Seth Goldberg wrote: > > > Quoting Bruce Dubbs, who wrote the following on Thu, 24 Dec 2009: > >> Seth Goldberg wrote: >>> >>> >>> On Dec 23, 2009, at 9:37 PM, Bruce Dubbs <bruce.du...@gmail.com> wrote: >>> >>>> Seth Goldberg wrote: >>>> >>>>> While the BIOS call supports 48-bit LBA, the MBR partition table >>>>> is limited to 32-bit LBA addresses for partition dimensions. If >>>>> you partition the disk with a GPT partition table, those >>>>> limitations are removed, but GPT-partitioned disks aren't >>>>> supported by XP (at least). >>>> >>>> Excellent point, but doesn't that mean a BIOS that supports LBA >>>> (which as been around for many years) will support 2^18 TB? I >>>> think my arithmetic is correct, but please correct me if I >>>> misunderstand. >>>> >>> >>> Assuming a 512-byte sector size, the total number of bytes is 2^9 >>> * 2^48 = 2^57 = 2^27 TB. >> >> Hi Seth, >> >> I thought you just said the usual partition table only supported 32 >> bits: >> >> 2^9 * 2^32 = 2^41 bytes or 2 TiB, give or take a byte. :) >> >> 1K = 2^10 >> 1M = 2^20 >> 1G = 2^30 >> 1T = 2^40 >> >> I think 48 bits gives 2^17 TiB or 128 Pib (Petabytes). > > Woops :). I was calculating the total possible addressable, not the > total for the DOS partition table :). Yes, your calculation looks > right to me. > You assume that BIOS has no limitations other than ones defined by interfaces. It's a strong assumption and in practice BIOS may have other problems. GRUB2 supports direct ATA(PI) access but no AHCI yet > --S > > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > http://lists.gnu.org/mailman/listinfo/grub-devel >
-- Regards Vladimir 'φ-coder/phcoder' Serbinenko
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