Hi Michael.
Michael Schmitz - 29.06.18, 11:07:
But it's up to the person (which is not Linux) formatting the disk
to
not try to use
it on systems that cannot handle it, and may destroy it.
Let me clarify: what exactly would the kernel option allow? When
to use it?>>
Whether to use it if safe (on Linux). But whatever Linux does
(after
this patch), access will go to the right area of the disk (as
specified by the RDB) so Linux won't any longer stomp on anything
that would have mattered to 32 bit disk drivers. So it really
should be safe.>
Personally, I see no reason to depend on a kernel option, if it is
safe to use. Just use it.
So to recap - someone partitions a disk on AmigaOS 4.x, taking
advantage of the large block device support there.
Using that disk on AmigaOS 3.1, data loss ensues. Whether or not Linux
(patched) ever touched the disk has no impact on that outcome.
I am not even completely sure about that. Frankly I have no idea what
would happen when using such a disk on AmigaOS 3.1 *without* NSDPatch or
TD64 support (I think you could patch AmigaOS 3.1 with 64 Bit support
already and some 3rd party harddisk controllers by Phase 5 hat TD64
support at that time already). Unless I try it, which I won´t at the
moment, I´d say the behaviour is largely undefined.
But hey, undefined means it may just overwrite start overwriting from
the beginning of the disk beyond 32 bit. And I think that is quite
likely. It could also crash, but if its an overflow I don´t think why it
would crash. Anyway, I never tried this out.
But in any way: This would happen or not happen no matter whether Linux
parsed the RDB or not.
I still think that the native OS warning really does not hurt… but I´d
spare myself the kernel option. Having the warning without the kernel
option would be a compromise between being cautious and being bold :).
Thanks,
--
Martin
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