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Re: How to install grub on fakeraid (raid 0) which spans 2 TB?


From: Bruce Dubbs
Subject: Re: How to install grub on fakeraid (raid 0) which spans 2 TB?
Date: Thu, 24 Dec 2009 00:39:07 -0600
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.16) Gecko/20080722 SeaMonkey/1.1.11

Seth Goldberg wrote:


On Dec 23, 2009, at 9:37 PM, Bruce Dubbs <address@hidden> 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).

  -- Bruce





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