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. Message was sent through the cbm-hackers mailing list
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