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

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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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.dubbs@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
>
>
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-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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