Alex Buell wrote:
> On Thu, 27 Mar 2008 20:35:46 -0800, I waved a wand and this message
> magically appears in front of Doors:
>
>>> Ok, now that I fixed my utility, it does now show the DPB for the
>>> 0x13 / AH = 0x48 extensions. Unfortunately I'm 100% sure the SIL3114
>>> BIOS is wrong. It's still re****ting the wrong parameters.
>> Did you check the flag for maxed CHS values?
>>
>> If it is set then everything will be max for CHS which is 8Gb.
>
> Do you mean bit 6 of the int 0x13 / AH = 0x48 extensions information
> flag?
In the past, from the early nineties, I had a lot of interest in the
IDE/ATA harddisk specifications.
All specs can be found on Internet like at http://www.t13.org/
I forgot a lot getting older in the mean time but when glancing over the
messages in this newsgroup I think you maybe trying to find something
that isn't there anymore.
All relevant info about the disk is stored on the disk itself and can be
obtained by executing the ATA Identify Device command and reading the
infobytes.
Int 13h is something of the far past apart from reading the first 8GB.
Below part of a quite old discussion about harddisk size limits I found
on Internet.
<QUOTE>
Hard drives over 8.4 GB are supposed to re****t their geometry as
16383/16/63.
This in effect means that the `geometry' is obsolete, and the total disk
size can no longer be computed from the geometry, but is found in the
LBA capacity field returned by the IDENTIFY command.
Hard drives over 137.4 GB are supposed to re****t an LBA capacity of
0xfffffff = 268435455 sectors (137438952960 bytes).
Now the actual disk size is found in the new 48-capacity field.
</QUOTE>
Below some output in Dos from small assembler programs I made at the
time to study ATA, running on my old computer I use.
AMD Athlon XP 2400+, MSI-6330 K7T Turbo2, 1GB Ram
Output from IDEDEV.com:
Master ****t: 01F0h
Model: HDS728080PLAT20 SN: PFD210S2RZBBPE
Rev: PF2OA2AA LBA Capacity: 76.69GB
CHS Default: 16383 * 16 * 63 = 8063.0MB
Master ****t: 0170h
Model: IOMEGAZIP 100 ATAPI SN:
Rev: 14.A
Slave ****t: 0170h
Model: CREATIVEDVD-ROM DVD1242E SN:
Rev: BC101
Output from CHK13EXT.com:
INT13H Fixed Disk Extensions Available EDD-1.1
If I'm wrong in thinking what you are trying, sorry!
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