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From: gary@ke4zv.UUCP (Gary Coffman)
Newsgroups: comp.unix.sysv386
Subject: Re: Can't access DOS driver c: on ESIX 5.3.2.D using SCSI Drive.
Keywords: ESIX, SCSI, DOS driver access.
Message-ID: <2608@ke4zv.UUCP>
Date: 27 Mar 91 11:37:54 GMT
References: <1991Mar23.080102.3842@netcom.COM>
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Gannett Technologies Group
Lines: 18

In article <1991Mar23.080102.3842@netcom.COM: jypeng@netcom.COM (Jian Yuan Peng) writes:
:
:	I just installed a SCSI(MC1588) 668MB Micropolis drive with AD1542B
:card on PC 386 box. The hardware configuration on CMOS was set to 
:NOT INSTALL.(AD1542B will get it.) I installed DOS4.01 and ESIX 5.3.2.D without
:any problems. Then I found that I can access DOS driver A: and B: using mdir or
:mcopy commands. I got error when I tried to use drive c:. The error message was
:"Unknow physical format or not a DOS disk."  This error can be produced by 
:using driver A: but don't put diskette into driver.  Can any one tell me what
:is wrong?  Thanks!

I'll take a stab at this since no one else has replied. The problem is
DOS 4.01. When Microsoft moved from DOS 3.3 to DOS 4.0 they changed the
FAT table entries from 12 bits to 16 bits in order to support huge DOS
partitions. The Unix world hasn't caught up with this yet. Go back and
install DOS 3.3 instead and everything will work correctly.

Gary