burncd -- possible problem

[Eduardo Viruena Silva]

On Wed, 14 May 2003, Malcolm Kay wrote:

> I'm not sure whether I have a problem burning CD-Rs -- certainly
> I don't understand what I observe.
>
> The OS is FreeBSD 4.7-release.
>
> I take a commercial CD-ROM and copy it as an image with:
> # cp /dev/acd1c natins.cd
> which creates the file natins.cd of around 673400*1024 bytes
> without any apparent problem. (I can't remember the exact size
> but was certainly a multiple of 1024).
>
> # md5 natins.cd
> and
> # cat /dev/acd1c | md5
> produce identical results.
>
> Now inserting a blank CD-R:
> # burncd -f /dev/acd1c data natins.cd fixate
> runs apparently normally and without error.
>
> But now
> # cat /dev/acd1c | md5
> produces and IO error and a different checksum
>
> # cp /dev/acd1c natins.back
> produces the same IO error and a file 8*1024 bytes
> shorter than natins.cd.
>
> If I strip off the last 8k from natins.cd and compare the
> result with natins.back I find they are the same.
>
> When I look at the last 8*1024 bytes stripped from natins.cd I
> find these are all zero (ie NUL).
>
> Re-running burncd on a new CD-R blank repeats the result
> exactly; i.e. IO error 8k short of the size of the original but the
> rest matching.
>
> As a mounted cd9660 file system the copy appears normal and
> the visible files test identical to those on the original.
>

have you tried dd ?

	dd if=/dev/acd0c of=natins.cd bs=2048



> Questions:
> Is what I'm observing normal when writing with burncd?
> Do I have a hardware problem?
> Is this due to some bug in burncd?
>
> Should I worry about this or just ignore?
>
> Malcolm Kay
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