should not read image file just for checksum

[David Balažic]

Binary package hint: brasero

Recently I burned a DVD-R from an ISO image file.
It was very slow.

The reason: brasero reads the input ISO file twice, once for the checksum, then again for the actual burning.

In my case the file was heavily fragmented and the performance was very poor (5 minutes to read the file instead of 1 minute when not fragmented).

The fragmentation is a separate issue, but braseo could be optimized by reading the file only once.
While burning, it could parallelly compute the checksum.

Or if that is hard to implement: Do not use checksum at all, but compare the burned data to the input file. This way in case of verify error, the exact point(s)/sectors(s) of mismatch can be identified.

Frankly, the current way of doing seems the wors possible (except if the checksum is remembered, but reading other bugs suggests that it is not).

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: brasero 2.26.1-0ubuntu1
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: brasero
Uname: Linux 2.6.28-14-generic i686

[David Balažic (xerces8)]

ubuntu-10.10-desktop-i386.iso live env.
GNOME 2.32
brasero 2.32.0-0ubuntu2
nautilus 1:2.32.0-0ubuntu1

Same as before.