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.
--S
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