Re: X-IDE and Power Cartridge

From: Jim Brain (
Date: 2007-12-28 01:43:13 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).  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.  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.

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. 

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.


Jim Brain, Brain Innovations                                      (X) 
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! 

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