Will Honea wrote in a message to Roy J. Tellason:
 WH> Roy J. Tellason wrote to Will Honea on 04-22-1998
RT> LG> Also, do NOT enable LBA in the bios. OS/2 will handle the disk 
RT>  LG> mapping arrangements once the drivers load, but the boot tracks 
RT>  LG> and such need to be in a partition in the first 1024 cylinders 
RT>  LG> for -any- operating system to load.
RT> 
RT> Or am I missing something here?
 WH> Somebody sure is!  The only part LG got right was the part 
 WH> about 1024 cylinders - but even there you need to realize that 
 WH> it 1024 LOGICAL cylinders.  From experience, the BIOS mapping 
 WH> (which is what BootManager uses to FIND the boot code for 
 WH> whatever partition your gonna boot) has to macth the mapping 
 WH> which OS/2 sees when it takes over from int13. You gotta be 
 WH> REALLY good to figure any way to swap maps in mid-stream!  
 WH> Regardless of whether you use LARGE, LBA, or NORMAL mapping, 
 WH> OS/2 has to see the same, period.  
I believe that those three are the options my BIOS offers here,  though I 
can't check without rebooting and getting in there...
 WH> FYI, I was unable to get BootManager to work with anything but 
 WH> the first (C:) partition without some form of mapping in BIOS, 
 WH> even if OS/2 was happy to use the disk once you got booted - 
 WH> which I couldn't do from that disk.
I guess this is of some concern if I'm going to reserve a little space for a 
maintenance partition.  I was going to put it at the end,  but now I'm 
starting to think that might not be such a hot idea.  Any thoughts as to how 
big that oughta be,  while I'm at it?
RT>  WH> make a note of the 'cyl/hd/sec' numbers it gives.  Older Bios's 
RT>  WH> had some funny notions about what LBA was! 
RT> 
RT> What would you call "older" in this context?  FWIW I have an 
RT> Award BIOS here with a date of 1/17/96.
 WH> That's reasonably recent.  I have several around from '93 on up 
 WH> and there must be 4 or 5 different mappings, depending on the 
 WH> release date (and OEM).
I know that the one in that 386 in the other room is a few years older,  
though I forget the date on that one offhand.  But then that's only got a 
540M drive in it...
email: roy.j.tellason%tanstaaf@frackit.com 
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