ISO9660 4GB directory structures boundary limit and growisofs

Paul B Mahol onemda at
Mon Apr 19 12:48:48 UTC 2010

On 4/17/10, Paul B Mahol <onemda at> wrote:
> 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.

Update: Linux shows all sessions and Windows 7 shows only first one.

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