DVD±R sector size?

Anybody know what the size of a sector on a recordable DVD is, and what sort
of error correction it has in it (ie how a CD's sector is 2352 bytes, 2048
user).

I'm trying to burn some AVI files to DVD, and some work but others dont,
they get CRC errors. I've wasted a DVD-R and a DVD+R on this little
project. Its bizarre, too, as it is unscratched, since I'm reading it right
after writing it.

I had written the disc, then in Nero chose to do an Image Record to write
out an ISO. I used DVDInfoPro to compare the one I had made to the ISO, and
the only differences noted where the first few sectors. I figured it was
because I didnt write it from the ISO file, but did find it rather odd that
there would be differences. This was with the DVD+R disc. The DVD-R disc
wouldn't read past the first 1.2GB without incredible errors. I let it go
overnight, and 9 hours later it had been able to get past the errors after
about 300mb, so then it ran okay from 1.5gb, until it hit another barrier at
about 2.3gb, and it lasted several hundred megs and was still working in the
morning, so I figured I should give up....

Anonymous Joe