LBA->CHS

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ollesga

Joined: 01 Aug 2010
Posts: 1

ollesga 11 May 2012, 07:50

Hello. I'm trying to create a bootsector and it all went well until I saw that the sector number i wanted to load from disk was greater than 63 (using int 0x13, ah 2).

It seems like i need to convert LBA to CHS. I can't really find an answer to what "LBA" is.

Is it sectors or something more complicated?

11 May 2012, 07:50

shutdownall

Joined: 02 Apr 2010
Posts: 517
Location: Munich

shutdownall 11 May 2012, 10:07

Look here:
http://en.wikipedia.org/wiki/Cylinder-head-sector#CHS_to_LBA_mapping
and here
http://en.wikipedia.org/wiki/Logical_Block_Addressing#CHS_conversion

11 May 2012, 10:07

egos

Joined: 10 Feb 2009
Posts: 144

egos 15 May 2012, 11:20

Look at my post here: CHS or LBA translation.

15 May 2012, 11:20

bubach

Joined: 17 Sep 2004
Posts: 341
Location: Trollhättan, Sweden

bubach 15 May 2012, 17:42

egos, any progress with that 1337 h4xx0r virus that was going to take over the world? Very Happy

Osdev.org PM from 0x3B0 wrote:

I HAVE RAGE OF YOU!!!
I HATE YOU!!!
I WANT AND I WILL CRASH YOUR HEAD WITH ONE PUNCH!!!
O BICHO VAI PEGAR PARA VOCÊ SE TU NÃO ME EXPLICAR COMO TRADUZIR DE LBA PARA CHS!!!!!

15 May 2012, 17:42

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