There are a couple of places in the data returned from Identify device where
the max LBA is indicated. One of them is a legacy value, and the other one
is the right one. In the ATAPI 5 R3 spec, you can find the table that
documents this on pages 89 & 90 as the pages are numbered, 103 & 104
absolute in the PDF. Other versions of the spec will probably have
different page numbers, but the information should be there.
Phil
* Philip D. Barila | (503) 264-8386
* Intel Corp. | M/S JF2-53 Office JF2-2-G6
* Storage Architecture and Performance
* Internet Systems Lab
-----Original Message-----
From: D. K. [mailto:xxxxx@homepage.ru]
Sent: Thursday, March 29, 2001 1:21 AM
To: NT Developers Interest List
Subject: [ntdev] QESTION For Real Kernel Hackers. ATA IDENTIFY DATA & NT/2K
Hi, dear all!
I have written the device driver which reads
the ATA Identify Device Data through ports(on Windows NT/2k).
I have looked as my FreeBSD 4.2 determines real size HDD in
her ATA dev(ice) driver at boot time:
==cut here==
total_secs = cylinders * heads * sectors;
if (cylinders == 16383 && total_secs < lbasize)
total_secs = lbasize;
==cut here==
Where: ATA offset ATA description
cylinders - // 1 number of fixed cyls
heads - // 3 number of heads
sectors - // 4 bytes/track
lbasize - // 60 total number of user addressable sectors (LBA
mode)
At booting FreeBSD correctly determines HDD size.
For my 15GB HDD lbasize(at boot time)= 30021632
But! When i read lbasize at Windows NT(SP6a)/ Windows 2000
it always = 0x70000 ~ 224 MB.
On any HDD…
Why?
Best Reards,
Dmitry Koptelov
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