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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!usc!sol.ctr.columbia.edu!news.columbia.edu!cunixb.cc.columbia.edu!mig
- From: mig@cunixb.cc.columbia.edu (Meir I Green)
- Subject: Re: Can both DOS and OS2 be booted from same HD ?
- Message-ID: <1992Jul30.001207.25529@news.columbia.edu>
- Keywords: boot, partition
- Sender: usenet@news.columbia.edu (The Network News)
- Nntp-Posting-Host: cunixb.cc.columbia.edu
- Reply-To: mig@cunixb.cc.columbia.edu (Meir I Green)
- Organization: Columbia University
- References: <HBPmoB2w165w@comtch.spk.wa.us> <1992Jul29.152502.12190@njitgw.njit.edu>
- Date: Thu, 30 Jul 1992 00:12:07 GMT
- Lines: 33
-
- In article <1992Jul29.152502.12190@njitgw.njit.edu> dic5340@hertz.njit.edu (David Charlap) writes:
- >In article <HBPmoB2w165w@comtch.spk.wa.us> mstaben@comtch.spk.wa.us (Matthew Staben) writes:
- >
- >>As far as I know - you can only use OS/2 to recognise an HPFS partition,
- >>and the only way you'll be able to see all four partitions with both
- >>operating systems is to use the FAT system for all four partitions. If
- >>you find a way to boot DOS (from DOS) and still see the HPFS partitions,
- >>I would be extremely interested in how this was done. It would be
- >>interesting if a device driver was written for DOS to enable HPFS
- >>partitions to be recognised.
- >
- >Well, DOS can read an HPFS partition as raw sectors. You can use
- >Norton Utilities to read them (HPFS shows up as a "Non-DOS"
- >partition).
- >
- >So you should be able to write an application to extract files from
- >HPFS and copy them to a FAT volume. Assuming there is a byte-level
- >description of the HPFS data structures available. You could have a
- >DOS app do all the direct-sector reads to find files and read them.
- >
- >To install HPFS seamlessly in real DOS, though, would probably be
- >prohibitive. I'd expect the driver to use all your real-mode memory
- >for itself, leaving nothing for applications.
-
- Would the entire driver have to be loaded low?
- Why couldn't one write a file manager which switches into protected mode, and
- loads the HFPS module into extended memory? Then you could copy files over to
- FAT, mess with them, and copy them back.
-
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