Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uwm.edu!lll-winken!elroy.jpl.nasa.gov!jato!mars!kaleb
From: kaleb@mars.jpl.nasa.gov (Kaleb Keithley)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Invalid drive problem
Keywords: HD, OS2
Message-ID: <2645@jato.Jpl.Nasa.Gov>
Date: 23 Jan 90 16:35:59 GMT
References: <1248@kannel.lut.fi>
Sender: news@jato.Jpl.Nasa.Gov
Reply-To: kaleb@mars.UUCP (Kaleb Keithley)
Distribution: comp
Organization: Jet Propulsion Laboratory, Pasadena, CA.
Lines: 20

In article <1248@kannel.lut.fi> villikka@kannel.lut.fi (Juha Villikka) writes:
>
>I have problems with IBM PS/2 model 55 SX using PC-DOS 3.3.
>In the hard disk there is OS/2 1.1 EE. When I start the computer from
>floppy disk with PC-DOS it does not recognize hard disk driver C:
>and D:. When I try to go drive C or D, DOS says: "Invalid drive
>specification".
>
>Why I cannot use hard disk when I start the computer from diskette?

Because OS/2 1.1 uses the 32 bit FAT table, allowing disks up to 16 gigabytes.
DOS 3.3 only knows about 12 and 16 bit FAT tables.  The partition ID byte
is what tells DOS whether the partition has a 12, 16, or 32 bit FAT.  Try
DOS 4.01, or Compaq DOS 3.31, either of those should recognize the 32 bit FAT.


Chewey, get us outta here!
                 
kaleb@mars.jpl.nasa.gov            Jet Propeller Labs
Kaleb Keithley