From owner-freebsd-questions@FreeBSD.ORG Tue Dec 3 07:09:19 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id CE02B220 for ; Tue, 3 Dec 2013 07:09:19 +0000 (UTC) Received: from nm18.access.bullet.mail.bf1.yahoo.com (nm18.access.bullet.mail.bf1.yahoo.com [216.109.114.41]) by mx1.freebsd.org (Postfix) with SMTP id 70E671A5B for ; Tue, 3 Dec 2013 07:09:19 +0000 (UTC) Received: from [66.196.81.160] by nm18.access.bullet.mail.bf1.yahoo.com with NNFMP; 03 Dec 2013 07:07:18 -0000 Received: from [98.139.221.159] by tm6.access.bullet.mail.bf1.yahoo.com with NNFMP; 03 Dec 2013 07:07:18 -0000 Received: from [127.0.0.1] by smtp119.sbc.mail.bf1.yahoo.com with NNFMP; 03 Dec 2013 07:07:18 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bellsouth.net; s=s1024; t=1386054438; bh=Gj5kjeqqZSGr+WLNCNfFVvVGs2btJt1hM4VPnQmhQSc=; h=X-Yahoo-Newman-Id:Message-ID:Date:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:X-Rocket-Received:From:To:Subject:References; b=sbC9CY8UJikGvXXqsh6UdHkfyCze+9o9jfglyvrg0VZ2zJ/t4bA2j+ZiHxOLJIBYaagP1ydNru1ekM4wM3nKaHSqHFum/qpFGIxW5fjYd7EMHMDP4wMVLJ3IzBCKHalqjBBju1dT4skp5rP13QB1Qu1M9XbBqUy0bBP/ngpbsoI= X-Yahoo-Newman-Id: 251695.62121.bm@smtp119.sbc.mail.bf1.yahoo.com Message-ID: <251695.62121.bm@smtp119.sbc.mail.bf1.yahoo.com> Date: Tue, 3 Dec 2013 07:07:18 +0000 (UTC) X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: iOf0MNoVM1kAmi0Zq79ye_ME7n5.SD9EHOHzAgkz_iHZE_w cCeeD8vMlNhghjLqbo0MfKfq4WBBLwmbQ3L8AxziYzDgeUoOHOwdviRZuF.X idIYNfWgOTO98Jhe2jSqicP21i9yeg90HAqnEE370ZkI5HrfZrtNkIkN2Apx PhbmslJ3v7FKC3BYh0v.r9vuixJ_aN4LUgdiJd_ZHpbEhz54OdCduU5YOJxP HCPUKZ.23vpiG.q9D6vkZR69VAAGNbD1XxEF1H1H54ZTyn_cGi17TI9OO.Im T8Q0RuC9Au.cuuvQIkN3ddnaT4x.9LrJcCflmenFlhf6o_AUZZhwmxUWtEca M_UFxpQ8QWot0LrZ9.sUqnHIg6rb4SD0GB_SOaKtHx_BleqE9j1xC1cAJ1lU yq9Kw2xCOU0cyP3FuyWKIvAWSKAB1za2vuepbSaccbX3ixWJ.F9FY3xvmGWy CVPMc3ghLEt2n7v4cA88QkRxBsAzK8oB9AqWzN_cHWjS03FUnS0hYrl8sAQE zQiZQ27HbYe8jxAw9CzSK9bxxnzvp73rB6gOnBNEp2Dl.wkCWGGj06suZv3O 1R.HZyUhVTavdNnH19v_6sTt2ntXKlJYhoKyh...9Cwn1BN1ln80cFHaXSMt G9nt44C28W1k7pDEz0vgqqPBm_NxI8aYRwiPpL3iBfd2P.IA- X-Yahoo-SMTP: Kz_aW1.swBBYof3zAD7.RWzXz9ZAQVDMml1VADsbgPT4Kq79LC0- X-Rocket-Received: from localhost (mueller6724@96.28.178.143 with ) by smtp119.sbc.mail.bf1.yahoo.com with SMTP; 03 Dec 2013 07:07:18 +0000 UTC From: "Thomas Mueller" To: freebsd-questions@FreeBSD.org Subject: Re: gmirror, gpart and MBR vs GPT in the Handbook References: <201311301303210813.05DE187E@smtp.24cl.home> <201312011121580096.005D00FB@smtp.24cl.home> <201312021213320528.00673D5F@smtp.24cl.home> X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Dec 2013 07:09:20 -0000 from Warren Block: > As far as I recall, MBR expects 512-byte blocks and uses 32-bit > values. The total number works out to 2TB (2^32*512). > Just recently, someone in the forums had an external drive, MBR > format, but 4K blocks. There were problems, although I don't know if > FreeBSD was at fault. > I have not tried MBR on a drive larger than 2TB. I suspect it would > be safe to use the first 2TB and ignore the rest, but that really > ought to be verified. There are ways (kludges) to get MBR on a drive > 2TB. Western Digital My Book 3TB USB 3.0 hard drive was formatted with a single huge NTFS partition with some software. In order to copy the stuff, which I've never used, I had to use the System Rescue CD. Subsequently I migrated to GPT, deleted the huge partition, and made my own GPT partitions. OpenBSD has a kludge with fdisk + disklabel whereby everything over 2TB goes into one (or more) disklabel partitions, but boot partition must be entirely within first 2TB. I never tried that and don't plan to. fdisk can't see the slice that goes past 2TB, but OpenBSD can, according to what I read on OpenBSD online documentation. I never tried that. OpenBSD can't access my hard drive at all for lack of support for USB 3.0 and GPT. DragonFlyBSD latest release, 3.6.0, downloaded, bzip2 -d and dd'ed to USB sticks recognizes my hard drive partitions but can't mount any. So all I can do with OpenBSD is download the Live USB from liveusb-openbsd.sourceforge.net, run 7z e on the download, which is 7-zipped. 7-zip (archivers/p7zip) is in FreeBSD ports, which is how I built it. NetBSD supports GPT, but the dk wedges are not as elegant as what FreeBSD and Linux do. NetBSD seems to be just starting with USB 3.0 support in -current. NetBSD and OpenBSD still use preassigned device nodes with MAKEDEV such as Linux and FreeBSD had some years back. This is actually sort of a combined response to two threads, other one being Re: kernel "mismatch" on r256420. Tom