Date: Mon, 23 Jul 2012 03:10:40 -0700 From: perryh@pluto.rain.com To: bonomi@mail.r-bonomi.com Cc: freebsd-questions@freebsd.org Subject: Re: fsck on FAT32 filesystem? Message-ID: <500d2320.f8bzaFvCSay0b7rK%perryh@pluto.rain.com> In-Reply-To: <201207222012.q6MKCxPe025704@mail.r-bonomi.com> References: <201207222012.q6MKCxPe025704@mail.r-bonomi.com>
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Robert Bonomi <bonomi@mail.r-bonomi.com> wrote: > MSDOS/PCDOS had -no- O/S functions to directly access actual disk > devices. The ONLY fuctionality provided to the user, by the "O/S" > was filesystem based access. To get 'raw' device access, one had > to bypass the O/S entirely, and use direct BIOS calls (INT 13h). FALSE TO FACT. MSDOS/PCDOS had no _documented_ functions to directly access the disks, bypassing the file system, but the functions _did_ exist. The debugger's "read sector" and "write sector" commands used them, and I suspect chkdsk, scandisk, and format probably also used them although I never had occasion to verify one way or the other.
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