Mailinglist Archive: opensuse (2859 mails)

["Carlos E. R." <robin.listas@xxxxxxxxxxxxxx>]

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Hi,

I burnt a dvd (non iso) using this command line:

  growisofs -Z /dev/hdc=image

Then, I compared the result:

  cmp /dev/hdc image

and got this:

  cmp: EOF on /Grande/imgs/image

Thus, to check whether everything was saved, I extracted the image from the 
dvd:

  nimrodel:/Grande/imgs # dd if=/dev/hdc of=dvd
  9179712+0 records in
  9179712+0 records out
  4700012544 bytes (4.7 GB) copied, 392.888 s, 12.0 MB/s

and compared the sizes:

  4700000000  image
  4700012544  dvd

Ie, the dvd image extracted from the dvd is slightly bigger. I assume this 
must be some kind of end of track adjustment, but it means that the 
compare fails.

I think I can compare doing this instead:

  nimrodel:/Grande/imgs # cmp --bytes=4700000000  image /dev/hdc

and they match.

I can extract the extra bytes:

  nimrodel:/Grande/imgs # dd if=dvd of=extra skip=4700 ibs=1MB
  0+1 records in
  24+1 records out
  12544 bytes (13 kB) copied, 0.0236522 s, 530 kB/s

and it is all zeroes.



Am I correct, is this to be expected, or am I doing something wrong?


- -- 
Cheers,
       Carlos Robinson

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