Date: Tue, 3 Oct 2000 02:52:51 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: grog@lemis.com (Greg Lehey) Cc: tlambert@primenet.com (Terry Lambert), freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: Partitioning (was: ccd with other filesystems) Message-ID: <200010030252.TAA01796@usr06.primenet.com> In-Reply-To: <20001003090846.F372@wantadilla.lemis.com> from "Greg Lehey" at Oct 03, 2000 09:08:46 AM
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> > The PReP specification makes it crystal clear how you can > > support up to 2^32 sectors with the DOS partition table > > mechanism. It's perhaps the best documentation I've ever > > seen for the DOS partition table, and the 32 bit sector > > field. I'd have bought the thing for that documentation > > alone, had I known it was there when I needed it. > > Why do we need it? Compatability? Interoperability? Booting disks on AlphaBIOS, Motorolla PowerStack machines, etc.? To avoid yet another gratuitous difference from the rest of the world? > > PS: That's 112 TB, in LBA mode. > > I make 1 TB for signed sector numbers, which is what we already have. > How do you get 112 TB out of 512*2**31? Sorry, 2TB (it's unsigned). 2^32 * 512 = 2.233383e+11 I guess I clicked again when I shouldn't have in the calculator; my bad. I should have done it in my head, instead; it's easy to say "4 billion over 2 times 1000". Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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