[Bug 410085] [NEW] should not read image file just for checksum

[David Balažic]

Public bug reported:

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

** Affects: brasero (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386

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should not read image file just for checksum
https://bugs.launchpad.net/bugs/410085
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