From owner-freebsd-questions@freebsd.org Thu Mar 16 19:56:14 2017 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 3C59BD0F820 for ; Thu, 16 Mar 2017 19:56:14 +0000 (UTC) (envelope-from galtsev@kicp.uchicago.edu) Received: from cosmo.uchicago.edu (cosmo.uchicago.edu [128.135.20.71]) by mx1.freebsd.org (Postfix) with ESMTP id 1D51413C9 for ; Thu, 16 Mar 2017 19:56:13 +0000 (UTC) (envelope-from galtsev@kicp.uchicago.edu) Received: by cosmo.uchicago.edu (Postfix, from userid 48) id 1CF2ECB8CA1; Thu, 16 Mar 2017 14:56:07 -0500 (CDT) Received: from 128.135.52.6 (SquirrelMail authenticated user valeri) by cosmo.uchicago.edu with HTTP; Thu, 16 Mar 2017 14:56:07 -0500 (CDT) Message-ID: <33953.128.135.52.6.1489694167.squirrel@cosmo.uchicago.edu> In-Reply-To: <20170316194612.GA1748@c720-r314251> References: <20170316194612.GA1748@c720-r314251> Date: Thu, 16 Mar 2017 14:56:07 -0500 (CDT) Subject: Re: bootable ext. USB SSD for backup From: "Valeri Galtsev" To: "Matthias Apitz" , freebsd-questions@freebsd.org Reply-To: galtsev@kicp.uchicago.edu User-Agent: SquirrelMail/1.4.8-5.el5.centos.7 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Mar 2017 19:56:14 -0000 On Thu, March 16, 2017 2:46 pm, Matthias Apitz wrote: > > Hello, > > I have acquired a small and flat USB 3.0 external disk (must be SSD for > the size of the case): > > Mar 16 19:36:54 c720-r314251 kernel: da0: > Fixed Direct Access SPC-4 SCSI device > Mar 16 19:36:54 c720-r314251 kernel: da0: Serial Number 20170114010787F > Mar 16 19:36:54 c720-r314251 kernel: da0: 40.000MB/s transfers > Mar 16 19:36:54 c720-r314251 kernel: da0: 953869MB (1953525164 512 byte > sectors) > Mar 16 19:36:54 c720-r314251 kernel: da0: quirks=0x2 > > Ofc it has not the promised 1 TB volume, just only 953869 MB, i.e. only > 1 Marketing-TB; It may have to do with counting by power of 10 instead of power of 2 (Not exactly correct, but close). Which remind me an old joke: Do you know the difference between junior programmer and senior programmer? Junior programmer faithfully thinks that one kilobyte is exactly 1000 bytes. Senior programmer faithfully thinks that one kilogram is exactly 1024 grams. Valeri > > I'm thinking in re-partitioning the disk (which is actual only one big > NTFS slice) with gpart(8), install even a kernel into a small FS at the > beginning and keep the rest as a big UFS for backups. Having it bootable > with a system could be handy if one has to rescue a system and restore > the last dunp. > > Any ideas/comments > > matthias > -- > Matthias Apitz, ✉ guru@unixarea.de, ⌂ http://www.unixarea.de/ ☎ > +49-176-38902045 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++