Article View: a2000.comp.software.os.windows-nt
Article #35Re: floppy drive error
From: Roger Hamlett
Date: Fri, 14 Apr 2000 00:00
Date: Fri, 14 Apr 2000 00:00
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Steve wrote in message ... >Yes........but if this is the case why does it access the floppy before >giving the error? > >"Roger Hamlett" <roger@ttelmah.demon.co.uk> wrote in message >news:955623051.18364.5.nnrp-06.9e988e54@news.demon.co.uk... >> >> Steve wrote in message <_7aJ4.2070$GP3.11890@typhoon.nyroc.rr.com>... >> >Yes will boot to dos. No twist. >> This is your problem. The first floppy, should have the twist. I >> suspect you may have the BIOS set to 'swap A/B' (an option for this >> exists in most BIOS's), so you actually have drive 'B' attached, but >> being seen as 'A' from DOS or W9x. In NT, the drivers ignore the BIOS, >> and are finding no drive A attached... The problem is that it depends on how your drive is attached. The original floppy interface design, had a single 'motor on' select line, and four seperate 'drive select' lines. IBM elected to make the interface more complex, by just supporting two drives, adding a second 'motor select' line, twisting this into the right position on the drive, and leaving the 'drive select' lines all joined. This was fractionally cheaper to build in the control board, but required the cable twist. Different drives respond differently to the control combinations, so if a drive is on the 'untwisted' part of the cable, it is fairly common for it to display the 'select' light, when the select signal is received, and (depending on the make), even step the heads, but no data is returned. This gives exactly your drive symptoms... Best Wishes
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fb9cd,e9360f84c9ac6fdc X-Google-Attributes: gidfb9cd,public X-Google-Thread: 105254,e9360f84c9ac6fdc X-Google-Attributes: gid105254,public X-Google-Thread: 104ed6,e9360f84c9ac6fdc X-Google-Attributes: gid104ed6,public X-Google-Thread: 13baf1,e9360f84c9ac6fdc X-Google-Attributes: gid13baf1,public From: "Roger Hamlett" <roger@ttelmah.demon.co.uk> Subject: Re: floppy drive error Date: 2000/04/14 Message-ID: <955705134.8930.0.nnrp-14.9e988e54@news.demon.co.uk> X-Deja-AN: 611044012 X-NNTP-Posting-Host: ttelmah.demon.co.uk:158.152.142.84 References: <DWRI4.409$GP3.4572@typhoon.nyroc.rr.com> <38f50895.5133020@news.bart.nl> <_7aJ4.2070$GP3.11890@typhoon.nyroc.rr.com> <955623051.18364.5.nnrp-06.9e988e54@news.demon.co.uk> <zErJ4.2398$GP3.18221@typhoon.nyroc.rr.com> X-Trace: news.demon.co.uk 955705134 nnrp-14:8930 NO-IDENT ttelmah.demon.co.uk:158.152.142.84 X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 Newsgroups: a2000.comp.software.os.windows-nt,comp.os.ms-windows.nt.misc,microsoft.public.windowsnt,microsoft.public.windowsnt.misc X-Complaints-To: abuse@demon.net