A week ago I was posted a message when struggling trying to copy my
own DVD with:
dd if=/dev/dvd of=backup.iso  or
cat /dev/dvd >backup.iso

After following several leads from Gentoo folks (including replacing DVD
cable) I've narrow it down to problem with "dma" resetting itself on
"eject". 

When I boot the computer (amd64) the DVD DMA is "ON" 
[quote]using_dma = 1 (on) 

At this point I can make as many copies as I want using commands "dd" or
"cat" but I can not issue eject command 
eject /dev/hdc

As soon as I eject the CD (and reinsert it) the status of DMA is
changing on the DVD 
using_dma = 0 (off) 
And at this point make no difference if I change that status back to
"ON" or not every subsequent DVD copy fails.

I've run onto few posting on Google regarding DMA resetting itself but
no solution.
-- 
#Joseph
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