X-Authentication-Warning: delorie.com: mail set sender to djgpp-bounces using -f From: Rugxulo Newsgroups: comp.os.msdos.djgpp Subject: Re: strange problem with disk operations Date: Mon, 29 Jun 2009 22:09:04 -0700 (PDT) Organization: http://groups.google.com Lines: 51 Message-ID: <1b68c995-7908-49ec-ad84-6a4a388f083e@i6g2000yqj.googlegroups.com> References: <86e53db7-9815-42a4-a7bc-bcf5276da9a4 AT p18g2000pra DOT googlegroups DOT com> NNTP-Posting-Host: 65.13.115.246 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1246338544 21505 127.0.0.1 (30 Jun 2009 05:09:04 GMT) X-Complaints-To: groups-abuse AT google DOT com NNTP-Posting-Date: Tue, 30 Jun 2009 05:09:04 +0000 (UTC) Complaints-To: groups-abuse AT google DOT com Injection-Info: i6g2000yqj.googlegroups.com; posting-host=65.13.115.246; posting-account=p5rsXQoAAAB8KPnVlgg9E_vlm2dvVhfO User-Agent: G2/1.0 X-HTTP-UserAgent: Opera/9.64 (Windows NT 6.0; U; en) Presto/2.1.1,gzip(gfe),gzip(gfe) To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Reply-To: djgpp AT delorie DOT com Alright, I'm just a lowly hobbyist, so take all these comments with a grain of salt, On Jun 26, 4:49=A0am, paravashu wrote: > i m facing a strange problem with disk reads and writes through > __dpmi_int API. DJGPP 2.03p2 or 2.04? > I am trying to perform DISK reads/writes from USB (which is also a dos > bootable). What brand and size and version of USB, and what version/vendor of DOS? What motherboard, BIOS version? What else is loaded (TSRs, device drivers)? What DOS shell and version? > but the programs always hangs at a particular LBA value. LBA ... doesn't only Win95 OSR2.5 support LBA? (I forget exactly, someone around here knows though.) I assume FAT16, but maybe you're using FAT32? DJGPP 2.04 might help (just blindly guessing). > very weird behaviour..some times load error..comes...some other times > no swap file error comes... some times crashes...:-) No swap file error occurs if you have no FAT partition defined as a C: \ drive. You could (and probably should) disable, or at least redirect via -s, the swapfile. Make sure to try the various CWSDPMI bigstack variants and/or the 2008 refresh. Also try HDPMI32 and/or PMODE/DJ. If I were you, I'd unload any DOS caches (the ones I tried when building Emacs recently gave me lots of trouble), unnecessary TSRs, unnecessary device drivers, etc. Exact error messages would be nice (take a picture with your digital camera or transcribe to paper by hand). > But with the same setup , ghost works perfectly without any error. > the same setup n environment on a different machine works perfectly > without any error with our application. Doesn't matter, lots of machines act differently, even if it's not a BIOS bug. Too many things can go wrong. (Maybe the USB disk is getting old, bad sectors??) > The problem is obvserved when we run the application from USB. please > clarify as to why this is happening... > just not able to find the cause of the problem at 11th time when we > issue the __dpmi_int(0x13,®s); interrupt. Well, I (very ignorantly) imagine that overwriting the swapfile would be bad, or even overwriting parts of the DOS shell or other utility reread from disk on occasion. I dunno. :-( Just proposing a bunch of things to take a closer look at.