From mboxrd@z Thu Jan 1 00:00:00 1970 From: Goswin von Brederlow Subject: Re: Adding a smaller drive Date: Mon, 29 Jun 2009 12:07:17 +0200 Message-ID: <87eit31hgq.fsf@frosties.localdomain> References: <20090628194705152.ITZI24524@cdptpa-omta02.mail.rr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: (Martin K. Petersen's message of "Sun, 28 Jun 2009 17:33:47 -0400") Sender: linux-raid-owner@vger.kernel.org To: "Martin K. Petersen" Cc: lrhorer@satx.rr.com, linux-raid@vger.kernel.org List-Id: linux-raid.ids "Martin K. Petersen" writes: >>>>>> "Leslie" == Leslie Rhorer writes: > > Leslie> I may have to rethink my position on using raw drives. If I > Leslie> partition the drives, I can make the partition a bit smaller > Leslie> than the whole drive, allowing for the addition of a future > Leslie> drive whose size is a bit off. I hate to waste space, but being > Leslie> stuck with an undersized or limping array is worse. > > This is not nearly as big a problem as it used to be. Drive > manufacturers need to adhere to an IDEMA standard which requires them to > use a specific LBA count for each capacity class. > > I.e. a 500GB Seagate drive must have exactly the same number of sectors > as a 500GB Western Digital or Hitachi. > > The IDEMA LBA standard applies to 3.5" form factor drives over 160GB as > well as 2.5" FF drives over 80 GB. Is that realy exactly so many LBA sectors or at least as many? I don't really see anything wrong with a 500G drive having a few more sectors. And I know my Maxtor 200G disk is 3G bigger than Seagates. MfG Goswin