From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tudor Holton Subject: Aren't 2TB+ disk sizes supposed to be standardized? Date: Fri, 05 Jul 2013 15:19:52 +1000 Message-ID: <51D65778.9010502@smartguide.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid List-Id: linux-raid.ids Hi guys, I just discovered this when I was about to do a disk transfer: [edited for brevity] $ sudo fdisk -l Disk /dev/sdc: 2000.4 GB, 2000397852160 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907027055 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00027892 Disk /dev/sdd: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 $ sudo smartctl -a /dev/sdc Model Family: Seagate Barracuda (SATA 3Gb/s, 4K Sectors) Device Model: ST2000DM001-1CH164 Firmware Version: CC43 User Capacity: 2,000,397,852,160 bytes [2.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical ATA Version is: 8 ATA Standard is: ATA-8-ACS revision 4 $ sudo smartctl -a /dev/sdd Model Family: Seagate Barracuda LP Device Model: ST32000542AS Firmware Version: CC34 User Capacity: 2,000,398,934,016 bytes [2.00 TB] Sector Size: 512 bytes logical/physical ATA Version is: 8 ATA Standard is: ATA-8-ACS revision 4 These are from the same manufacturer! Interestingly, the larger drive is actually the older one! Is the "standardization" not a fixed value but a minimum? If so, what is that actual minimum? If it's an actual 2 terabyte (2x10^12), then I suppose they're both technically over, but that means that we can't just simply create partitions that fill the space and expect to be able to transfer them later. :-( Cheers, Tudor.