Date: Sun, 14 Dec 1997 12:38:57 +1030 From: Mike Smith <mike@smith.net.au> To: Terry Lambert <tlambert@primenet.com> Cc: hackers@freebsd.org Subject: Re: blocksize on devfs entries (and related) Message-ID: <199712140208.MAA04740@word.smith.net.au> In-Reply-To: Your message of "Sat, 13 Dec 1997 21:28:25 -0000." <199712132128.OAA02173@usr06.primenet.com>
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> > The problem is that on all new devices the layout is both hidden and > > not easily describable. Nor can we describe the layouts of media that have > > not yet been invented. Track/cyl/sector geometry descriptions can not be > > used to describe modern disks and the picture is muddied by track buffers > > and reverse block write order (for example). > > SCSI I geometries are not directly accessable. But SCSI II geometries > are. Er, in what fashion? I don't recall any mandatory pages for zone description tables, or provision for self-describing geometry pages for new geometry techniques. > I think track buffers and reverse block write order are attributes > that could be communicated (actually, the second implies the first. 8-)). There is no standard for this, however, nor for describing the control policies that are applied to them, all of which relate to the effect that they may have on a consumer. mike
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