From owner-freebsd-questions@freebsd.org Thu Oct 15 13:36:07 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 2BEBF43EF3D for ; Thu, 15 Oct 2020 13:36:07 +0000 (UTC) (envelope-from 4250.82.1d4c5000396c3ac.03e92704a2df49d9b32690f416336fa3@email-od.com) Received: from s1-b0c6.socketlabs.email-od.com (s1-b0c6.socketlabs.email-od.com [142.0.176.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4CBr061VRkz4VMt for ; Thu, 15 Oct 2020 13:36:05 +0000 (UTC) (envelope-from 4250.82.1d4c5000396c3ac.03e92704a2df49d9b32690f416336fa3@email-od.com) DKIM-Signature: v=1; a=rsa-sha256; d=email-od.com;i=@email-od.com;s=dkim; c=relaxed/relaxed; q=dns/txt; t=1602768965; x=1605360965; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to:message-id:subject:to:from:date:x-thread-info; bh=yN7aU3lT9wdW8/xMpJpbg4CvmEIVI+bVvQj3pPf7tQo=; b=TT3aMF8yh8Yr0XdyHzqI2+UEyCLXVQmCpScDdziHQdvhSLQqEMT2yULU1IfsHkdzxvnNXxlfDFzGDu2AAwkJIlzeJ0Qz4TcKkPmCAL+zUOjXCTCArwWHCN+GDvR/b5Cq3EI7z0+L1BEPNO4URJqdVktol0TUaGcRBN4Zn92WsUU= X-Thread-Info: NDI1MC45Mi4xZDRjNTAwMDM5NmMzYWMuZnJlZWJzZC1xdWVzdGlvbnM9ZnJlZWJzZC5vcmc= Received: from r2.h.in.socketlabs.com (r2.h.in.socketlabs.com [142.0.180.12]) by mxsg2.email-od.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Thu, 15 Oct 2020 09:35:54 -0400 Received: from smtp.lan.sohara.org (EMTPY [185.202.17.215]) by r2.h.in.socketlabs.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Thu, 15 Oct 2020 09:35:56 -0400 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.94 (FreeBSD)) (envelope-from ) id 1kT3QA-000BRO-Gu for freebsd-questions@freebsd.org; Thu, 15 Oct 2020 14:35:54 +0100 Date: Thu, 15 Oct 2020 14:35:54 +0100 From: Steve O'Hara-Smith To: freebsd-questions@freebsd.org Subject: Re: A couple of questions about SSDs Message-Id: <20201015143554.c82cd365eb4ae5dbd967793c@sohara.org> In-Reply-To: <20201015084311.5fa2156c@archlinux> References: <20201014121442.662e71c4@archlinux> <20201014174749.6df7572a.freebsd@edvax.de> <20201014202206.7c7886d0@archlinux> <20201015060615.GJ22063@mithril> <20201015084311.5fa2156c@archlinux> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; amd64-portbld-freebsd12.0) X-Clacks-Overhead: "GNU Terry Pratchett" Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4CBr061VRkz4VMt X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=email-od.com header.s=dkim header.b=TT3aMF8y; dmarc=none; spf=pass (mx1.freebsd.org: domain of 4250.82.1d4c5000396c3ac.03e92704a2df49d9b32690f416336fa3@email-od.com designates 142.0.176.198 as permitted sender) smtp.mailfrom=4250.82.1d4c5000396c3ac.03e92704a2df49d9b32690f416336fa3@email-od.com X-Spamd-Result: default: False [-1.68 / 15.00]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[email-od.com:s=dkim]; NEURAL_HAM_MEDIUM(-0.96)[-0.962]; FROM_HAS_DN(0.00)[]; RWL_MAILSPIKE_GOOD(0.00)[142.0.176.198:from]; MV_CASE(0.50)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[sohara.org]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.002]; RCVD_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+ip4:142.0.176.0/20]; DKIM_TRACE(0.00)[email-od.com:+]; NEURAL_HAM_SHORT(-0.02)[-0.017]; RCVD_IN_DNSWL_NONE(0.00)[142.0.176.198:from]; FORGED_SENDER(0.30)[steve@sohara.org,4250.82.1d4c5000396c3ac.03e92704a2df49d9b32690f416336fa3@email-od.com]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:7381, ipnet:142.0.176.0/22, country:US]; FROM_NEQ_ENVFROM(0.00)[steve@sohara.org,4250.82.1d4c5000396c3ac.03e92704a2df49d9b32690f416336fa3@email-od.com]; MAILMAN_DEST(0.00)[freebsd-questions] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Oct 2020 13:36:07 -0000 On Thu, 15 Oct 2020 08:43:10 +0200 Ralf Mardorf wrote: > Maybe HDD are more fragile than SSD. Of course they are, hard discs are complex mechanical systems operating at ludicrous precision. The astonishing thing is that they're as robust as they are. The first PC hard disc I ever saw (and helped install in a Torch prototype) was a 5Mb drive in full height 5 1/4" format - it came in a large wooden box and was suspended in the middle by a set of springs to the corners. The mounting instructions were long and full of dire warnings. Modern hard discs can be thrown and caught (dropping is inadvisable) which I find impressive. SSDs are ... well solid and won't be bothered by being dropped a few feet. -- Steve O'Hara-Smith