From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [Qemu-devel] [PATCH 1/5] scsi-disk: removable hard disks support START/STOP Date: Mon, 23 Jul 2012 18:50:19 +0200 Message-ID: <500D80CB.80601@redhat.com> References: <1342448756-7582-1-git-send-email-pbonzini@redhat.com> <1342448756-7582-2-git-send-email-pbonzini@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org To: Blue Swirl Return-path: Received: from mx1.redhat.com ([209.132.183.28]:31591 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754429Ab2GWQuY (ORCPT ); Mon, 23 Jul 2012 12:50:24 -0400 In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: Il 23/07/2012 18:44, Blue Swirl ha scritto: >> > Support for START/STOP UNIT right now is limited to CD-ROMs. This is wrong, >> > since removable hard disks (in the real world: SD card readers) also support >> > it in pretty much the same way. > I remember vaguely tuning a set of large SCSI hard disks > (non-removable) so that they all didn't start immediately at the same > time (which could have burned out the PSU) but only with START UNIT > command. I think Linux or maybe even the BIOS started the drives > (nicely in sequence) before accessing the drive. Yes, all disks do start/stop. Removable disks support load and eject in addition. I'll fix the commit message. Paolo