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echo: os2prog
to: Jeff Patten
from: Patrick Haller
date: 1996-02-07 13:39:06
subject: DosDevIOCtls

Hi Jeff!

[..]
 JP>    Are you trying to dismount and eject a disk locked by LOCKDRV.FLT? 
Sort of ...
 JP> I would think that's the wrong way to approach the problem -- you
 JP> want to be able to use HPFS without needing LOCKDRV.FLT.    
... you're right. But actually, this is more or less impossible. HPFS is
ONLY supported on type 5 "fixed disk" medias. Furthermore without
LOCKDRV, the Syquest is mounted as "super disk" not as a
partitionable device. And HPFS can only exist on a partitionable device.

 JP> It appears that mounting/dismounting the file system is the easy
part.  After all
 JP> FORMAT does it every time you reformat a drive to a different file
 JP> system.  
Not completely correct. With DosShutdown(1L) is can flush the DATA caches.
But sometimes the CDI-caches (directory structure) remains unflushed. IMHO
FS_UNMOUNT and FS_FLUSH are lacking from the IFS-interface.
     __
     |_)
cu/2 |atrick
[Team  OS/2]

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