Re: QESTION For Real Kernel Hackers. ATA IDENTIFY DATA & - NT/2K

“Maxim S. Shatskih” wrote:

> I shall simplify a question:
> I have only IDENTIFY DATA buffer. And i want to count up a
> HDD size. It is possible or not?

For LBA mode disks, UserAddressableSectors is the thing.
For CHS mode - C*H*S is the thing.
Use:

if( ( C == 16383 ) && ( H == 16 ) && ( S == 63 ) )

  • as a condition for a LBA-mode disk.

This is how NT4SPx works.

I have NT4SP6 and the following drives:

C2490 H16 S63
UserAddressableSectors 2511840

  • 1.2GB disk (it is in CHS mode) - and:

C16383 H16 S63
UserAddressableSectors 26688576

  • 13GB disk in LBA mode - not listed in the BIOS at all.

Note that all disks larger then 8GB will have C16383 H16 S63.

And i can’t to count up disk size, if disk larger then 8GB?

Dmitry.


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