silverdr_at_inet.com.pl
Date: 2007-12-28 11:34:20
On 2007-12-28, at 01:43, Jim Brain wrote:
>> P.S. A different subject - I don't know why but it seems to me
>> that nobody likes the idea of (re)using IDE64 partition scheme and
>> filesystem.. I wonder why..?
> We are defitely using the IDE64 Partition Scheme, as it uses the
> std IBM IDE partition scheme.
> If we implement the IDE64 FS, we should absolutely use partition
> type 0xcf (the one they use).
Well - the word "absolutely" doesn't fit IMHO. IDEDOS is still being
developed and I don't think it would be impossible to persuade the
author(s) with reasonable arguments to change what is used there - if
that is needed for some reasons.
> Note, though, there might be issues using 0xcf for other FS-
> types. For one, IDE64 will no doubt assume an 0xcf partition type
> is IDEDOS FS, but if we overload that partition type with other FS
> layouts (like Linux uses 0x83 for multiple FStypes - xiafs, ext2,
> ext3, reiserfs, etc.), and someone tries to share a CF or IDE drive
> between the two adapters, major issues and data lossage will occur.
See above. Also:
a) partition type does not necessarily denote a filesystem in use (as
you noted yourself), and
b) I am not 100% sure that "IDE64 will no doubt assume an xyz
partition is IDEDOS FS" - I'd have to check that but I wouldn't be
surprised if the superblock was checked at least for the FS signature
> The other issue (not nearly as problematic, but still) is that
> 0xcf is already a claimed partition type (0xcf is claimed by DR-DOS
> Secure FAT FS). As far as I can tell, 0xf8 is not used by anyone.
I tend to believe that DR-DOS (since unethically - yet effectively
killed by Mircrosoft) clash is not what concerns most potential users
of the iface in question. Still - see the first paragraph of my reply.
> As for the FS, I think it should be supported, but I don't know
> that it should be the only one supported. I think FAT should be
> supported as well, for folks who want to mount their CF and then
> pick it up and pop it into their PC.
As I wrote - reading FAT is supported in the current IDEDOS. For
effective CBM use there might (?) be limitations preventing it usage
without major workaround/encapsulating effort. How about Microsoft
royalties. I heard (correct if wrong) that one has to pay licence
fees for write support.
> However, beyond the use of IDE partition tables, I can;t find a doc
> that explains the FS layout. Without it, it will be very hard to
> implement.
See previous post.
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