Read/Write disk at fisical level

[Robotex]

Hi. I'm developing OS, but I have one problem. How can I read and write disks (hdd, fdd & usb flash drive) in protected mode?

Best regards, Nick.

[AJ]

Hi,

Unlike with BIOS calls in Real Mode, there is no single interface for these devices - you need to write drivers for PATA, SATA, the FDC and USB individually. Have a look at our wiki article for Storage to get started.

Of these devices, PATA is probably the easiest to get started with.

Cheers,
Adam

[Robotex]

If I will realize PATA, will it work with SATA HDD? Or only IDE?

[djmauretto]

certainly with some measure

[Laksen]

SATA controllers usually have shadow registers meaning that it emulates the ATA protocol as far as I'm aware

[Troy Martin]

Floppy Disk Controller

TLDR version:

[The] Floppy controller is programmed through 8 registers accessed from 0x3F0 through 0x3F7 I/O ports. As usual on PC architecture, some of those registers have different meaning depending on whether you read or write them. For extra info, refer to the datasheet (see link below). Note that snippets and datasheets name those registers from their trigrams (e.g. SRA, MSR, DIR, CCR, etc)

[Love4Boobies]

Instead, you might want to look for ATA/ATAPI specs here: http://www.t13.org/
Think of it as an interface that kinda' works for everything.

[Robotex]

Can you get me a direct link?

[Brynet-Inc]

People are so helpless... I swear this has been posted on the forum before.

http://en.wikipedia.org/wiki/Advanced_T ... d_features