ISO9660 4GB directory structures boundary limit and growisofs

Paul B Mahol onemda at
Sat Apr 17 17:12:08 UTC 2010

On Sat, Apr 17, 2010 at 4:31 PM, Tim Kientzle <kientzle at> wrote:
> Paul B Mahol wrote:
>> It is apparently not possible to make use of -use-the-force-luke=4gms
>> on FreeBSD when appending new session after 4GB. Mounted disk
>> afterwards  show nothing.
>> Should we allow it like linux does?
> Are you claiming there is a problem when FreeBSD reads such
> images or a problem with creating such images?  What
> programs are you using?

I burn flac files in multiple sessions, each session have separate
directory, on DVD+R DL MKM/003
After I used 4gms switch mounted fs shows nothing. (but there is >5GB of data)

According to growisofs source BD (bluray) dont need this switch at all ...

> This sounds like a pretty unsurprising 32-bit truncation
> bug:  the filesystem structures in ISO9660 are all sector
> numbers so 8TB should be the natural limit (4G sectors
> times 2k bytes/sector).

I did not tested this on FreeBSD amd64 yet.

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