-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 01/02/2014 05:56 PM, Carsten Aulbert wrote: > Why would one need to align to 4k if the on disk layout would be > 512bytes? > > Or did I miss something? Because they are providing 512 byte sector emulation on top of 4k physical sectors. If they were pure 4k sectors, there would be no need for special alignment. I believe that all WD drives do this, but I've seen a few people report that some seagate drives skip the 512 emulation. For that matter I have a first generation WD "Green" AF drive that I am retiring because it has been throwing uncorrectable errors but not reallocating on write, and often having no problem reading those sectors later. That drive isn't even nice enough to report that its really using 4k physical sectors ( despite my requests for them to fix this firmware bug, they never released an updated firmware ), though my new blue drives do at least indicate they are 4k physical. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCgAGBQJSxgInAAoJEI5FoCIzSKrwW1kH/2+2rdIm3ZE4TB2eyjDP3HQO OGHlr+BhIPIrATeEjZA+7EnTog8Xk36Pis4zPrCWUGZ5rVjVQnMR0lWmoeOGGjyR xAcX/g60ia1sqKUQaTmGevzRYfIycglW3wALSTu0mm2i6EaGm4BSl+cZruPAKPxl iBoNKyagIQccWtKxLH+6tCPpCqFRDnXg3PFQ0+K49CxUoh9Nb1Sk1FkPEjuMz5YF zENlt1WHNaG4ZcKtgLVAZZLDnjt3kdFxDwOWNIU/CEr2qUQ3hXyaSAp9b/MjeBfb 9S+PdjB67ZEBOLPY0CUA4Im/ixu/B4AT91uCVRL69yqasW3i4jX6St2UjdcPkDw= =U9uU -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
