From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: Re: Large disk drives Date: Tue, 04 Nov 2014 08:52:42 +0100 Message-ID: <1415087562.2351.3.camel@jarvis.mobile.lan> References: <201411032106.sA3L6MqU026397@hobgoblin.ariadne.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from bedivere.hansenpartnership.com ([66.63.167.143]:35096 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752218AbaKDHwq (ORCPT ); Tue, 4 Nov 2014 02:52:46 -0500 In-Reply-To: <201411032106.sA3L6MqU026397@hobgoblin.ariadne.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "Dale R. Worley" Cc: linux-scsi@vger.kernel.org, linux-usb@vger.kernel.org On Mon, 2014-11-03 at 16:06 -0500, Dale R. Worley wrote: > Was there any resolution as to how large disk drives would be handled > if their interface did not support the "capacity" request that would > tell how large they were? Realistically no ... unless someone comes up with a reliable heuristic to give us the size. > Or as an alternative, is there any way to avoid buying USB-SCSI > interfaces that do not support the large-capacity request? > Unfortunately, such devices work OK with Windows (since Windows trusts > what the partition table says), you can't just say to the salesperson > "It has to work on drives over 3 TB." This is a stopgap: your 3TB drive can be guessed as the 16 bit capacity plus 2TB, but the same won't happen for a 5TB device. Believing the partition table gives us a chicken and egg problem because something still has to get the partition table on to the device. I don't think "don't buy something that doesn't work" is a hugely unreasonable response to this. James > Dale > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >