewhere that causes no hiccup on other players makes it tank. I can't even cp or rsync data off them, and these are only minor scratches. Is there anything tunable, or ways to keep rsync or cp going after an error? Maybe try using dd conv=noerror to get a copy onto a hard drive or another disk? -- -Chuck ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: brand-new DVD drives less reliable than crappy old player - fix?
Can I then mount the bin file as if it was the dvd, or how do I retrieve the actual filesystem at that point? Thanks, Steve On Feb 7, 2008 11:59 AM, Chuck Swiger [EMAIL PROTECTED] wrote: On Feb 7, 2008, at 10:54 AM, Steve Franks wrote: I have a bunch of disks that will play fine in my laptop and TV, but not in my freebsd system with a new-ish NEC drive. Figured it was the drive, so I got a new pioneer, same issue - scratch somewhere that causes no hiccup on other players makes it tank. I can't even cp or rsync data off them, and these are only minor scratches. Is there anything tunable, or ways to keep rsync or cp going after an error? Maybe try using dd conv=noerror to get a copy onto a hard drive or another disk? -- -Chuck -- Steve Franks, KE7BTE Staff Engineer La Palma Devices, LLC http://www.lapalmadevices.com (520) 312-0089 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: brand-new DVD drives less reliable than crappy old player - fix?
Steve Franks wrote: I have a bunch of disks that will play fine in my laptop and TV, but not in my freebsd system with a new-ish NEC drive. Figured it was the drive, so I got a new pioneer, same issue - scratch somewhere that causes no hiccup on other players makes it tank. I can't even cp or rsync data off them, and these are only minor scratches. Is there anything tunable, or ways to keep rsync or cp going after an error? I get 100MB of the last GB file. Most annoying. I know you usually want cp to fail if there's read errors, but this is one instance where you'd like it to skip and keep going - I assume that's what my dvd player does. These are not commercial disks, so I can't just go out and buy a new one, and I was too stupid to make backups, so I have a vested interest in a workaround. Thanks, Steve ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] It could still be hardware. I had similar symptoms with a recent new laptop. I had the DVD writer replaced under warranty with the same model and the engineer commented that it was a not uncommon problem, usually fixed by swapping the hardware. Chris ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: brand-new DVD drives less reliable than crappy old player - fix?
On Feb 7, 2008, at 11:03 AM, Steve Franks wrote: Can I then mount the bin file as if it was the dvd, or how do I retrieve the actual filesystem at that point? Yes, something like: mdconfig -a -t vnode -f _file.bin_ -u 1 mount -t cd9660 /dev/md1 /mnt/cdrom -- -Chuck ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
