From:	"Ilya P. Ryzhenkov" <ILYA AT spy DOT isp DOT nsc DOT ru>
Organization:	ISPh SB RAS
To:	djgpp AT delorie DOT com
Date:	Thu, 24 Oct 1996 09:46:16 GMT+0600
Subject:	Re: Drive Help
Message-ID:	<E2E5A7196@spy.isp.nsc.ru>

RI> Date sent:      Wed, 23 Oct 1996 10:09:22 +0200 (IST)
RI> From:           Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>

RI> To that I replied, that if there is C:, then DOS always thinks
RI> that A: and B: are there, because it allocates the block devices in a
RI> linear consecutive array of structures.  So if there is C:, you don't need
RI> to do anything to check if A: and B: are known to DOS; they always are. 
RI> Your case just confirms what I thought. 

 IMHO that's not always as you've written. Consider using SUBST and
 network drive mapping. If I boot from a floppy (on a diskless 
 station) and connect to a network file server (like Novell) and
 issue MAP ROOT C:=SERVER\SYS:\SOMEDIR  then I'll not have B:, however
 A: & C: will be present. There is also other soft which creates it's
 own drives regardles of what is actually present on a machine and in
 DOS mind ;-) (Examples : mscdex, norton utilities diskreet, 
 ramdisk...)
 
======================================================================
Institute of Semiconductors Physics                Ilya P. Ryzhenkov 
Russian Academy of Sciencies             e-mail: ilya AT spy DOT isp DOT nsc DOT ru
Siberian Branch                          http://spy.isp.nsc.ru

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