ATA read/write sectors: Difference between revisions

=ATA read sectors=

 

Accessing disk using CHS (cylinder,head,sector) indexes seem to be kinda old type but is the base for LBA access. The following NASM subroutine reads CH sectors to memory address indicated by RDI register.

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=ATA write sectors=

 

As noted by Dex (aka 'qark') in this [http://forum.osdev.org/viewtopic.php?f=1&t=12268 forum topic], the only difference to ata_chs_read is 30h is sent to command register instead of 20h, and using OUTSW instead of INSW, and of course from [RSI] instead of [RDI]. So code for ata_chs_write can be obtained this way.

 

 

=See also=